ZXMW NR8250 (R4.2A) Product Description

ZXMW NR8250 Product Description Digital Microwave Transmission System R4.2A

ZXMW NR8250 Product Description

ZXMW NR8250 Product Description

© 2016 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE. Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.

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ZXMW NR8250 Product Description

TABLE OF CONTENTS

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1 1.1 1.2 1.3 1.3.1 1.3.2 1.3.3 1.4

Overview .......................................................................................................... 11 NR8000 Product Introduction ............................................................................. 11 Future Oriented NR8250 .................................................................................... 12 NR8250 System Introduction ............................................................................. 13 IDU .................................................................................................................... 13 ODU................................................................................................................... 14 Flexible ODU Mounting Methods ....................................................................... 15 Network Application ........................................................................................... 17

2 2.1 2.2 2.3 2.4 2.5 2.6 2.6.1 2.6.2 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.14.1 2.14.2 2.15 2.15.1 2.15.2 2.15.3 2.15.4 2.15.5 2.15.6 2.16 2.17 2.18 2.19

Functions and Features .................................................................................. 18 Unified Platform for Hybrid and Packet Microwave ............................................. 18 Circuit Emulation Service over Ethernet (CESoETH) ......................................... 19 High Performance Switching Capacity ............................................................... 20 Intelligent Cooling System.................................................................................. 21 Automatic Transmit Power Control (ATPC) ........................................................ 22 Adaptive Coding & Modulation (ACM) ................................................................ 22 Enhanced ACM .................................................................................................. 23 ACM with QoS ................................................................................................... 23 Flexible Radio Configuration .............................................................................. 24 IDU Cascading for Hub Solution ........................................................................ 25 Carrier Grade Ethernet Functionality .................................................................. 26 Load Balance ..................................................................................................... 29 Double Spectrum Efficiency: XPIC (CCDP)........................................................ 31 Header Compression ......................................................................................... 31 Ethernet QoS ..................................................................................................... 32 Ethernet OAM .................................................................................................... 33 Ethernet Link OAM............................................................................................. 33 Ethernet Service OAM ....................................................................................... 34 Security.............................................................................................................. 35 Radio Link Security Identification (Link Security ID) ........................................... 35 Access Control List (ACL) .................................................................................. 36 Broadcast Storm Control .................................................................................... 36 LMT Authorization .............................................................................................. 36 Radio Link Encryption ........................................................................................ 37 Other Security Features ..................................................................................... 37 High Accuracy Clock Supply and Synchronization ............................................. 37 Protection and Resilience .................................................................................. 38 Frequency Auto-scanning .................................................................................. 39 Intelligent License Control .................................................................................. 39

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ZXMW NR8250 Product Description

2.20 2.21 2.21.1 2.21.2

Link Capacity Pass-Through (LCPT) .................................................................. 41 Management and Maintenance .......................................................................... 42 Full Scale Management Solution........................................................................ 42 Easy Maintenance ............................................................................................. 43

3 3.1 3.2 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.3.8 3.3.9 3.3.10 3.3.11 3.3.12 3.3.13 3.3.14 3.3.15 3.3.16 3.3.17 3.3.18 3.3.19 3.3.20 3.3.21 3.3.22 3.3.23 3.3.24

Hardware Description ..................................................................................... 46 IDU Structure ..................................................................................................... 46 ODU Structure ................................................................................................... 49 Boards and Interfaces ........................................................................................ 50 RCUB ................................................................................................................ 50 RCUC/RCUC2 ................................................................................................... 52 RMUC ................................................................................................................ 53 RMUD ................................................................................................................ 54 RMUE ................................................................................................................ 55 RMUH ................................................................................................................ 56 RMUF ................................................................................................................ 57 RTUA (16×E1 (native)) ...................................................................................... 58 RTUD (16×E1 (native/CES)) .............................................................................. 59 RTUC (32×E1 (native)) ...................................................................................... 59 RTUB (1×STM-1 + 1×STM-1/4 + 8×E1 (native)) ................................................ 60 RTUE (2xSTM-1 (CES))..................................................................................... 61 RTUNO (2×GbE(O) + 2×GbE(O/E)) ................................................................... 61 RTUNE (2×GbE(E) + 2×GbE(E/O)).................................................................... 62 RTUHO (3×GbE(O) + 8×E1(native)) .................................................................. 63 RTUHE (3×GbE(E) + 8×E1(native)) ................................................................... 63 RTUNP (2×GbE(POE)) ...................................................................................... 64 RPEA (2×GbE(E) +2×GbE(POE)) ...................................................................... 64 RTUIO (1×10GbE(O)) ........................................................................................ 65 RSUA................................................................................................................. 66 PM ..................................................................................................................... 66 RPUA................................................................................................................. 67 RPUC ................................................................................................................ 68 RFAB ................................................................................................................. 69

4 4.1 4.2

NMS: Network Management System .............................................................. 70 Unified NMS Solution, Powerful Management .................................................... 70 Web-based LMT, Easy Maintenance ................................................................. 71

5 5.1 5.1.1 5.1.2

Configuration and Application ....................................................................... 73 NR8250 Typical Configurations.......................................................................... 73 1+0 Configuration .............................................................................................. 73 1+1 HSB Configuration ...................................................................................... 74

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ZXMW NR8250 Product Description

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5.1.3 5.1.4 5.1.5 5.1.6 5.1.7 5.1.8 5.1.9 5.2 5.2.1 5.2.2 5.3 5.3.1 5.3.2 5.3.3

1+1 SD Configuration......................................................................................... 75 1+1 FD Configuration ......................................................................................... 76 2+0 XPIC Configuration ..................................................................................... 77 2+2 XPIC HSB Configuration ............................................................................. 78 2+2 XPIC SD Configuration ............................................................................... 79 N+1 Configuration .............................................................................................. 80 Nodal Configuration ........................................................................................... 82 NR8250 with NR8950 Typical Configuration ...................................................... 83 PoE Condition (Power over Ethernet) ................................................................ 84 DC Power Condition .......................................................................................... 94 Application Scenarios ........................................................................................ 95 Tree Network ..................................................................................................... 95 Ring Network ..................................................................................................... 96 All-Packet Switching Application ........................................................................ 98

6 6.1 6.1.1 6.1.2 6.1.3 6.1.4 6.1.5 6.2 6.2.1 6.2.2 6.3 6.3.1 6.3.2 6.4 6.4.1 6.4.2 6.5

Performance and Parameters ....................................................................... 100 System Integrity ............................................................................................... 100 Mechanical Characteristics .............................................................................. 100 Operation Parameters ...................................................................................... 100 Standards Compliance ..................................................................................... 103 Fault Tolerance MTBF/MTTR........................................................................... 103 General Safety Requirements .......................................................................... 104 Physical Interfaces Performance...................................................................... 104 Service Interface .............................................................................................. 104 Management and Auxiliary Interface ................................................................ 106 Radio Performance .......................................................................................... 107 Transmitter Characteristics .............................................................................. 107 Receiver Characteristics .................................................................................. 114 System Capability ............................................................................................ 123 System Transmission Capacity ........................................................................ 123 Channel Spacing.............................................................................................. 130 Clock and Synchronization ............................................................................... 131

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Abbreviations ................................................................................................ 132

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ZXMW NR8250 Product Description

FIGURES Figure 1-1 NR8000 system general chart...........................................................................12 Figure 1-2 NR8250 (IDU) appearance ...............................................................................13 Figure 1-3 SRU appearance and interfaces .......................................................................14 Figure 1-4 HRU appearance and interfaces .......................................................................15 Figure 1-5 Direct mounting.................................................................................................16 Figure 1-6 Remote mounting .............................................................................................16 Figure 1-7 NR8000 series solution .....................................................................................17 Figure 2-1 Unified switching platform .................................................................................18 Figure 2-2 CESoETH application .......................................................................................19 Figure 2-3 Intelligent cooling system ..................................................................................21 Figure 2-4 ACM working scheme .......................................................................................23 Figure 2-5 TDM service cascading.....................................................................................25 Figure 2-6 Ethernet service cascading ...............................................................................26 Figure 2-7 Load balance application scenario ....................................................................30 Figure 2-8 XPIC description ...............................................................................................31 Figure 2-9 Full scale and hierarchical Ethernet OAM .........................................................33 Figure 2-10 Intelligent license control schematic ................................................................40 Figure 2-11 LCPT working scheme ....................................................................................42 Figure 2-12 Wi-Fi combo and smart phone ........................................................................44 Figure 2-13 USB Wi-Fi module ..........................................................................................45 Figure 3-1 Hardware layout................................................................................................46 Figure 3-2 IDU block diagram ............................................................................................49 Figure 3-3 ODU block diagram ..........................................................................................50 Figure 3-4 RCUB board front panel....................................................................................50 Figure 3-5 RCUC/RCUC2 board front panel ......................................................................52 Figure 3-6 RMUC board front panel ...................................................................................53 Figure 3-7 RMUD board front panel ...................................................................................54 Figure 3-8 RMUE board front panel ...................................................................................55

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ZXMW NR8250 Product Description

Figure 3-9 RMUH board front panel ...................................................................................56 Figure 3-10 RMUF board front panel .................................................................................57 Figure 3-11 RTUA board front panel ..................................................................................58 Figure 3-12 RTUD board front panel ..................................................................................59 Figure 3-13 RTUC board front panel ..................................................................................59 Figure 3-14 RTUB board front panel ..................................................................................60 Figure 3-15 RTUE board panel ..........................................................................................61 Figure 3-16 RTUNO board front panel ...............................................................................61 Figure 3-17 RTUNE board front panel ...............................................................................62 Figure 3-18 RTUHO board front panel ...............................................................................63 Figure 3-19 RTUHE board front panel ...............................................................................63 Figure 3-20 RTUNP board front panel ...............................................................................64 Figure 3-21 RPEA board front panel ..................................................................................64 Figure 3-22 RTUIO board front panel .................................................................................65 Figure 3-23 RSUA board front panel ..................................................................................66 Figure 3-24 PM board front panel ......................................................................................66 Figure 3-25 RPUA board front panel ..................................................................................67 Figure 3-26 RPUC board front panel..................................................................................68 Figure 3-27 RFAB board front panel ..................................................................................69 Figure 4-1 Network management solution..........................................................................70 Figure 5-1 1+0 configuration diagram ................................................................................74 Figure 5-2 1+1 HSB configuration diagram ........................................................................75 Figure 5-3 1+1 SD configuration diagram ..........................................................................76 Figure 5-4 1+1 FD configuration diagram ...........................................................................77 Figure 5-5 2+0 XPIC configuration diagram .......................................................................78 Figure 5-6 2+2 XPIC HSB configuration diagram ...............................................................79 Figure 5-7 2+2 XPIC SD configuration diagram .................................................................80 Figure 5-8 2+1 configuration diagram ................................................................................81 Figure 5-9 3+1 configuration diagram ................................................................................82 Figure 5-10 Nodal configuration diagram ...........................................................................83

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ZXMW NR8250 Product Description

Figure 5-11 1+0 configuration diagram ..............................................................................85 Figure 5-12 1+1 HSB configuration diagram ......................................................................86 Figure 5-13 1+1 SD configuration diagram.........................................................................87 Figure 5-14 1+1 FD configuration diagram .........................................................................88 Figure 5-15 2+0 XPIC configuration diagram .....................................................................89 Figure 5-16 2+2 XPIC HSB configuration diagram .............................................................91 Figure 5-17 2+2 XPIC SD configuration diagram ...............................................................92 Figure 5-18 Typical nodal configuration diagram (4× (1+0) + 4× (1+1) HSB) .....................93 Figure 5-19 1+1 HSB configuration diagram ......................................................................94 Figure 5-20 Tree network solution (hybrid) .........................................................................96 Figure 5-21 Single ring network solution ............................................................................97 Figure 5-22 Multiple ring network solution ..........................................................................97 Figure 5-23 All-Packet switching network scenario ............................................................99 Figure 5-24 CES for mixed network scenario .....................................................................99 Figure 6-1 Relation between RSL and output voltage @ RSSI interface ..........................123

TABLES Table 2-1 Switching capacity .............................................................................................20 Table 2-2 Radio configuration list .......................................................................................24 Table 2-3 Carrier grade Ethernet features..........................................................................26 Table 2-4 QoS features......................................................................................................32 Table 2-5 Ethernet service OAM ........................................................................................34 Table 2-6 Protection scheme .............................................................................................38 Table 2-7 Network management features ..........................................................................42 Table 3-1 Flexible configuration .........................................................................................47 Table 3-2 RCUB interface description ................................................................................50 Table 3-3 RCUC/RCUC2 interface description...................................................................52

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ZXMW NR8250 Product Description

Table 3-4 RMUC interface description ...............................................................................53 Table 3-5 RMUD interface description ...............................................................................54 Table 3-6 RMUE interface description ...............................................................................55 Table 3-7 RMUH interface description ...............................................................................56 Table 3-8 RMUF interface description ................................................................................57 Table 3-9 RTUA interface description ................................................................................59 Table 3-10 RTUD interface description ..............................................................................59 Table 3-11 RTUC interface description ..............................................................................60 Table 3-12 RTUB interface description ..............................................................................60 Table 3-13 RTUE interfaces description.............................................................................61 Table 3-14 RTUNO interface description ...........................................................................61 Table 3-15 RTUNE interface description ............................................................................62 Table 3-16 RTUHO interface description ...........................................................................63 Table 3-17 RTUHE interface description ............................................................................63 Table 3-18 RTUNP interface description ............................................................................64 Table 3-19 RPEA interface description ..............................................................................64 Table 3-20 RTUIO interface description .............................................................................65 Table 3-21 RSUA interface description ..............................................................................66 Table 3-22 PM interface description...................................................................................67 Table 3-23 RPUA interface description ..............................................................................67 Table 3-24 RPUC interface description ..............................................................................68 Table 5-1 NR8250 typical configurations............................................................................73 Table 5-2 1+0 configuration requirements per site .............................................................74 Table 5-3 1+1 HSB configuration requirements per site .....................................................75 Table 5-4 1+1 SD configuration requirements per site .......................................................76 Table 5-5 1+1 FD configuration requirements per site .......................................................77 Table 5-6 2+0 XPIC configuration requirements per site ....................................................78 Table 5-7 2+2 XPIC HSB configuration requirements per site ............................................79 Table 5-8 2+2 XPIC SD configuration requirements per site ..............................................80 Table 5-9 2+1 protection configuration requirements per site .............................................81

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ZXMW NR8250 Product Description

Table 5-10 3+1 protection configuration requirements per site ...........................................82 Table 5-11 Nodal configuration requirements (2 × (1+0) + 2 × (1+1) HSB) ........................83 Table 5-12 NR8250 with NR8950 ......................................................................................84 Table 5-13 1+0 configuration requirements per site ...........................................................85 Table 5-14 1+1 HSB configuration requirements per site ...................................................86 Table 5-15 1+1 SD configuration requirements per site .....................................................87 Table 5-16 1+1 FD configuration requirements per site......................................................88 Table 5-17 2+0 XPIC configuration requirements per site ..................................................89 Table 5-18 2+2 XPIC HSB configuration requirements per site ..........................................91 Table 5-19 2+2 XPIC SD configuration requirements per site ............................................92 Table 5-20 Nodal configuration requirements (4× (1+0) + 4× (1+1) HSB) ..........................93 Table 5-21 1+1 HSB configuration requirements per site ...................................................94 Table 6-1 Dimension and weight ......................................................................................100 Table 6-2 Power supply ...................................................................................................100 Table 6-3 Temperature and humidity ...............................................................................100 Table 6-4 Module power consumption .............................................................................101 Table 6-5 System power consumption per site (SRU) ......................................................102 Table 6-6 Complied standards .........................................................................................103 Table 6-7 Predicted reliability ...........................................................................................104 Table 6-8 Service interface characteristics .......................................................................104 Table 6-9 Management and auxiliary interface characteristics .........................................106 Table 6-10 Frequency adjustment step and stability ........................................................107 Table 6-11 Tx/Rx spacing: SRU .......................................................................................108 Table 6-12 Tx/Rx spacing: HRU ......................................................................................109 Table 6-13 IF interface standard ......................................................................................110 Table 6-14 Transmitter power - Part 1: SRU (6 GHz ~15 GHz) ........................................111 Table 6-15 Transmit power & ATPC range - Part 2: SRU (18 GHz ~42 GHz) ..................112 Table 6-16 Transmit power & ATPC range: HRU .............................................................113 Table 6-17 RSL threshold @ BER=10-6: SRU with RMUC/RMUD/RMUE ........................114 Table 6-18 RSL threshold @ BER=10-6: SRU with RMUH ...............................................116

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ZXMW NR8250 Product Description

Table 6-19 RSL threshold @ BER=10-6: SRU with RMUF ...............................................118 Table 6-20 RSL threshold @ BER=10-6: HRU with RMUC/RMUD/RMUE ........................120 Table 6-21 RSL threshold @ BER=10-6: HRU with RMUH .............................................121 Table 6-22 RSL threshold @ BER=10-6: HRU with RMUF ...............................................122 Table 6-23 Typical system transmission capacity: RMUC/RMUD/RMUE .........................124 Table 6-24 Typical system transmission capacity: RMUH ................................................125 Table 6-25 Typical system transmission capacity: RMUF ................................................127 Table 6-26 Synchronization features................................................................................131

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ZXMW NR8250 Product Description

1

Overview ZTE NR8000 R4.2A (Released version 4.2A) digital microwave transmission system is introduced in this document. NR8250 nodal equipment, as one model of NR8000 portfolio, is described in detail. NR8250 handles hybrid transmission for native TDM & Ethernet; with the same platform, NR8250 also can handle Ethernet packet or MPLS packet transmission that means it is perfect for migration from hybrid to all packets. Furthermore, NR8250 employs a range of techniques to offer the high throughput, Ethernet QoS and E2E OAM to serve as you need. (Notes: IP MPLS/MPLS-TP is hardware prepared in this version; software will be released in future. )

1.1

NR8000 Product Introduction ZTE’s radio system NR8000 is a packet-based solution to offer carrier grade Ethernet transmission where the packet based traffic is predominant, giving consideration to support the still present TDM traffic. NR8000 represents the capability to allow smooth migration from the hybrid platform to the packet platform in the Mobile Backhauling networks. 

NR8000 portfolio has released 7 models - NR8120, NR8120A, NR8120D, NR8150, NR8250, NR8950 and NR8000TR:



NR8120A/NR8120D is the enhanced hardware version of NR8120. Comparing with NR8120, some features are new added: HQoS, XPIC, 512 to 2048QAM, hardware architecture prepared for 4096QAM/MPLS/STM-1. NR8120A/D also provides much more traffic interfaces than NR8120. NR8120A provides 1 radio direction while NR8120D provides 2 radio directions.



NR8150 is a 1U height box which can support maximum 3 radio directions, which is usually used at terminal, repeater or hub site. When NR8150 IDU combining with NR8950, which can provide max. 12 radio directions and support the modulation range from QPSK to 2048 QAM.



NR8250 is a 2U height box that supports maximum 6 radio directions or 7 traffic cards to provide nodal solution. When NR8250 IDU combining with NR8950, which

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ZXMW NR8250 Product Description

can provide max. 20 radio directions and support the modulation range from QPSK to 2048 QAM. 

NR8950 is all outdoor microwave radio to provide all-packet transmission solution for mobile backhaul and private network.



NR8000TR consists of three basic units, IDU, ODU and OCU (Outdoor Coupling Unit). It supports multiple configurations, such as 6+0, 7+1, 8+0 XPIC to fulfill more scenarios, trunk, backbone transmission and so on.



NR8120, NR8120A, NR8120D, NR8150 and NR8250 share the universal outdoor parts, including ODU, waveguide and antenna. Furthermore, NR8250 and NR8150 share some of the traffic interface boards and core control units.

Figure 1-1

1.2

NR8000 system general chart

Future Oriented NR8250 NR8250, the 2U height equipment, provides 8 configurable slots that support hot-swapping boards and support up to 6 Radio directions; two NR8250 IDUs can be connected together via cascade interface to provide max. 12 radio directions, NR8250

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ZXMW NR8250 Product Description

IDU combines with NR8950 to provide max. 12 radio directions via PoE or max. 20 directions via direct -48 VDC power supply. With the growth of data traffic, a high bandwidth microwave transmission system is needed in the backhaul as well as private network. ZTE released its high capacity and nodal solution to fit the developmental requirements with carrier grade and packet based microwave equipment—NR8250. NR8250 can transmit single or mixed native TDM, emulated TDM and packet service at the same time that means one NR8250 IDU can be used as both hybrid radio for TDM&IP network and packet radio for all-IP (Enhanced ETH or MPLS) network with suitable service boards and software configuration. It’s perfect for a hybrid network to all-packet migration.

1.3

NR8250 System Introduction The NR8250 microwave system includes indoor unit (IDU) and outdoor unit (ODU). The ODU is a waterproof unit and can be mounted on antenna in direct or remote way.

1.3.1

IDU NR8250 indoor unit (IDU) provides core control, baseband processing, switching/cross connection and service access function. As an entire system, it is connected with an outdoor radio unit (ODU) via an intermediate frequency (IF) cable.

Figure 1-2

NR8250 (IDU) appearance

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ZXMW NR8250 Product Description

1.3.2

ODU ODU is the outdoor unit of the NR8000 series. It delivers power amplification and radio frequency (RF) conversion functions There are two types of ODU - SRU and HRU: 

SRU: Normal transmit power ODU, operates in the frequency range of 6-42 GHz (6/7/8/10/11/13/15/18/23/26/28/32/38/42 GHz), support QPSK to 2048 QAM



[Note]

.

HRU: High transmit power ODU, operates in 6/7/8/11 GHz, support QPSK to 1024 QAM.

There are three important interfaces on the ODU: 

RF in/out interface (waveguide type) for connecting to antenna.



IF in/out interface (N type) for connecting to modem board.



RSSI (Received Signal Strength Indication) interface (BNC type) for RF receiver signal monitoring.

Figure 1-3

SRU appearance and interfaces

RF in/out

RSSI

IF in/out

Notes: SRU for QPSK -1024QAM ODU and QPSK-2048QAM ODU are different.

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ZXMW NR8250 Product Description

Figure 1-4

HRU appearance and interfaces

RF in/out

RSSI

1.3.3

IF in/out

Flexible ODU Mounting Methods The ODU has two mounting methods: direct mounting and remote mounting. All the frequency sub-bands support these two mounting methods. Mounting suggestions are described as following: 

Direct mounting is suggested for single-polarized antenna: 

For 1+0 configuration, the ODU is directly connected on antenna.



For 1+1 configuration, a combiner is used to connect the 2 ODUs together and then connected on the antenna.



For 2+0 configuration, if the 2 ODUs’ frequencies are covered by the same combiner, they might adopt direct mounting; otherwise, they should adopt remote mounting.



For 2+0 XPIC configuration, ZTE provides direct mounting method benefit of OMT module. Compared with traditional remote mounting method, the wave-guide is saved and the water-proof effect is enhanced.



Remote mounting is usually used for dual-polarized antenna or big-size antenna. In this situation, waveguides are used to connect ODUs to antenna.

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ZXMW NR8250 Product Description

Figure 1-5

Direct mounting 1+1/2+0 configuration

1+0 configuration

Combiner Single-polarized Antenna

Single-polarized Antenna

ODUs

ODU

2+0 XPIC configuration OMT Circle-polarized Antenna

ODUs

Figure 1-6

Remote mounting 1+1/2+0 configuration

1+0 configuration

Single-polarized Antenna

waveguide

Single-polarized Antenna

waveguide

ODUs

ODU

Combiner

2+0 XPIC configuration

Dual-polarized Antenna

ODUs

Waveguide

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ZXMW NR8250 Product Description

1.4

Network Application NR8250 is mainly used as aggregation node of TDM, hybrid and packet backhaul network, which provides nodal transmission solution for high capacity transmission.

Figure 1-7

NR8000 series solution Microwave Backhaul

FE

E1

GE eNodeB

NR8950

STM-1

BSC

E1 FE

FE

NodeB

RNC

GE E1 BTS

NR8120/ NR8120A

NR8120D/ NR8150

NR8250/ NR8000 TR

aGW

By providing multi-service access boards and carrier grade Ethernet function, NR8250 can be used in different scenarios: 

Predominant hybrid backhaul network With dual switching panel design, hybrid & native transmission architecture, versatile TDM and IP interface cards, NR8250 can meet the requirements of hybrid backhaul adequately.



All-packet mobile backhaul network NR8250 provides TDM circuit emulation and L2 switching function for 3G & LTE networks.



All-IP Enterprise networks, fixed broadband last mile access and other applications.



NR8250 combining with NR8950 can be deployed in aggregation site.

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ZXMW NR8250 Product Description

2

Functions and Features The main functions and features of NR8250 R4.2A are described in this chapter.

2.1

Unified Platform for Hybrid and Packet Microwave One NR8250 unit can be used as hybrid and packet radio (enhanced ETH or MPLS), which can transmit pure or mixed native TDM, emulated TDM, native Ethernet and MPLS service at the same time. With the MPLS based hardware & software, NR8250 will process IP MPLS or MPLS-TP service. Recently, both hardware & software are released for enhanced ETH; MPLS is hardware ready. NR8250 can transmit native TDM, emulated TDM and native Ethernet service over the same radio link. It is always possible to migrate from the Hybrid radio to the Packet radio by applying the proper software, hardware and upgrading the license accordingly. Both hybrid and packet radio can be supported by the same unit.

Figure 2-1

Unified switching platform

Radio Link Dynamic Allocation

Native ETH CES TDM

Native TDM

CES

ETH Switch Modem

TDM DXC

Ethernet (native)

Ethernet (CES E1 ) TDM

The advantages of unified switching platform include:

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

Smooth migration from TDM to packet, saving CAPEX.



Flexible network for different requirements, easy deployment.

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ZXMW NR8250 Product Description

2.2

Circuit Emulation Service over Ethernet (CESoETH) CESoETH (Circuit Emulation Service over Ethernet) is a kind of circuit emulation technique to carry TDM service over packet switching network (PSN). It is defined by MEF3 & MEF8 for implementing interoperable CES equipment that reliably transport TDM circuits across Metro Ethernet Networks while meeting the required performance of circuit emulated TDM services as defined in ITU-T and ANSI TDM standards. Some standards adopt a kind of similar technique - PWE (Pseudo Wire Emulation) to achieve TDM over PSN. From the perspective of the target, CES and PWE are the same. As shown in Figure 2-2, CES processing unit (NR8250 IDU) emulate the TDM circuit at local end and re-creating the TDM circuit at far end.

Figure 2-2

CESoETH application NR8250

NR8250

TDM Equipment

TDM Equipment/Network

Ethernet

TDM CES

Ethernet switching

Ethernet Ethernet CES switching

Carrier Ethernet NNI

TDM

NNI

E2E CES E2E EVC

Bearing channel （QinQ Link）

CES: Circuit Emulation Service IWF: Inter-Working Function

NR8250 allows the access equipment to smoothly evolve in line with the new technology and related protocols (TDM/Ethernet) without site swapping, which keeps the value of the contributed investments. NR8250 supports Structure-Agnostic Emulation (be equal to SAToP (RFC4553)) and Structure-Aware Emulation (be equal to CESoPSN (RFC5086)) for G.704 defined E1 and G.707 defined ch.STM-1 (channelized STM-1) service: 

Structure-Aware Emulation (Structured E1 CES)

Structured CES strips off the TDM overhead and just passes the payloads. It allows for more efficient use of MEN bandwidth, fewer circuits, and better network aggregation. Furthermore, structured CES realizes N*64kbit/s timeslot compression for E1 traffic. This

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ZXMW NR8250 Product Description

implementation agreement defines the structure-aware emulation of the TDM services using ―structure-locked‖，as described in [Y.1413]:





N×64kbit/s ―basic service‖



N×64kbit/s service with Channel Associated Signaling (CAS)

Structure-Agnostic Emulation (Unstructured E1 CES)

Compared with structured CES, unstructured CES passes all traffic received. It's simpler in that the TDM overhead–including signaling, timing and fault detection (Alarms) are preserved and passed through end to end. This implementation agreement defines the structure-agnostic emulation of TDM services. The payload format is described in [Y.1413].

2.3

High Performance Switching Capacity NR8250 supports built-in ADM, L2 switching and TDM circuit emulation functions. The ADM function supports VC-12 (E1) and VC-4 (STM-1) timeslot cross-connect, which include E1 to STM-1, E1 from one STM-1 to another STM-1, and STM-1 to STM-4. The service processing capacity of NR8250 is shown in Table 2-1.

Table 2-1

Switching capacity

Function Name

Capacity

Non-blocking

RCUB: 22 Gbit/s

Ethernet Switching

RCUC/RCUC2: 64 Gbit/s

Comments Full duplex

RCUB: 4000×4000 E1s

VC-12 level

RCUC/RCUC2: 8000×8000 E1s TDM Cross-connect RCUB: 63×63 STM-1s

VC-4 level

RCUC/RCUC2: 128×128 STM-1s Service Circuit Emulation Capacity

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VC-12 level 378×VC-12 circuit emulation service

(1×STM-1=63×VC-12, 1×E1=1×VC-12)

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ZXMW NR8250 Product Description

2.4

Intelligent Cooling System An intelligent fan unit is adopted by NR8250 to reduce the OPEX and noise. The running speed of fan can be adjusted automatically according to the equipment’s temperature, which could reduce the power consumption in real time. The lower temperature it is, the less power it costs. Meanwhile, the noise caused by the running fan is reduced obviously. The relationship between boards’ temperature and fan’s power consumption is shown in Figure 2-3.

Figure 2-3

Intelligent cooling system

Power Consumption (W)

40 30

20 10 0 -20

0

20

40

55

70

75 Temperature (℃)

Compared with constant rate fan, ZTE’s intelligent cooling system has the following advantages: 

Low power consumption, the OPEX is reduced.



Low noise, a comfortable working environment is obtained.



Low running speed tendency, the FAN service life is increased.

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ZXMW NR8250 Product Description

2.5

Automatic Transmit Power Control (ATPC) ATPC is used to lower the RF transmit power when environmental conditions are good in order to reduce wireless interference. Under fading conditions the transmit power is automatically increased to compensate for far end signal loss and to ensure the link continues to meet the required receiver signal level. The 40 dB/s (system) and 90 dB/s (ODU) reaction speed can counteract the normal wireless link fading rate.

2.6

Adaptive Coding & Modulation (ACM) The NR8250 supports fixed modulation or Adaptive Coding and Modulation (ACM) mode in all frequencies and Channel Spacing (CS). In fixed modulation condition, the radio working status and capacity will not change unless the modulation is changed by manual. Once the signal quality degrading lower than receiver threshold, the link will break down and all the services are affected. ACM enables the radio capacity to change according to the link quality, which is a perfect way to supply additional best effort traffic under normal weather conditions. When extreme weather conditions, such as a storm, affect the transmission and receipt of data and voice over the wireless network, an ACM-enabled radio system automatically changes modulation according to MSE (Mean Square Error, that indicates the signal quality), which allows the high priority data (e.g. real time data) to continue to run uninterrupted. With ZTE’s solution, no bit errors are generated during the modulation change; it is designed for Carrier Grade networks.

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ZXMW NR8250 Product Description

Figure 2-4

ACM working scheme

2048QAM 1024QAM

Low Priority Payload

512QAM 256QAM 128QAM 64QAM 32QAM 16QAM

16QAM 32QAM QPSK

High Priority Payload

2.6.1

Enhanced ACM When planning ACM-based radio links, enhanced ACM allows the radio maintains the highest level modulation with the lowest transmit power (Tx power). Once fading accrued, NR8250 will increase the Tx power quickly in order to keep the high modulation. Once the Tx power achieves the maximal value of the current modulation, the modulation will degrade to lower level, meanwhile the allowed maximum transmit power will be increased to the maximal Tx power of current low modulation (the lower modulation is the higher max. TX power it has). When fading disappeared, NR8250 will regain the highest modulation firstly and then decrease the Tx power if the signal quality can meet the requirement of the highest modulation.

2.6.2

ACM with QoS Once ACM mechanism is activated, the NR8250’s QoS mechanism will ensure high priority services. For further information about Ethernet QoS functionality, please refer to chapter 2.13 Ethernet QoS. The advantages of ZTE’s ACM include: 

Maximized spectrum usage



Hitless and errorless modulation/coding changes based on signal quality. Carried grade modulation changing rate is 10 ms per step.

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ZXMW NR8250 Product Description



Adaptive maximum Tx power per modulation for maximal system gain per working point



An integrated QoS mechanism that enables intelligent congestion management to ensure that high priority traffic is not affected during link fading: 

Native STM-1 has higher priority than native E1, and native E1 has higher priority than Ethernet traffic. In addition, E1 or STM-1 channels can be also assigned with different priorities to enable differentiated E1 or STM-1 dropping during severe link degradation.



The priorities of emulated E1s or VC-12s of STM-1 can be defined by the Ethernet priorities of the emulated TDM.

2.7

Flexible Radio Configuration As nodal equipment, NR8250 supports maximum of 6 radio transmission directions and can be configured as 1+0 non-protection, 1+1 protection , N+1 protection and XPIC， supports NR8250 with NR8950 configuration.

Table 2-2

Radio configuration list Item

Max. Number of

Configuration Type 1+0

Configurations

1+0

6

1+1 HSB/SD/FD

3

N+1 (N≤3) protection

1

2+0 XPIC

3

4+0 XPIC

1

2+2 XPIC SD/HSB

1

1+0 Non-protection

20

3+0 with load balance

6

Protection

1+1 HSB/SD/FD

10

XPIC

2+0 XPIC

10

Non-protection Protection NR8250

XPIC

Non-protection NR8250 with NR8950

24

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ZXMW NR8250 Product Description

Item

Max. Number of

Configuration Type

Configurations

4+0 XPIC

5

2+2 XPIC HSB/ SD/FD

5

TIPS: Please refer to chapter 5 configuration and application for detail configuration description.

2.8

IDU Cascading for Hub Solution NR8250 offers IDU cascading (also can be called IDU extension) function to support more radio ways or more traffic interfaces. When two IDUs are used for cascading: 

The TDMEXT interface of RCUB board or any Ethernet interface (which is defined as TDM cascading interface by software) of traffic board can be used for TDM service interconnection.



Any Ethernet interface can be used for Ethernet interconnection.

The realization of IDU cascading is shown in Figure 2-5 and Figure 2-6.

Figure 2-5

TDM service cascading

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ZXMW NR8250 Product Description

Figure 2-6

Ethernet service cascading

Notes: 1.

Max. 2 IDUs can be connected for TDM traffic cascading via TDM extension interface

2.

More than 2 IDUs’ TDM service cascading is realized by TDM traffic cards (interconnection via STM-1/STM-4/E1 interface)

3.

More than 2 IDUs can be used for Ethernet cascading, which is the same as Lay 2 switchers’ interconnection (time delay/latency must be a consideration for multi-IDU cascading)

2.9

Carrier Grade Ethernet Functionality NR8250’s carrier Ethernet services are MEF referenced design, which provides the following Ethernet features.

Table 2-3

Carrier grade Ethernet features

Item

Standardized

Feature E-LINE ,E-LAN &

Comply with MEF6.1 & MEF10.2;

E-TREE

MEF 9 & MEF14 or CE2.0 certificated

Services CESoETH

26

Description

Comply with MEF 3, MEF8, ITU-T Y.1413, SAToP and CESoPSN

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ZXMW NR8250 Product Description

Item

Feature Bridge

Description IEEE 802.1p/ 802.1q/802.1ad; Support peer/tunnel/discard L2 control protocol

Maximum

MTU: 1522 bytes;

Transmit Unit

Jumbo frame: up to 9600 bytes Max number of supported MAC address: 16 K (RCUB), 32K (RCUC/RCUC2);

MAC Address Learning Capacity

MAC address learning enable/disable; MAC address learning mode: IVL/SVL; MAC address aging time: 1 to 1,048,575 s Support IEEE 802.1p/ 802.1q/802.1ad; Integrated non-blocking switch; 4K*4K VLAN IDs by QinQ;

Scalability VLAN

Selective QinQ (Add, delete and rewrite VLAN tags based on port /protocol/MAC) Support copy/remap inner VLAN tag priority to outer VLAN Supports port-based mirror function:

the

messages from input, output or both directions Port Mirroring

of observed interface are copied intact to the observing interface. It’s used for testing or maintenance the traffic without traffic interrupting.

QoS Flow Control Priority-based Flow Control Quality of

(PFC)

Service

Please refer to ―chapter 2.13 Ethernet QoS‖ Adjust the traffic rate according to the radio throughput capacity, comply with IEEE 802.3 x. Priority-based Flow Control, comply with 802.1Qbb. The PIS technology is going to classify the services into 2 ranks. The one with lower priority

Packet Intelligence

will be cut into fragments while the other high

Segment (PIS)

priority services will be transmitted directly. With PIS function, long time delay and jitter of high priority services could be avoided.

Reliability

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LAG/enhanced

802.3ad/802.1ax ;

LAG

Widely used for Ethernet line protection and air

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ZXMW NR8250 Product Description

Item

Feature

Description interface load balance; NR8250 Supports static (with LACP) and manual (without LACP) aggregation; Load balance is realized by XOR and hash algorithm: LAG - based on MAC address, IP address (IPv4/IPv6); Enhanced LAG - based on MAC address, IP address (IPv4/IPv6), MAC/MPLS/IP V4/IP V6 packet identification. Physical layer aggregation (PLA) is specially used for air interface aggregation and load balance;

PLA

PLA can divide the services into several channels but need no protocols, which brings high utilization of radio resources; PLA supports maximum 4+0 link bonding in

single IDU ITU G.8032v1 Ethernet single ring protection ERPS

switching; ITU G.8032v2 Ethernet multiple ring protection switching.

ELPS

Comply with ITU G.8031 Ethernet Linear Protection Switching. STP comply with IEEE 802.3d;

STP/RSTP/MSTP

RSTP comply with IEEE 802.3W; MSTP comply with IEEE 802.1s. Port blocking feature is possible to prevent forwarding of frames from a given ingress port to

Port Blocking

one or more egress ports. With port blocking, flows of leaves can be isolated to each other in a tree topology.

ETH OAM Service Management

End-to-End (E2E) Management

IEEE 802.3ah EFM; IEEE 802.1ag CFM, ITU-T Y.1731 ETH OAM E2E TDM trail provisioning, management and configuration; E2E Ethernet service provisioning, management

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ZXMW NR8250 Product Description

Item

Feature

Description and configuration; E2E CES configuration; E2E QoS configuration..

RMON

2.10

Comply with IETF RFC 2819 Remote network monitoring management information base.

Load Balance The NR8250 supports Ethernet traffic load balance and TDM traffic load balance: 

Ethernet traffic load balance is realized by Physical Layer Aggregation (PLA), Link Aggregation Group (LAG) and Enhanced LAG. 

PLA can send one Ethernet stream to far end through several radio channels, which is very useful for delivering large streams. It’s an intelligent way of increasing bandwidth utilization by adjusting the radio channels’ throughputs dynamically according to their forwarding efficiency.



LAG can realize multi-channel load balance by XOR and hash algorithm based on MAC address, IP address (IPv4/IPv6);



Enhanced LAG can deliver different streams into different radio channels according to XOR/hash algorithm based on MAC/IP address (IPv4/IPv6), port ID, VLAN ID, Ethernet type, MPLS label.

Notes: 1.

LAG/Enhanced LAG will send the same stream through the same radio channel except the channel is failed.

2.

Only one of the above techniques should be applied for the same aggregation group.

3.

The 802.3ad or 802.1ax standard specifies that all ports in a LAG must have the same data rate and must be configured as full duplex.



TDM traffic load balance is realized by built-in ADM function

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ZXMW NR8250 Product Description

With built-in ADM function, a single STM-4 or STM-1 traffic can be divided into several STM-1 or E1 traffics and then distributed into multi radio channels according to the radio bandwidth. 

Scenario

Multi-radio aggregation site is usually used to deliver several separate data streams, such as N×FE or N×STM-1. But it can be also used to deliver a single stream such as Gigabit Ethernet or STM-4. As shown in Figure 2-7, the Gigabit Ethernet is split into 4 streams with PLA function and then transmitted. At the receiver site, the 4 streams are recombined into one stream. The STM-4 is split into 4 STM-1s with built-in ADM function, and is jointed again in the right timing.

Figure 2-7

Load balance application scenario

Function highlights: 

Realize high throughput transmission with low capacity radio



Provide carried grade network within 50ms switching time for Ethernet and TDM service



PLA or LAG/enhanced LAG also provides Ethernet link protection to increase system reliability

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ZXMW NR8250 Product Description

2.11

Double Spectrum Efficiency: XPIC (CCDP) Co-Channel Dual Polarization (CCDP) with Cross Polarization Interference Canceller (XPIC) technology is one of the best ways to enhance spectral efficiency. With this function, one frequency source could be used as two carriers to double the throughput. A high performance dual-polarized antenna should be used to minimize the cross-polarization interference.

Figure 2-8

XPIC description Vertical

Freq 1

660Mbps

Horizontal

660Mbps

½ * Frequency source 2 * Capacity

56MHz@2048QAM

Common scenarios: 

ZTE’s XPIC could work alongside with ACM function and 1+1 protection scheme, which can deliver a wireless backhaul solution with enhanced availability, high reliability and high throughput.



PLA or LAG/enhanced LAG is usually used in XPIC radio link to achieve load balance and high throughput

2.12

Header Compression In order to improve the transmission efficiency and the throughput under the limited radio source, an encapsulation efficiency technology called Frame Header Compression is adopted by NR8250. This technology can compress the header fields of L2 to L4 packet, such us Ethernet packet on L2, IP packet on L3, UDP on L4. Besides that, this technology can also compress MPLS packet. The Ethernet throughput could be increased to 320% maximally (based on IPV6 data, L2 to L4 header compression). Notes: The actual increased throughput depends on the packet size and compression scheme.

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ZXMW NR8250 Product Description

2.13

Ethernet QoS The Quality of Service (QoS) indicates the performance of data stream over a network. It promises to provide end-to-end services of high quality for users by resolving network delay and congestion problems. In case of network overload or congestion, QoS ensures high priority traffics. The following features are supported:

Table 2-4

QoS features

Feature

Description Flow classification based on: ingress port, IPv4 ToS/DSCP, IPv6 TC, 802.1p C-VLAN Pbit/S-VLAN Pbit, 802.1q C-VLAN ID/S-VLAN ID, TCP/UDP source / destination port number,

Flow Classification

source/destination MAC address, source/destination IP address, Ethernet type and MPLS TC (EXP bits of MPLS). Mark DSCP (according to ACL classification) / Outer VLAN tag priority(according to queue mapping) CAR supports: single-rate three-color marker (RFC2697) and

Ingress Policy

two-rate three-color marker (RFC2698), both of them can work at color-blind and color-aware mode. CIR, PIR, CBS and PBS with 64kbit/s step size 8 CoS (class of service) via 8 priority queues: BE, AF1, AF2,

Queue Schedule

AF3, AF4, EF, CS6, and CS7. Schedule scheme: SP, WRR, DWRR, WFQ, SP+WRR, SP+DWRR. SP+WFQ

Egress Shaping

Queue or egress port based shaping at 64Kbps step size.

Congestion

Tail drop, RED (Random Early Detection) and WRED

Management

(Weighted Random Early Detection). Priority sequence: Native STM-1s > native E1s > Ethernet. E1 or STM-1 channels can be also assigned with different priorities to

Priorities of Different

enable differentiated E1 or STM-1 dropping during severe link

Services

degradation (when ACM is enabled). The priorities of CES E1s or VC-12s of ch.STM-1 are assigned by the Ethernet priorities of the emulated TDM service.

HQoS

32

HQoS is dedicated to offer user level services of

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ZXMW NR8250 Product Description

Feature

Description sophistication. It supports four layers of scheduling mechanism with totally 1000 queues, including business layer, user layer, user group layer and port layer, and it also supports export speed limit for each layer. Through different layers of scheduling mechanism, HQoS can realize delicacy service quality control.

2.14

Ethernet OAM IEEE 802.3ah complied Ethernet link OAM, IEEE 802.1ag and ITU-T Y.1731 complied Ethernet service OAM is supported by NR8250. As shown in Figure 2-9, they provide E2E and hierarchical Ethernet OAM for our customer’s network.

Figure 2-9

Full scale and hierarchical Ethernet OAM

Access

Aggregation

Metro Router CS

2+0 XPIC Ring Base Station RNC P2P OAM

P2P OAM

802.3ah ETH Line OAM E2E OAM (Aggregation)

E2E OAM (Metro) 802.1ag/Y.1731 ETH Service OAM

E2E OAM (Whole Microwave Network)

P2P: Point-to-Point E2E: End-to End

Maintenance association End Point

802.1ag/Y.1731 ETH Service OAM

Maintenance Association Intermediate Point

2.14.1 Ethernet Link OAM Ethernet Link OAM supports fault management on Ethernet links according to IEEE 802.3ah (also called ―EFM‖) and provides fault management and performance monitoring in the Metro Ethernet Network (MEN) access link. It is used in physical line connection scenario. Notes: Ethernet Link OAM is only supported for LAN interfaces.

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ZXMW NR8250 Product Description

The three main Ethernet Link OAM areas are supported: 1.

Link Performance Monitoring.

Link performance monitoring is used for event notification on error frames at both near and far end and is used on NEs in operation. The notifications are based on a threshold crossing within a specific time window. 2.

Failure Notification

Notices the Ethernet link failure to the far end that in OAM operation. 3.

Remote Loopback

Link OAM remote loopback can be used for fault localization and link performance testing on LAN interfaces.

2.14.2 Ethernet Service OAM IEEE 802.1ag (also called ―CFM") is a standard defined by IEEE. It defines protocols and practices for OAM (Operations, Administration, and Maintenance) for paths through 802.1 bridges and local area networks (LANs). IEEE 802.1ag is largely identical with ITU-T Recommendation Y.1731, which additionally addresses performance management. The main Ethernet service OAM areas are described below.

Table 2-5

Ethernet service OAM

Function

Description

Standard

Continuity check (CC) in MEN is used for the Ethernet fault CC

checking, which indicates the link status between two MEPs. CC period: 3.33 ms, 10 ms, 100 ms,1 s, 10 s, 1 min, 10 min. Loopback (LB) is used for fault confirmation and fault

LB

802.1ag

location. The loopback defined in IEEE 802.1ag is a kind of unicast loopback that brings no user service interruption

LT

34

Link Trace (LT) is used for fault location and route

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ZXMW NR8250 Product Description

Function

Description

Standard

discovery. When this function is enabled, the service route and failure point of the demand link is list Frame Loss Measurement (LM) is used to measure LM

Ethernet end-to-end frame lost ratio, which is lunched by the network manager. Both single side and double side LM is supported by the NR8250 Frame Delay Measurement (DM) is used for on-demand OAM to measure Ethernet end-to-end frame delay and

DM

frame delay variation. ZTE’s NR8250 supports one-way and two-way DM (Notes: One-way DM requires time synchronization of the NEs. Two-way DM is used for time delay test).

RDI

Remote Defect Indication (RDI) informs the remote MEP there is a fault occurred at local MEP. Alarm Indication Signal (AIS) suppresses alarms at the

AIS

Y.1731

client-layer MEPs after detecting a fault or an AIS condition at the server-layer MEP. Locked Signal (LCK) suppresses the alarms generated by

LCK

out-of-service management or testing. The MEPs which received LCK information will ignore the link failure caused by the testing Testing signal (TST) is used for Ethernet throughput and

TST

packet loss rate testing, including in-service or out-of-service testing.

R-APS

2.15

Ring-Automatic Protection Switching (R-APS) provides switching signal for G.8032 ring protection.

Security NR8250 can prevent unauthorized logins and operations, ensuring network, radio link and equipment management security.

2.15.1 Radio Link Security Identification (Link Security ID) Link Security Identification (link security ID) is used to avoid mismatch between two radio links. Two ends of a radio link with different radio link IDs will not communicate each other even if they have other proper configurations. It’s a good way of preventing

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ZXMW NR8250 Product Description

undesired link connection to improve network security, such as the third party malicious data interception. Alarms will be reported and the traffic will be interrupted once link ID differences between local and remote sites are detected.

2.15.2 Access Control List (ACL) Access Control List (ACL) can classify the ingress packets and implements white list and black list management to enhance the network security. White list can be created via setting ACL parameters to specify which kind of traffic that can be transferred per port. When a white list is enabled, only the frames in the white list are allowed; other traffic will be discarded. Black list can be created reversely.

2.15.3 Broadcast Storm Control Filters can be created per port to prevent broadcast and multicast storms. Individual filters are used for broadcast and multicast traffic. The limit is specified as fixed rate (frames per second). When the limit is reached, additional frames will be discarded until the frame rate is below the specified threshold. The storm control filters are list as below. 

Broadcast packet.



Multicast packet (IP multicast/MAC multicast).



Unknown single cast packet.

2.15.4 LMT Authorization Local Maintenance Terminal (LMT) authority is graded to 3 levels:

36

1.

Administrator

2.

Operator

3.

Browse User

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ZXMW NR8250 Product Description

Administrator has the highest authority and browse user is the lowest. The OMC could set different authorization for each kind user to ensure the management security. NR8250 will record and send the log and configure action to the EMS server.

2.15.5 Radio Link Encryption Radio link encryption function using AES algorithm to encrypt radio data, thus preventing the third parties unauthorized access to microwave transmission network. This function can effectively prevent transmit data to be illegally obtain or modify. Encryption algorithms include: 

Symmetric key algorithms: 128-bit AES



Symmetric key algorithms: 256-bit AES

2.15.6 Other Security Features More security features are supported shown as following:

2.16



Secure communication channels: SNMP V1 to V3, SSH, HTTPS and SFTP.



LMT account locking.



User account disable/enable.



RADIUS (Remote Authentication Dial-In User Service) authentication.

High Accuracy Clock Supply and Synchronization NR8250 supports diversified clock in/out options and provides the mainstream synchronization methods. The microwave system could synchronize from local crystal oscillator, radio frame and the external clock input. NR8250 could also distribute clock signal to other equipments (base station for instance). The main features include:

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ZXMW NR8250 Product Description



The clock accuracy complies with the ITU-T G.813 or ITU-T G.8263 standard, supporting three working modes: locking, maintaining, and free oscillation.



Extract clock from TDM interface, air interface, Ethernet interface, clock interface. (Notes: Clock accuracy of Sync from E1 complies with G.823.)



Provide BITS (2 Mbit/s / 2 MHz) and 1PPS+ToD clock input or output interfaces.



Network synchronization methods: Frequency synchronization (Sync over TDM, Sync. E, 1588v2 TC, BITS); Phase synchronization (1588v2 TC, Sync. E + 1588v2 OC/BC).

2.17



Supports SSM/expanded SSM protocol.



Supports priority-based multi clock source protection and 1588v2 BMC protection.



Clock holdover time is 24 hours at least.

Protection and Resilience NR8250 provides full-scale hardware and service protection scheme.

Table 2-6

Protection scheme

Item

Description

Control, Switching

The core control unit provides 1+1 hot standby for control,

and Clock

switching and clock input/output.

Power Supply

Both IDU and ODU power supply units support hot standby. 1+1 HSB/SD/FD. TDM N+1 Protection in radio link (N≤3).

Radio Link L1 (Physical layer) link aggregation (PLA) for multi-radio link. L2 link aggregation group (LAG/LACP) for multi- radio link. STP/RSTP/MSTP for ordinary Ethernet ring protection. Ethernet Service

ERPS complied with G.8032v1 and G.8032v2 for carrier Ethernet ring protection. ELPS complied with G.8031 for carrier Ethernet linear

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ZTE Confidential & Proprietary

ZXMW NR8250 Product Description

Item

Description protection. LAG offers redundancy connection for Ethernet line protection. Provides SDH (VC-4 level) wireless SNCP (Max. 2×STM-1s per channel).

TDM Service

Provides super PDH (VC-12 level) wireless SNCP (Max. 75×E1s per channel). MSP 1+1 for STM-1 line protection.

2.18

Frequency Auto-scanning Frequency scanning is a detection technique to help us to find out the interference by scanning receiver radio signal in the range of ODU’s frequency sub-band, and found a high quality microwave transmission link. The higher the receiver signal level is, the severer the interference will be. Frequency scanning is supported by NR8000 series products in range of 6 to 42 GHz. (Notes: When supporting frequency auto-scanning, the ODU model of NR8000 split-type equipments should be SRU/HRU.)

One can benefit from three aspects as follows: 

During site building, we can confirm whether there is adjacent station or overreach station interference in short time.



If the decline of transmission quality caused by poor signals during operation, maintainers can detect the interference frequency source accurately, and avoid interference by rearranging the frequency plan.



This function is realized by microwave equipment without any expensive frequency scanning instrument such as spectrum analyzer to save the operating cost.

2.19

Intelligent License Control All the functions of NR8000 are prepared once the hardware is deployed. Considering a step-by-step and low risk investment, some enhanced functions are controlled by software license. Thus, capital shortage and over investing are avoided.

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ZXMW NR8250 Product Description

In order to manage the license, standing on customer site, ZTE creates an industrial leading intelligent license management system, which is a kind of centralized and flexible license control solution with 3 typical features: 

Centralized license pool (License center).



Bulk import license.



Transferable license.

Figure 2-10

Intelligent license control schematic

License file can be imported to the license center (separated server or share EMS server) and act as license pool. After that, the on-line network elements (NEs) will request license from license pool (or release license to license pool) automatically according to link requirement. Manual setting is also supported. Intelligent license control brings:

40



Importing the license in bulk, save time.



License can be enabled automatically, easy maintenance.



License reusing, reduce CAPEX.



License transfer, easy site relocation.



Function adjustment, optimize network performance.

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ZXMW NR8250 Product Description

2.20 Link Capacity Pass-Through (LCPT) When microwave transmission capacity changes (such as ACM regulation or PLA/LAG switchover trigger capacity changes), traditional microwave will handle transmission services based on its own configuration, usually some low-priority services will be discarded. However NR8000 provide LCPT function, which Improve network utilization and network availability. LCPT is a new E2E technique, which can be used for ZTE microwave and wireless network interaction. NR8000 equipments will send LCPT messages (customized IEEE 802.3ah OAM packets) to downstream base stations when microwave radio capacity changes. Then the base station controller will send orders to the affected base stations to adjust the traffic rate. ZTE unique LCPT function enables the base station to sense the microwave radio capacity change timely: 

Microwave radio capacity reduction: the BSC will schedule the services flexibly and the downstream base station will reduce access services accordingly;



Microwave radio capacity increase: the downstream base station will be synchronized to improve access services based on users’ requirements.

Therefore, the services will be adjusted actively by the base station instead of being discarded by the microwave equipment passively.

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ZXMW NR8250 Product Description

Figure 2-11

LCPT working scheme

1

MW link capacity changes

Microwave

2

3

Send LCPT message

Receive & reported LCPT message BS Controller

Base Station 4

2.21

Notice the effected BS to adjust the service access rate

Management and Maintenance

2.21.1 Full Scale Management Solution ZTE offers powerful management system of NE (Networks element) level and Network level. The following features are used in network management:

Table 2-7

Network management features

Feature

Benefits

Provide one NMS interface;

Configurable DCN

Management (DCN) -

Any GbE interface can be

bandwidth: 64 Kbps to 5

Data Communication

configured as NMS interface for

Mbps. Management and

Network)

DCN cascading; DCN and traffic

traffic data share the

are isolated by VLAN tag.

wireless bandwidth

The EMS can discover

Network construction and

equipments and change network

management becomes

topology automatically.

intelligent and easily.

Static route configuration and

Improve the flexibility of

NE and Link Auto-discovery (LLDP)- Link Layer Discovery Protocol Route Management

42

Description

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ZXMW NR8250 Product Description

Feature

Description

Benefits

OSPFv2 based automatic route

network deployment and

management.

reduce the TCO. Monitoring the system

System Log

System log reporting feature

performance and locating the fault



Web-based Local Maintenance Terminal (LMT) offers a convenient and simply configuration method. It's an indispensable part when lack of EMS/NMS.



NetNumen™ U31, ZTE’s network management solution, provides simplified network provisioning, configuration error prevention, monitoring and troubleshooting tools that ensure better user experience, minimal network downtime and reduced expenditures on network level maintenance.

TIPS: For further information, please refer to ―chapter 4 NMS: Network management system‖ and ―NetNumen™ U31 Production Description‖.

2.21.2 Easy Maintenance E1 board, STM-1&STM-4 board and Ethernet traffic (optical and electrical) board are provided by NR8250, which can meet different transmission requirements via configuring different function boards. 1.

Flexible Slots Configuration All the function boards support flexible configuration that bring easy hardware addition or replacement:

2.

i.

Slots 1~2 are available for core control units

ii.

Slots 2~8 are available for traffic units

iii.

Slots 3~8 are available for modem units.

Hot-Swappable Boards The NR8250 provides admirable hot-swapping function. When the control board (with redundant configuration) or tributary unit board is broken, it can be replaced by

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ZXMW NR8250 Product Description

a new board without power off. Furthermore, the traffic will get right without reconfiguration if the board is replaced by a same type board and be installed into the same slot. During maintenance stage, the broken board will be swapped directly while the license is kept, which can simplify the maintenance process. 3.

Wi-Fi Access for Local Management Wi-Fi solution is widely used in wireless interconnection thanks to its cost saving deployment of local area networks (LANs). Specifically, spaces where cables cannot be run, such as outdoor areas, can host wireless LANs as a cost effective solution. ZTE Wi-Fi access solution is self-designed for easier and friendly system set-up and OAM of NR8000 series products. i.

Wi-Fi AP Combo & Smart Phone Wi-Fi Combo and Smart Phone are standard devices. Users can download and install the LMT app and follow the operation instruction easily. The LMT app is high scalability and friendly for operation, which is shown in Figure 2-12:

Figure 2-12 Wi-Fi combo and smart phone Wi-Fi AP & Mobile Battery Combo

Smart Terminal or PC: Phone, Pad, Laptop

ETH Cable

Wi-Fi NR8250 IDU

ii.

USB Wi-Fi Module USB Wi-Fi Module is another common Wi-Fi device which is applied on RCUC/RCUC2 board of NR8000 IDU. Instead of LAN cables connected IDU and Wi-Fi AP module, the USB Wi-Fi module is able to be inserted into the USB interface on RCUC/RCUC2 directly. Users can download and install the

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ZXMW NR8250 Product Description

LMT app and follow the operation instruction easily as well, which is shown in Figure 2-13:

Figure 2-13

USB Wi-Fi module

USB Wi-Fi Module Smart Terminal or PC: Phone, Pad, Laptop

Wi-Fi NR8250 IDU

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ZXMW NR8250 Product Description

3

Hardware Description The NR8250 adopts split-mount architecture, including indoor unit (IDU) and outdoor unit (ODU).

3.1

IDU Structure The NR8250 IDU comprises a subrack and series of boards. The subrack is 19 inches in width and 2U in height. The hardware layout is showed in Figure 3-1.

Figure 3-1

Hardware layout

NR8250 can meet different transmission requirements via configuring different function boards. All the function boards support flexible configuration and hot swapping. NR8250 IDU comprises 6 kinds of boards:

46



Radio Core Unit (RCU)



Radio Modem Unit (RMU)



Radio Traffic Unit (RTU)



Radio Assistant Service traffic Unit (RSU)



Power Module (PM) and Radio Power Unit (RPU)



Radio Fan Unit(RFA)

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ZXMW NR8250 Product Description

The relationship between the above boards and IDU’s slots is declared in Table 3-1.

Table 3-1

Flexible configuration

Board

Board

Type

Name

Description

Available slots

Radio Core Unit B: RCUB

1×NMS + 1×GbE + 1×TDMEXT + 1× LMT +

Slot 1 to 2

1×CLK IN/MON1 + 1×CLK OUT/MON2. RCU RCUC/ RCUC2

Radio Core Unit C: 1×NMS/GbE + 2×GbE + 1× LMT + 1×CLK

Slot 1 to 2

/MON+1×USB Radio Modem Unit C: single IF interface,

RMUC

supports XPIC function, QPSK/16 QAM/32

Slot 3 to 8

QAM/64 QAM/128 QAM/256 QAM. Radio Modem Unit D: single IF interface, RMUD

QPSK/16 QAM/32 QAM/64 QAM/128

Slot 3 to 8

QAM/256 QAM. Radio Modem Unit E: single IF interface, RMUE

QPSK/16 QAM/32 QAM/64 QAM/128

Slot 3 to 8

QAM/256 QAM.

RMU

Radio Modem Unit H: single IF interface, RMUH

supports XPIC function, QPSK/16 QAM/32 QAM/64 QAM/128 QAM/256 QAM/512

Slot 3 to 8

QAM/1024 QAM. Radio Modem Unit F: single IF interface, supports XPIC function, QPSK/16 QAM/32 RMUF

QAM/64 QAM/128 QAM/256 QAM/512

Slot 3 to 8

QAM/1024 QAM/1024 QAM light/2048 QAM. Hardware prepared for 4096 QAM. RTUA RTUB RTU

Radio Traffic Unit A: native 16×E1. Radio Traffic Unit B: native 1×STM-1(O) + 1×STM-1/4(O) + 8×E1.

Slot 2 to 8 Slot 2 to 8

RTUC

Radio Traffic Unit C: native 32×E1.

Slot 2 to 8

RTUD

Radio Traffic Unit D :native/CES 16×E1.

Slot 2 to 8

RTUE

Radio Traffic Unit E: CES 2×STM-1.

Slot 2 to 8

RTUNO

Radio Traffic Unit N (Optical):

Slot 2 to 8

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ZXMW NR8250 Product Description

Board

Board

Type

Name

Available

Description

slots

2×GbE(O) + 2×GbE(O/E). RTUNE RTUNP RPEA

RTUHO

RTUHE

RTUIO

RSU

RSUA

PM

PM3

RPUA RPU

Radio Traffic Unit N (Electrical):

Slot 2 to 8

2×GbE(E) + 2×GbE(O/E). Radio Traffic Unit P (Electrical): 2×GbE(PoE). Radio PoE Extension A:

Slot 3 to 8 Slot 3 to 8

2×GbE(E) +2×GbE(PoE). Radio Traffic Unit H (Optical):

Slot 2 to 8

3×GbE(O) + 8×E1 (native). Radio Traffic Unit H (Electrical):

Slot 2 to 8

3×GbE(E) + 8×E1 (native). Radio Traffic Unit I (optical):

Slot 2 to 4

10GbE(optical). Radio Assistant Service Traffic Unit A: 1×EDI + 2×SC + 1×EOW.

Slot 2 to 8

Power Module (supply power for IDU):

Slot 10 to

Single -48 V DC power input, 300 W output

11

Radio Power Unit A (supply power for ODU): duplex -48 V DC power input, 200 W output.

Slot 12

Radio Power Unit C (supply power for ODU RPUC

and PoE unit): high power supply unit, duplex

Slot 12

-48 V DC power input, 800 W output. RFA

RFAB

Radio Fan Unit B.

slot 9

Notes: RMUF bandwidth @ 28/40/56 MHz supports 1024QAM light modulation scheme.

The communication relationship of the mentioned units is mainly described by the block diagram is shown in Figure 3-2.

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ZXMW NR8250 Product Description

Figure 3-2

IDU block diagram Backplane Core Unit Card

NMS MON LMT USB

CPU System

Control CLK

Modem Card

Ethernet Switch

ETH Bus

TDM CrossConnect

TDM Bus

Clock Process

CLK Bus

Modem Process

IF Process

IF

ETH Card ETH OAM 1588v2

GE/FE 10GE

AUX Card EOW AUX Process

EDI

TDM Card

SC

STM-1 /STM-4 /E1

TDM Process Power Card

-48V

3.2

Power Process

Power Bus FAN Unit

ODU Structure ODU’s function units consist of IF signal input/output interface, RSSI interface, frequency converter, signal amplifier and low-noise amplifier. Only the interfaces are visible. The block diagram of the ODU is described in Figure 3-3.

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ZXMW NR8250 Product Description

Figure 3-3

3.3 3.3.1

ODU block diagram

Boards and Interfaces RCUB Figure 3-4

RCUB board front panel

TDMEXT

LMT

CLK IN/MON1 CLK OUT/MON2

RCUB interface description

Interface

50

GbE

RUN

Table 3-2

NMS

RCUB

SYS

RST

ALM

M/S

M/S CS

Type

NMS

RJ-45

GbE

RJ-45

TDMEXT

RJ-45

Description NMS service interface (1000 Base T). Gigabit Ethernet service interface (1000 Base T). It also can be used as NMS interface. TDM service cascading interface (1000 Base T).

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ZXMW NR8250 Product Description

Interface LMT

Type RJ-45

Description Local maintenance and debugging interface (100 Base TX). Clock input and monitoring access multiplex interface (software switchable), supports 2 MHz / 2 Mbps BITS or

CLK IN/MON1

RJ-45

1PPS+ToD input when working at clock input mode; receives RS485 data coming from cabinet’s monitor interface when working at monitoring mode. Clock output and monitoring access multiplex interface (software switchable), supports 2 MHz / 2 Mbps BITS or

CLK OUT/MON2

RJ-45

1PPS+ToD output when working at clock output mode; receives RS485 data coming from cabinet’s monitor interface when working at monitoring mode.

M/S

Button

Used for active/standby switchover.

RST

Button

Used for resetting the board.

RCUB board is used for system main control, clock procession and service switching, which can be installed in slot 1 to slot2. Its specific functions are shown as below: 

Performs system main control, Ethernet L2 switching and system clock synchronization function.



Provides NMS and LMT interfaces.



Offers CLK and Monitor multi-use port (software configurable) 

Input clock from CLK IN interface and distribute clock to other equipments via CLK OUT interface.



MON1/2 interface is used for cabinet’s environment monitoring, which complies with RS485 protocol.



RCUB Supports 1+1 hot standby configuration.



Provides TDM service cascading interface (TDMEXT interface).

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ZXMW NR8250 Product Description

3.3.2

RCUC/RCUC2 Figure 3-5

GE3/NMS

GE2

LMT

USB

CLK/MON

M/S

GE3/NMS

GE2

LMT

USB

CLK/MON

RUN

GE1

RST

ALM

M/S CS USB

Table 3-3

RUN

GE1

RST

ALM

M/S

RCUC2

SYS

M/S CS USB

RCUC

SYS

RCUC/RCUC2 board front panel

RCUC/RCUC2 interface description

Interface

Type

NMS

RJ-45

GbE

RJ-45

USB

USB

Description NMS service interface (1000 Base T). Gigabit Ethernet service interface (1000 Base T). It also can be used as NMS interface. USB interface convenient for efficient configuration, maintenance and management

LMT

RJ-45

Local maintenance and debugging interface (100 Base TX). Clock & Monitor multiplex interface, support clock input or

CLK/MON

HDMI

output, supports 2MHz/2Mbps BITS clock and 1PPS+ToD clock; RS485 monitor port, connect with the RS485 port of cabinet

M/S

Button

Used for active/standby switchover.

RST

Button

Used for resetting the board.

RCUC/RCUC2 board is used for system main control, clock procession and service switching, which can be installed in slot 1 to slot2. Its specific functions are shown as below: 

Performs system main control, Ethernet L2 switching and system clock synchronization function.

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ZXMW NR8250 Product Description



Compared with RCUB, new functions are added in RCUC/RCUC2: Enhanced Ethernet switching capabilities – 64Gbits/s, Compatible with 10 GbE interface board, PLA based on IDU cascading, enhanced LAG, HQoS, PFC and performance statistic per VLAN Pri/DSCP/Queue.



RCUC adopts enhanced ETH hardware design while RCUC2 provides IP MPLS/MPLS-TP hardware besides enhanced ETH. RCUC can be upgraded to RCUC2 by component replacement.

3.3.3



Provides NMS and LMT interfaces.



Offers CLK and Monitor multi-use port (software configurable).



Supports 1+1 hot standby configuration.

RMUC Figure 3-6

Table 3-4

RMUC board front panel

RMUC interface description

Interface

Type

Description

OPWR

Power switch

ODU power switch.

IF

Female TNC connector

Input /output interface of IF signals.

X_OUT/X_IN

SMA female

Input and output interface of the Cross Polarization Interference Cancellation signals. RST

Button

Reset button for RMUC.

The RMUC board implements modulation/demodulation function, which can be installed in slot 3 to slot 8. Its specific functions are described as below: 

Provides -48 V DC power for ODU.

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ZXMW NR8250 Product Description



Provides

QPSK/16

QAM/32

QAM/64

QAM/128

QAM/256

QAM

modulation/demodulation function. 

Modulation: codes and modulates the baseband signals to IF signals and sends them to ODU through the IF interface.



Demodulation: demodulates and decodes the IF signals coming from ODU.



Supports ACM, ATPC.



Supports XPIC function (2+0 XPIC, 2+2 XPIC HSB/SD/FD).



Supports 1+1 HSB/SD/FD protection.



Supports under/over-voltage protection and over-current protection at IF interface.



The maximum IF cable (5D-FB type) length between IDU and ODU is 150 meters (RG-8U IF cable is 300 meters).

3.3.4

RMUD Figure 3-7

RMUD board front panel

RST

ALM RUN

IF

ODU

Table 3-5

ON

RMUD

OFF

TX RX LINK OPWR

OPWR

RMUD interface description

Interface

Type

Description

OPWR

Power switch

ODU power switch.

IF

Female TNC connector

Input /output interface of IF signals.

RST

Button

Reset button for RMUD.

The RMUD board implements modulation/demodulation function, which can be installed in slot 3 to slot 8. Its specific functions are shown as below: 

54

Provides -48 V DC power for ODU

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ZXMW NR8250 Product Description



Provides

QPSK/16

QAM/32

QAM/64

QAM/128

QAM/256

QAM

modulation/demodulation function 

Modulation: codes and modulates the baseband signals from RCU to IF signals and sends them to ODU through the IF interface.



Demodulation: demodulates and decodes the IF signals from ODU to baseband signals and sends them to RCU.



Supports ACM, ATPC.



Supports 1+1 HSB/SD/FD protection.



Supports under/over-voltage protection and over-current protection at IF interface.



The maximum IF cable (5D-FB type) length between IDU and ODU is 150 meters (RG-8U IF cable is 300 meters).

3.3.5

RMUE Figure 3-8

RMUE board front panel

RST

ALM RUN

IF

ODU

Table 3-6

ON

RMUE

OFF

TX RX LINK OPWR

OPWR

RMUE interface description

Interface

Type

Description

OPWR

Power switch

ODU power switch.

IF

Female TNC connector

Input /output interface of IF signals.

RST

Button

Reset button for RMUE.

The RMUE board implements modulation/demodulation function, which can be installed in slot 3 to slot 8. Its specific functions are shown as below: 

Provides -48 V DC power for ODU.

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ZXMW NR8250 Product Description



Provides

QPSK/16

QAM/32

QAM/64

QAM/128

QAM/256

QAM

modulation/demodulation function 

Modulation: codes and modulates the baseband signals from RCU to IF signals and sends them to ODU through the IF interface.



Demodulation: demodulates and decodes the IF signals from ODU to baseband signals and sends them to RCU.



Supports ACM, ATPC, PIS.



Supports 1+1 HSB/SD/FD protection.



Supports under/over-voltage protection and over-current protection at IF interface.

The maximum IF cable (5D-FB type) length between IDU and ODU is 150 meters (RG-8U IF cable is 300 meters).

3.3.6

RMUH Figure 3-9

Table 3-7

RMUH board front panel

RMUH interface description

Interface

Type

Description

OPWR

Power switch

ODU power switch.

IF

Female TNC connector

Input /output interface of IF signals. Input and output interface of the

X_OUT/X_IN

SMA connector

Cross Polarization Interference Cancellation signals.

RST

Button

Reset button for RMUH.

The RMUH board implements modulation/demodulation function, which can be installed in slot 3 to slot 8. Its specific functions are described as below:

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ZXMW NR8250 Product Description



Provides -48 V DC power for ODU.



Provides QPSK/16 QAM/32 QAM/64 QAM/128 QAM/256 QAM/512 QAM/1024 QAM modulation/demodulation function 

Modulation: codes and modulates the baseband signals to IF signals and sends them to ODU through the IF interface.



Demodulation: demodulates and decodes the IF signals coming from ODU.



Supports ACM, ATPC, PIS.



Supports XPIC function (2+0 XPIC, 2+2 XPIC HSB/SD/FD).



Supports 1+1 HSB/SD/FD protection.



Supports under/over-voltage protection and over-current protection at IF interface.



The maximum IF cable (5D-FB types) length between IDU and ODU is 150 meters (RG-8U IF cable is 300 meters).

3.3.7

RMUF Figure 3-10

RMUF board front panel

ON RST

RUN

IF

XEN XST

ODU

Table 3-8

OFF

ALM

X_IN

RMUF

X_OUT TX RX LINK OPWR

OPWR

RMUF interface description

Interface

Type

Description

OPWR

Power switch

ODU power switch.

IF

Female TNC connector

Input /output interface of IF signals. Input and output interface of the

X_OUT/X_IN

SMA connector

Cross Polarization Interference Cancellation signals.

RST

ZTE Confidential & Proprietary

Button

Reset button for RMUF.

57

ZXMW NR8250 Product Description

The RMUF board implements modulation/demodulation function, which can be installed in slot 3 to slot 8. Its specific functions are described as below: 

Provides -48 V DC power for ODU.



Provides QPSK/16 QAM/32 QAM/64 QAM/128 QAM/256 QAM/512 QAM/1024 QAM//1024 QAM light/2048 QAM modulation/demodulation function. 

Modulation: codes and modulates the baseband signals to IF signals and sends them to ODU through the IF interface.



Demodulation: demodulates and decodes the IF signals coming from ODU.



Hardware prepared for 4096 QAM.



Supports ACM, ATPC, PIS.



Supports XPIC function (2+0 XPIC, 2+2 XPIC HSB/SD/FD).



Supports 1+1 HSB/SD/FD protection.



Supports under/over-voltage protection and over-current protection at IF interface.



The maximum IF cable (5D-FB types) length between IDU and ODU is 150 meters (RG-8U IF cable is 300 meters The RG-8U is recommended for 2048 QAM and upper modulation).

Notes:

3.3.8

1.

Bandwidth @ 28/40/56 MHz support 1024 QAM light modulation schedule.

2.

4096 QAM will be released in future version.

RTUA (16×E1 (native)) Figure 3-11

RTUA board front panel

RUN

58

ALM

E1 CH1 – CH16

RTUA

RST E1

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ZXMW NR8250 Product Description

Table 3-9

RTUA interface description

Interface

3.3.9

Type

Description

E1 (CH1-CH16)

DB68

Access capacity: 16×E1.

RST

Button

Reset button for RTUA.

RTUD (16×E1 (native/CES)) Figure 3-12

RTUD board front panel

RUN

E1 CH1 – CH16

Table 3-10

ALM

RTUD

RST E1

RTUD interface description

Interface

Type

Description

E1 (CH1-CH16)

DB68

Access capacity: 16×E1.

RST

Button

Reset button for RTUD.

RTUD can process both native and CES E1 service (which is software configurable and license controlled). When enable CES license, RTUD can emulate the native 16×E1 service that accessed at UNI side into 16 Ethernet streams (emulated service), or re-create the emulated service from NNI side into native E1. RTUD can be installed in slot 2 to slot 8.

3.3.10 RTUC (32×E1 (native)) Figure 3-13

RTUC board front panel

ALM RUN

ELA

ZTE Confidential & Proprietary

RTUC

RST

ELA ELB CH1 – CH16

ELB

CH17 – CH32

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ZXMW NR8250 Product Description

Table 3-11

RTUC interface description

Interface

Type

E1_A (CH1-CH16) E1_B (CH17-CH32) RST

Description

D type SCSI 64

Access capacity: 32×E1.

Button

Reset button for RTUC.

RTUC board offers 32×E1 services drop/access, which can be installed in slot 2 to slot 8.

3.3.11 RTUB (1×STM-1 + 1×STM-1/4 + 8×E1 (native)) Figure 3-14

RTUB board front panel

RST

TX1

Table 3-12

RX1

TX2

RUN

DB36

ALM

STM-1/4

RTUB

STM-1 S1 S2 E1

E1 CH1 – CH8

RX2

RTUB interface description

Interface

Type

Description

E1 (CH1-CH8)

DB36

PDH access capacity: 8×E1.

STM-1 Tx1 / Rx1

SFP, LC

SDH access capacity: 1×STM-1.

STM-1/4 Tx2 / Rx2

SFP, LC

SDH access capacity: 1×STM-1 or 1×STM-4.

RST

Button

Reset button for RTUB.

The RTUB board is used for the access/drop of E1, STM-1 and STM-4 services. It can be installed in slots 2 to slot 8. Its specific functions are shown as below: 

Offers E1 interface (8×E1).



Offers one STM-1 interface and one STM-1/4 configurable interface 

SDH access/drop capacity is 2×STM-1 (channelized/un-channelized) or 1×STM-4.



Accessing and dropping capacity is 63×E1 (cross connection between E1 and STM-1) or 4×STM-1s (cross connection between STM-1 and STM-4).

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

Supports wireless TDM SNCP protection.

3.3.12 RTUE (2xSTM-1 (CES)) Figure 3-15

RTUE board panel

RST

RUN

S1 S2 TX1

Table 3-13

ALM

STM-2

RTUE

STM-1

RX1

TX2

RX2

RTUE interfaces description

Interface

Type

Description

STM-1 Tx1 / Rx1

SFP, LC

SDH access capacity: 1×ch.STM-1.

STM-1 Tx2 / Rx2

SFP, LC

SDH access capacity: 1×ch.STM-1.

RST

Button

Reset button for RTUE.

RTUE possesses circuit emulation function, which can emulate the native 2×ch.STM-1 service that accessed at UNI (User Network Interface) side into 2×63 Ethernet streams (emulated service), or re-create the emulated service into native ch.STM-1 . RTUE can be installed in slot 2 to slot 8 (Notes: RTUE only support channelized STM-1).

3.3.13 RTUNO (2×GbE(O) + 2×GbE(O/E)) Figure 3-16

RTUNO board front panel

RX2

TX3

RX3

TX4

RX4

GbE2

GbE1

GbE2

GbE3

RST

RUN

CLASS1 LASER PRODUCT

GbE1

Table 3-14

TX2

RTUNO

RX1

ALM

TX1

GbE1 GbE2 GbE3 GbE4

GbE4

RTUNO interface description

Interface

Type

Description

GbE (O)

SFP, LC

1000 Base-LX or 1000 Base-SX optical interface.

GbE (E)

RJ-45

1000 BaseT electrical interface.

RST

Button

Reset button for RTUNO.

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ZXMW NR8250 Product Description

The RTUNO board provides 4 GbE (optical default) interfaces for Ethernet services access. It can be installed in slot 2 to slot 8. Its specific functions are shown as below: 

RTUNO provides 2×GbE(O) + 2×GbE(O/E) interfaces, max. 4×GbE(O) or 2×GbE(O) + 2×GbE(E) interfaces can be used.



GbE interfaces support Sync. E, 1588v2 and ETH OAM.

3.3.14 RTUNE (2×GbE(E) + 2×GbE(E/O)) Figure 3-17

RX1

Table 3-15 Interface

RX2

GbE2

CLASS1 LASER PRODUCT

GbE1

GbE2

GbE3

RST

RUN

GbE1

TX2

RTUNE

TX1

ALM

GbE1 GbE2 GbE3 GbE4

RTUNE board front panel

GbE4

RTUNE interface description Type

Description

GbE (E)

RJ-45

1000 BaseT electrical interface.

GbE (O)

SFP, LC

1000 Base-LX or 1000 Base-SX optical interface.

RST

Button

Reset button for RTUNE.

The RTUNE board provides 4 GbE (electrical default) interfaces for Ethernet services access. It can be installed in slot 2 to slot 8. Its specific functions are shown as below: 

RTUNE provides 2×GbE (E) + 2×GbE(O/E) interfaces, max. 4×GbE(E) or 2×GbE(E) + 2×GbE(O) interfaces can be used.



GbE interfaces support Sync. E, 1588v2 and ETH OAM.

Notes: 10/100 BaseT and 1000 BaseT use super CAT5 twisted pair cables.

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ZXMW NR8250 Product Description

3.3.15 RTUHO (3×GbE(O) + 8×E1(native)) Figure 3-18

RTUHO board front panel

TX2

TX3

RX3 RST

GbE2

GbE3

RUN

GbE1

Table 3-16

RX2

RTUHO

RX1

ALM

TX1

GbE1 GbE2 GbE3 E1

E1 CH1 – CH8

RTUHO interface description

Interface

Type

Description

GbE (O)

SFP, LC

1000 Base-LX or 1000 Base-SX optical interface.

E1 (CH1-CH8)

DB36

Access capacity: 8×E1.

RST

Button

Reset button for RTUHO.

The hybrid board RTUHO offers E1 and GbE interfaces, which can be installed in slot 2 to slot 8. Its specific functions are described as below: 

RTUHO provides 3×GbE (O) + 8×E1 interfaces.



GbE interfaces support Sync. E, 1588v2 and ETH OAM.

3.3.16 RTUHE (3×GbE(E) + 8×E1(native)) Figure 3-19

RTUHE board front panel

GbE2

GbE3

RUN

GbE1

RTUHE

Table 3-17

RST

ALM

GbE1 GbE2 GbE3 E1

E1 CH1 – CH8

RTUHE interface description

Interface

Type

Description

GbE (E)

RJ-45

1000 BaseT electrical interface.

E1 (CH1-CH8)

DB36

Access capacity: 8×E1.

RST

Button

Reset button for RTUHE.

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The hybrid board RTUHE offers E1 and GbE interfaces. It can be installed in slot 2 to slot 8. Its specific functions are as shown below: 

RTUHE provides 3×GbE (E) + 8×E1interfaces.



GbE interfaces support Sync. E, 1588v2 and ETH OAM.

3.3.17 RTUNP (2×GbE(POE)) Figure 3-20

Table 3-18 Interface

RTUNP board front panel

RTUNP interface description Type

Description

GbE (E)

RJ-45

1000 BaseT electrical interface (support PoE).

RST

Button

Reset button for RTUNP.

The RTUNP board provides GbE (electrical, support PoE) interfaces for Ethernet access or power supply for NR8950 with Power over Ethernet (PoE) technique. RTUNP board can be installed in slot 3 to slot 8.

3.3.18 RPEA (2×GbE(E) +2×GbE(POE)) Figure 3-21

Table 3-19 Interface GbE (POE)

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RPEA board front panel

RPEA interface description Type RJ-45

Description 1000 BaseT electrical interface (support PoE).

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Interface

Type

Description

GbE (E)

RJ-45

1000 BaseT electrical interface

RST

Button

Reset button for RPEA.

The RPEA board provide GbE and GbE(POE) interfaces, which can be installed in slot 3 to slot 8. Its specific functions are described as below: 

RPEA provides 2×GbE (electrical) interfaces for Ethernet access



2×GbE (POE) interfaces provide power supply for NR8950 with Power over Ethernet (PoE) technique.



GbE interfaces support Sync. E, 1588v2 and ETH OAM.

3.3.19 RTUIO (1×10GbE(O)) Figure 3-22

Table 3-20

RTUIO board front panel

RTUIO interface description

Interface

Type

Description

10GbE (O)

SFP+, LC

10GBase-LR or 10GBase-ER optical interface.

RST

Button

Reset button for RTUIO.

The RTUIO board provides one 10GbE optical interface for Ethernet services access. It can be installed in slot 2 to slot 4, and it supports 1+1 protection via two RTUIO boards.

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3.3.20 RSUA Figure 3-23

RSUA board front panel

EOW

SC1

SC2

RUN

CALL

ALM

RSUA

RST

DB36 DB25 EDI

RSUA offers auxiliary service interfaces as shown in Table 3-21.

Table 3-21 Interface EDI

EOW

RSUA interface description Type DB25

Description External alarm interface, total 8 ways input, 2 ways output.

3.5 mm

Engineering order wire is used for audio transmission

female audio

for maintenance purposes, which should be used

socket

together with call button. Service channel delivers user’s special traffic through

SC1

RJ-45

an RJ-45 connector, supports V.11 synchronization and asynchronization signal. Service channel delivers user’s special traffic through

SC2

RJ-45

an RJ-45 connector, support V.28 asynchronous signal.

CALL

Button

Call button is used to call remote EOW phone.

RST

Button

Reset button for RSUA.

3.3.21 PM Figure 3-24

66

PM board front panel

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Table 3-22

PM interface description

Interface

Type

Description

-48 V RTN

Hybrid type connector

-48 V DC power input interface.

OFF/ON

Switch

PM power switch.

MON

Mini-USB

Reserved for engineering debugging.

PM is a power supply board, which is used for power supply for IDU modular. It can be installed in slot 10 to slot 11. Its specific functions are shown below: 

-48 V DC power input; supplies power for other boards of IDU except RPUA/RPUC.



Supports under/over-voltage input and over-current protection.



Supports power reverse connection protection.



Supports lightning and surge protection.



Supports 1+1 power protection with two PM boards.

3.3.22 RPUA Figure 3-25

Table 3-23

RPUA board front panel

RPUA interface description

Interface

Type

Description

PS1

2-core -48 V power connector

-48 V DC power input interface.

PS2

2-core -48 V power connector

-48 V DC power input interface.

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RPUA is used for power supply for ODUs and a few NR8950s, which can be installed in slot 12. Its specific functions are described as following: 

-48 V DC input, which provides -48 V DC power for ODU or NR8950 (max. 2 NR8950s via PoE).



Supports under/over-voltage input and over-current protection.



Supports power reverse connection protection.



Supports lightning and surge protection.



Supports input power protection with one RPUA board.

3.3.23 RPUC Figure 3-26

Table 3-24

RPUC board front panel

RPUC interface description

Interface

Type

Description

PS1

2-core -48 V power connector

-48 V DC power input interface.

PS2

2-core -48 V power connector

-48 V DC power input interface.

Compared with RPUA, RPUC is a higher power supply unit, which is used for power supply for ODUs and multiple NR8950s. RPUC can be installed in slot 12 and its specific functions are shown as below: 

-48 V DC in-put, which provides -48 V DC power for ODU or NR8950 (max. 12 NR8950s via PoE).

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

Supports under/over-voltage input and over-current protection.



Supports power reverse connection protection.



Supports lightning and surge protection.



Supports input power protection with one RPUC board.

3.3.24 RFAB Figure 3-27

RFAB board front panel

The RFAB board is the system fan control board. It is installed in slot 9. Its specific functions include: 

Driving six fan modules.



Supports temperature detection and fan speed monitoring.



Supports intelligent speed adaptation.

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ZXMW NR8250 Product Description

4

NMS: Network Management System ZTE provides a unified and simplified network management system for different management requirement. One of the following solutions can be chosen as a management method: 

Simplified LMT for local Maintenance.



Scalable NetNumen™ U31 for unified Maintenance.



LMT combine with U31 is suggested for full-scale solution.

Figure 4-1

Network management solution

Database

Firewall

NMS/OSS

Server B

Server A

ZTE MW EMS

LMT ZTE MW Network

4.1

Unified NMS Solution, Powerful Management NetNumen™ U31 is a unified element management product under ZTE's product brand--NetNumen™. As a major component of ZTE’s network management products, U31 is capable to provide consolidated network operation and maintenance for all ZTE equipments and networks. ZTE NetNumen™ U31 microwave EMS has a leading and mature management system architecture that perfectly conforms to all ITU-T TMN and 3GPP specifications. The high

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scalability of NetNumen™ U31 ensures a smooth upgrade having a minimum impact on the existing system. It qualifies the following properties 

Based on the J2EE (Java 2 Enterprise Edition) platform.



Uniform management of microwave NEs.



Rich northbound interfaces such as: CORBA, SNMP, FILE and DB are available, easily to be integrated to various OSSs.



High-level UNIX servers to enable high integration, high performance and good security.



Multiple access methods such as: GUI and Web.

U31 provides powerful functions such as fault management, topology management, performance management, configuration management, E2E management, security management, log management, inventory management and various statistics reports. TIPS: Please refer to Microwave NetNumen™ U31 Product Description for detail information.

4.2

Web-based LMT, Easy Maintenance LMT is a Web-based local maintenance terminal for configuring and maintaining IDU as well as the connected ODUs at local. It is embedded in NR8250 IDU and no additional software installation is required. Users can manage the IDU via the IE browser in the PC through the LMT or NMS interface. LMT

provides

alarm

management,

configuration

management,

performance

management, maintenance management, security management, and

language

management. For illegal access prevention, LMT user authority is graded to 3 levels: 1.

Administrator

2.

Operator

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ZXMW NR8250 Product Description

3.

Browse User

Administrator has the highest authority and browse user is the lowest. The OMC could set different password for each kind of user to ensure the management security. Furthermore, IDU will record and send the log and configure action to the EMS server.

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5

Configuration and Application

5.1

NR8250 Typical Configurations NR8250 supports point-to-point, link, tree, and ring networking configurations, as shown in Table 5-1.

Table 5-1

NR8250 typical configurations

Protection Mode

Networking

1+0 Unprotected Link 2+0 XPIC 1+1 HSB

Protected Link

Ring Network Protection Nodal Protection

5.1.1

Network Configuration

Type

1+0, 2×(1+0), 3×(1+0), 4×(1+0), 5×(1+0), 6×(1+0) 2+0, 2×(2+0), 3×(2+0) 1+1 HSB, 2×(1+1) HSB, 3×(1+1) HSB

1+1 SD

1+1 SD, 2×(1+1) SD, 3×(1+1) SD

1+1 FD

1+1 FD, 2×(1+1) FD, 3×(1+1) FD

2+2 XPIC HSB

2+2 XPIC HSB

2+2 XPIC SD

2+2 XPIC SD

Ring network

SNCP, STP/RSTP/MSTP/ERPS1.0/ERPS2.0/ELPS

Nodal

2×(1+0) + 2×(1+1) HSB

networking

2×(1+0) + 2×(1+1) SD

1+0 Configuration NR8250 supports 1+0, 2×(1+0), 3×(1+0), 4×(1+0), 5×(1+0), and 6×(1+0) networking configurations. The basic configuration 1+0 is shown in Figure 5-1.

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ZXMW NR8250 Product Description

Figure 5-1

1+0 configuration diagram

In N×(1+0) network configuration, the material requirement of a single site is shown in Table 5-2.

Table 5-2

1+0 configuration requirements per site Configuration Requirements (PCS)

Components 1+0

2×(1+0)

3×(1+0)

4×(1+0)

5×(1+0)

6×(1+0)

RMU

1

2

3

4

5

6

ODU

1

2

3

4

5

6

Antenna

1

2

3

4

5

6

IF Cable

1

2

3

4

5

6

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.1.2

1+1 HSB Configuration 1+1 HSB is 1+1 hardware hot standby protection. In 1+1 HSB configuration, main ODU and standby ODU are installed on the same antenna to provide hardware level protection..

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Figure 5-2

1+1 HSB configuration diagram

In N × (1+1) HSB configuration mode, the required material of single site is shown in Table 5-3.

Table 5-3

1+1 HSB configuration requirements per site Configuration Requirements (PCS)

Components 1+1 HSB

2×(1+1) HSB

3×(1+1) HSB

RMU

2

4

6

ODU

2

4

6

Antenna

1

2

3

IF Cable

2

4

6

Combiner

1

2

3

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.1.3

1+1 SD Configuration 1+1 SD provides hardware backup and is especially effective at mitigating multipath situations.

In the 1+1 SD protection mode, the active ODU and standby ODU are

installed on different antennas. This enables the system to receive signals from different radio links at the same time, which provides full-time hardware and wireless link protection. The diagram of 1+1 SD is shown in Figure 5-3.

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ZXMW NR8250 Product Description

Figure 5-3

1+1 SD configuration diagram

In N × (1+1) SD configuration, the required material of a single site is shown in Table 5-4.

Table 5-4

1+1 SD configuration requirements per site Configuration Requirements (PCS)

Components 1+1 SD

2×(1+1) SD

3×(1+1) SD

RMU

2

4

6

ODU

2

4

6

Antenna

2

4

6

IF Cable

2

4

6

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.1.4

1+1 FD Configuration 1+1 FD is used for combating frequency-selective fading and meanwhile provides hardware backup.

In 1+1 FD protection mode, service can be sent and received

through two different frequency points on the same radio link, which provides full-time hardware and wireless link protection. This mode reduces link fading caused by multi-path reflection and improves link stability. The diagram of 1+1 FD is shown in Figure 5-4.

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Figure 5-4

1+1 FD configuration diagram F1

F2

In N×(1+1 FD) configuration mode, the required material of single site is shown in Table 5-5.

Table 5-5

1+1 FD configuration requirements per site Configuration Requirements (PCS)

Components 1+1 FD

2×(1+1) FD

3×(1+1) FD

RMU

2

4

6

ODU

2

4

6

Antenna

1

2

3

IF Cable

2

4

6

Combiner

1

2

3

Notes: The quantity and type of service interface and license depends on the actual requirement. In this scenario F1 & F2 are covered by the same combiner and antenna.

5.1.5

2+0 XPIC Configuration NR8250 supports 2+0 XPIC, 2 × (2+0) XPIC and 3×(2+0) XPIC configurations. With XPIC function, the capacity is doubled. The diagram of 2+0 XPIC configuration is shown in Figure 5-5.

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ZXMW NR8250 Product Description

Figure 5-5

2+0 XPIC configuration diagram

V

V

H

H

In N×(2+0) XPIC configuration mode, required material of single site is shown in Table 5-6.

Table 5-6

2+0 XPIC configuration requirements per site Configuration Requirements (PCS)

Components 2+0 XPIC

2×(2+0) XPIC

3×(2+0) XPIC

RMU

2

4

6

ODU

2

4

6

Antenna

1

2

3

IF Cable

2

4

6

XPIC Cable

2

4

6

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.1.6

2+2 XPIC HSB Configuration 2+2 XPIC HSB means each polarization of 2+0 XPIC is protected with hot standby configuration. Each NR8250 IDU offers 1 group 2+2 XPIC HSB configuration. In 2+2 XPIC HSB configuration, main ODU and standby ODU are mounted on one combiner/hybrid and then fixed on one antenna. The combiner/hybrid might be a balanced or unbalanced type. The diagram of 2+2 XPIC HSB configuration is shown in Figure 5-6.

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Figure 5-6

2+2 XPIC HSB configuration diagram V

V

H

H

In 2+2 XPIC HSB configuration mode, the required material of single site is shown in Table 5-7.

Table 5-7

2+2 XPIC HSB configuration requirements per site XPIC Configuration Requirements (PCS)

Components 2+2 XPIC HSB RMU

4

ODU

4

Antenna

1

IF Cable

4

Combiner

2

XPIC Cable

4

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.1.7

2+2 XPIC SD Configuration 2+2 XPIC SD means each polarization of 2+0 XPIC is protected with space diversity configuration. Each NR8250 IDU offers 1 group 2+2 XPIC SD configuration. In the 2+2 SD protection mode, the active ODUs and standby ODUs are mounted on different antennas. This enables the system to receive signals from different paths at the same time, which provides full-time hardware and wireless link protection. The diagram of 2+2 XPIC SD configuration is shown in Figure 5-7.

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ZXMW NR8250 Product Description

Figure 5-7

2+2 XPIC SD configuration diagram V

V

H

H

V

V

H

H

In 2+2 XPIC SD configuration mode, the required material of single site is shown in Table 5-8.

Table 5-8

2+2 XPIC SD configuration requirements per site XPIC Configuration Requirements (PCS)

Components 2+2 XPIC SD RMU

4

ODU

4

Antenna

2

IF Cable

4

XPIC Cable

4

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.1.8

N+1 Configuration N+1 Configuration means if any one of N working channels is interrupted, the traffic will be switched to the standby channel (N≤3). As shown in Figure 5-8, 2+1 configuration is described in this chapter. In 2+1 configuration, standby ODU via combiner connected to 2+0 XPIC Configuration， two main channel and one standby channel can transmit over two different frequency points

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Figure 5-8

2+1 configuration diagram

The required material of the nodal site is shown in Table 5-9.

Table 5-9

2+1 protection configuration requirements per site Configuration Requirements (PCS)

Components 2+1 protection RMU

3

ODU

3

Antenna

1

IF Cable

3

Combiner

1

XPIC Cable

2

As shown in Figure 5-9, 3+1 configuration is described in this chapter. In 3+1 configuration, two 2+0 XPIC environment are connected to the same antenna via combiner, and the two 2+0 XPIC environment using two different frequency points, so there are four separate working channels (two H polarization and two V polarization), select one channel as standby, the other as the primarily.

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ZXMW NR8250 Product Description

Figure 5-9

3+1 configuration diagram

The required material of the nodal site is shown in Table 5-10.

Table 5-10

3+1 protection configuration requirements per site Configuration Requirements (PCS)

Components 3+1 protection

5.1.9

RMU

4

ODU

4

Antenna

1

IF Cable

4

Combiner

2

XPIC Cable

4

Nodal Configuration NR8250 supports the hybrid configuration of 1+0, 1+1 HSB/SD/FD and XPIC, the station has this kind of configuration is usually called Nodal site. The maximum direction of each IDU is 6. As shown in Figure 5-10, a nodal site with 2×(1+0) + 2×(1+1) HSB hybrid configuration is described in this chapter.

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Figure 5-10

Nodal configuration diagram

1+1 HSB

NR8250

1+0 1+1 HSB 1+0

NR8250

NR8250

NR8250

Nodal site

NR8250

The required material of the nodal site is shown in Table 5-11.

Table 5-11

Nodal configuration requirements (2 × (1+0) + 2 × (1+1) HSB)

Components

Configuration Requirements (PCS)

RMU

6

ODU

6

Antenna

4

IF Cable

6

Notes: The quantity and type of service interface and license depends on the actual requirement.

5.2

NR8250 with NR8950 Typical Configuration NR8250 together with NR8950 provides two power supply mode: Power over Ethernet and DC power over power cable. It supports point-to-point, link, tree, and ring networking configurations, as shown in Table 5-12.

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ZXMW NR8250 Product Description

Table 5-12

NR8250 with NR8950

Protection Mode

Networking

Network Configuration (NR8250 with

Type

NR8950)

1+0 Unprotected Link 2+0 XPIC

N x (1+0), (N=1,2,…,12 with PoE), N x (1+0), (N=1,2,…,20 with DC power), N x (2+0), (N=1,2,…,6 with PoE), N x (2+0), (N=1,2,…,10 with DC power), N x (1+1) HSB/SD/FD (N=1,2,…,6 with PoE),

1+1 HSB

N x (1+1) HSB/SD/FD (N=1,2,…,10 with DC power),

Protected Link 2+2 XPIC HSB Ring Network Protection Nodal Protection

5.2.1

Ring network

N x (2+2) XPIC HSB/SD(N=1,2,3, with PoE), N x (2+2) XPIC HSB/SD(N=1,2,3,4,5, with DC power), SNCP, STP/RSTP/MSTP/ERPS1.0/ERPS2.0/ELPS

Nodal

1 × (4+0) + 4 × (1+1) HSB/SD/FD with PoE

networking

1 x (4+0) + 8 × (1+1) HSB/FD with DC power

PoE Condition (Power over Ethernet)

5.2.1.1 1+0 Configuration NR8250 together with NR8950 supports N x (1+0) networking configurations, N is up to 12 with PoE configured. The basic configuration 1+0 is shown in Figure 5-11.

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Figure 5-11

1+0 configuration diagram

NR8950

Ethernet Cable (POE)

RTUNP (Integrated Power Injector Card)

NR8250

1+0

Table 5-13

1+0 configuration requirements per site Configuration Requirements (PCS)

Components

N x (1+0) (N=2,3,…,12)

1+0 NR8950

1

N (N=2,3,…,12)

NR8250

1

1

RTUNP/RPEA

1

Round up (N/2) (N=2,3,…,12)

Antenna

1

N (N=2,3,…,12)

Ethernet Cable

60m

N x 60m (N=2,3,…,12)

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

5.2.1.2 1+1 HSB Configuration 1+1 Hot Standby (HSB) is 1+1 hardware hot standby protection. NR8250 supports N x (1+1) HSB networking configurations together with NR8950, N is up to 6 with PoE configured.

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ZXMW NR8250 Product Description

In 1+1 HSB configuration, main NR8950 and standby NR8950 are installed on the same antenna to provide hardware level hot standby protection.

Figure 5-12

1+1 HSB configuration diagram

NR8950 AOU Protection cable

Combiner

Ethernet Cable (POE) RTUNP (Integrated Power Injector Card)

AOU

NR8250

1+1 HSB

Table 5-14

1+1 HSB configuration requirements per site Configuration Requirements (PCS)

Components

N x (1+1) HSB (N=2,3,…,6)

1+1 HSB NR8950

2

2 x N (N=2,3,…,6)

NR8250

1

1

RTUNP/RPEA

1

N (N=2,3,…,6)

Antenna

1

N (N=2,3,…,6)

Ethernet Cable

120m

N x 120m(N=2,3,…,6)

Combiner

1

N (N=2,3,…,6)

Protection Cable

1

N (N=2,3,…,6)

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

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5.2.1.3 1+1 SD Configuration 1+1 Space Diversity (SD) is 1+1 hardware link path hot standby protection. NR8250 supports N x (1+1) SD networking configurations together with NR8950, N is up to 6 with PoE configured. In the 1+1 SD protection mode, the active NR8950 and standby NR8950 are installed on different antennas. This enables the system to receive signals from different radio links at the same time, which provides full-time hardware and wireless link protection. The diagram of 1+1 SD is shown in Figure 5-13.

Figure 5-13

1+1 SD configuration diagram

Protection cable

NR8950

Ethernet Cable (POE)

RTUNP (Integrated Power Injector Card)

NR8250

1+1 SD

Table 5-15

1+1 SD configuration requirements per site Configuration Requirements (PCS)

Components

N x (1+1) SD (N=2,3,…,6)

1+1 SD NR8950

2

2 x N (N=2,3,…,6)

NR8250

1

1

RTUNP/RPEA

1

N (N=2,3,…,6)

Antenna

2

2 x N (N=2,3,…,6)

Ethernet Cable

120m

N x120m (N=2,3,…,6)

Protection Cable

1

N (N=2,3,…,6)

TIPS:

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ZXMW NR8250 Product Description

1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

5.2.1.4 1+1 FD Configuration 1+1 Frequency Diversity (FD) is 1+1 hardware link path hot standby protection. NR8250 supports N x (1+1) FD networking configurations together with NR8950, N is up to 6 with PoE configured. In the 1+1 FD protection mode, service can be sent and received through two different frequency points on the same radio link, which provides full-time hardware and wireless link protection. This mode reduces link fading caused by multi-path reflection and improves link stability. The diagram of 1+1 FD is shown in Figure 5-14.

Figure 5-14

1+1 FD configuration diagram

f1

NR8950

f2

AOU Protection cable

Combiner

Ethernet Cable (POE) RTUNP (Integrated Power Injector Card)

AOU

NR8250

1+1 FD

Table 5-16

1+1 FD configuration requirements per site Configuration Requirements (PCS)

Components

N x (1+1) FD (N=2,3,…,6)

1+1 FD

88

NR8950

2

2 x N (N=2,3,…,6)

NR8250

1

1

RTUNP/RPEA

1

N (N=2,3,…,6)

Antenna

1

N (N=2,3,…,6)

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ZXMW NR8250 Product Description

Configuration Requirements (PCS) Components

N x (1+1) FD (N=2,3,…,6)

1+1 FD Ethernet Cable

120m

N x 120m (N=2,3,…,6)

Combiner

1

N (N=2,3,…,6)

Protection Cable

1

N (N=2,3,…,6)

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

5.2.1.5 2+0 XPIC Configuration NR8250 supports N x ( 2+0) XPIC networking configurations together with NR8950, N is up to 6 with PoE configured. With XPIC function, the capacity is doubled. The diagram of 2+0 XPIC configuration is shown in Figure 5-15.

Figure 5-15

2+0 XPIC configuration diagram NR8950

NR8950 (V) XPIC cable

NR8950 (H)

Ethernet Cable (POE) RTUNP (Integrated Power Injector Card)

NR8250

2+0 XPIC

Table 5-17

2+0 XPIC configuration requirements per site Configuration Requirements (PCS)

Components 2+0 XPIC

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N x (2+0) XPIC (N=2,3,…,6)

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ZXMW NR8250 Product Description

Configuration Requirements (PCS) Components

N x (2+0) XPIC (N=2,3,…,6)

2+0 XPIC NR8950

2

2 x N (N=2,3,…,6)

NR8250

1

1

RTUNP/RPEA

1

N (N=2,3,…,6)

Antenna

1

N (N=2,3,…,6)

Ethernet Cable

120m

N x 120m (N=2,3,…,6)

XPIC Cable

2

2 x N (N=2,3,…,6)

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

5.2.1.6 2+2 XPIC HSB Configuration 2+2 XPIC HSB means each polarization of 2+0 XPIC is protected with hot standby configuration. Each NR8250 offers up to 3 group 2+2 XPIC HSB configurations together with NR8950. In 2+2 XPIC HSB configuration, main NR8950s and standby NR8950s are mounted on one combiner/hybrid and then fixed on one antenna. The combiner/hybrid might be a balanced or unbalanced type. The diagram of 2+2 XPIC HSB configuration is shown in Figure 5-16.

90

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ZXMW NR8250 Product Description

Figure 5-16

2+2 XPIC HSB configuration diagram NR8950

AOU (V) Protection cable

Combiner

Ethernet Cable (POE)

AOU (V)

RTUNP (Integrated Power Injector Card)

AOU (H) XPIC cable

Combiner

NR8250

AOU (H)

Table 5-18

2+2 XPIC HSB

2+2 XPIC HSB configuration requirements per site Configuration Requirements (PCS)

Components 2+2 XPIC HSB

2x(2+2) XPIC HSB

3x(2+2) XPIC HSB

NR8950

4

8

12

NR8250

1

1

1

RTUNP/RPEA

2

4

6

Antenna

1

2

3

Ethernet Cable

240m

480m

720m

Combiner

2

4

6

Protection Cable

2

4

6

XPIC Cable

4

8

12

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

5.2.1.7 2+2 XPIC SD Configuration 2+2 XPIC SD means each polarization of 2+0 XPIC is protected with space diversity configuration. Each NR8250 offers up to 3 group 2+2 XPIC SD configurations together with NR8950.

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ZXMW NR8250 Product Description

In 2+2 XPIC SD configuration, main NR8950s and standby NR8950s are mounted on different antennas. This enables the system to receive signals from different paths at the same time, which provides full-time hardware and wireless link protection. The diagram of 2+2 XPIC SD configuration is shown in Figure 5-17.

Figure 5-17

2+2 XPIC SD configuration diagram

NR8950

AOU (V) Protection cable

XPIC cable

AOU (H) RTUNP (Integrated Power Injector Card)

Ethernet Cable (POE) AOU (V) XPIC cable

NR8250 AOU (H)

Table 5-19

2+2 XPIC SD

2+2 XPIC SD configuration requirements per site Configuration Requirements (PCS)

Components 2+2 XPIC SD

2x(2+2) XPIC SD

3x(2+2) XPICSD

NR8950

4

8

12

NR8250

1

1

1

RTUNP/RPEA

2

4

6

Antenna

2

4

6

Ethernet Cable

240m

480m

720m

Protection Cable

2

4

6

XPIC Cable

4

8

12

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

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ZXMW NR8250 Product Description

5.2.1.8 Nodal Configuration In order to present the typical configuration of NR8950 together with NR8950 and NR8250 in network, this chapter will show an example for this integrated solution.

Figure 5-18

Table 5-20

Typical nodal configuration diagram (4× (1+0) + 4× (1+1) HSB)

Nodal configuration requirements (4× (1+0) + 4× (1+1) HSB)

Components

Configuration Requirements (PCS)

NR8950

12

NR8250

5

RTUNP/RPEA

10

Antenna

16

Ethernet Cable

720m

Protection Cable

8

TIPS:

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ZXMW NR8250 Product Description

1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable.

5.2.2

DC Power Condition Compare with PoE input, RTUNP board will be replaced by RTUNE/RTUNO, and additional DC power is requested through power cable connection. In this chapter, 1+1 HSB with DC power will be introduced as an example, the rest can be done in the same manner.

Figure 5-19

1+1 HSB configuration diagram

NR8950 AOU Protection cable

Combiner

AOU

Ethernet Cable DC Power Cable

RTUNE/RTUNO (4GbE interface)

-48 VDC

NR8250

1+1 HSB

Table 5-21

1+1 HSB configuration requirements per site Configuration Requirements (PCS)

Components

N x (1+1) HSB (N=2,3,…,10)

1+1 HSB NR8950

2

2 x N (N=2,3,…,10)

NR8250

1

1

RTUNE/RTUNO

1

N (N=2,3,…,10)

Antenna

1

N (N=2,3,…,10)

120m

N x 120m (N=2,3,…,10)

1

N (N=2,3,…,10)

Ethernet Cable or Optical Cable Combiner

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Configuration Requirements (PCS) Components 1+1 HSB

N x (1+1) HSB (N=2,3,…,10)

Protection Cable

1

N (N=2,3,…,10)

Power cable

120m

N x 120m (N=2,3,…,10)

TIPS: 1)

The quantity and type of service interface, license and accessories depend on the actual requirement.

2)

The distance between NR8250 IDU and NR8950 must shorter than 100 meters due to the limitation of Ethernet cable

5.3

Application Scenarios As versatile equipment, NR8250 can be used as access site, aggregation site and metro site in chain and ring network topology. In order to enhance the reliability and resilience, 1+1 protection configuration is usually adopted in chain network. With Ethernet STP/RSTP/MSTP,G.8032v1,G.8032v2 and wireless SNCP ring protection schemes, the service availability and management data are guaranteed. In ring network, 1+0 non-protection configuration is adopted to reduce the CAPEX (equipment, room space and project).

5.3.1

Tree Network Tree topology is wildly used in backhaul network, which is a kind of simple and easy deployment transmission solution. Figure 5-20 shows a simply tree network: 1+0 configuration is widely adopted in access layer and 2+0 east-to-west is adopted for aggregation layer

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ZXMW NR8250 Product Description

Figure 5-20

Tree network solution (hybrid)

Access

Aggregation 1+0

Metro

1+1

1+1 STM-1/4

E1

Carrier Network

BTS

GbE 2+0 XPIC

1+0 1+0

FE Node B

E1

Microwave Network

1+0

BTS

BSC

RNC/ aGW

FE NR8120/NR8950

NR8150

NR8250

/NR8120A/NR8120D Node B

Notes: NR8250 can be connected to RNC/BSC directly if the carrier network is not requested.

In the network, access, aggregation and metro sites might have different configurations, the ZTE’s suggestion is: 

1+0 non-protection is widely adopted in access layer. For important link, 1+1 protection configuration is a better choice.



1+1 protection configuration is usual adopted in aggregation layer, which enhance the reliability of the service. Sometimes, 2+0 FD or 2+0 XPIC function is used for high throughput link.



For minority metro sites, 1+1 protection configuration is adopted for medium capacity link and 2+2 XPIC configuration is deployed for high throughput link.



At the joint site of microwave and carrier network, link aggregation (LAG) or SNCP could offer link protection for Ethernet or TDM service.

5.3.2

Ring Network Ring topology is mainly used in aggregation layer, which offers a resilient backhaul network. This kind of network is favored by the operators who dislike 1+1 protection configuration and also the ones planning to deploy LTE/4G network.

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Figure 5-21 shows a simple network with ring topology, here, 1+0 configuration is widely adopt in access layer and 2+0 east-to-west is adopt for aggregation layer (ring topology part).

Figure 5-21

Single ring network solution

Access

Aggregation 1+0

Metro

1+1

E1 BTS

BSC

FE

1+0

STM-1/4 Ring

Node B

GbE

Carrier Network

E1 1+0

BTS

FE NR8120/NR8950 /NR8120A/NR8120D

NR8150

RNC /aGW

NR8250

Node B

Notes: NR8250 can be connected to RNC/BSC directly if the carrier network is not requested.

Figure 5-22

Multiple ring network solution

Access

Aggregation 1+0

Metro

1+1

E1 BTS

BSC

FE

1+0

STM-1/4 Ring

Node B

GbE

Carrier Network

E1 1+0

BTS

Ring

FE RNC /aGW Node B

NR8120/NR8950 /NR8120A/NR8120D

NR8150

NR8250

In the ring network, SNCP might be used to protect E1 and STM-1 services, ERPS1.0 is used to provide carrier grade single ring Ethernet protection, which solves the issue of

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ZXMW NR8250 Product Description

single ring topology, and ERPS2.0 is used to provide carrier grade multiple ring Ethernet protection, as shown in Figure 5-22, which deals with the topology issue about polycyclic intersecting and polycyclic tangent. In the network, access, aggregation and metro sites might have different configurations, the ZTE’s suggestion is: 

1+0 non-protection is widely adopted at access sites. For important link, 1+1 protection configuration is used.



2+0 XPIC configuration could be used at access layer at LTE/4G times



2+0 east-to-west configuration is widely adopted in the ring, which could reduce the CAPEX (equipment, room space and project). Sometimes, XPIC function is used for high throughput link.



For minority metro sites, 1+1 protection configuration is adopted for medium capacity link and 2+2 XPIC configuration is deployed for high throughput link.



The NR8250 of aggregation site or metro site can be connected to the BSC/RNC directly or through the carrier network.



Link aggregation (LAG) or STM-1 MSP 1+1 can offer Ethernet link protection or STM-1 line protection at the joint node between microwave and carrier network.

5.3.3

All-Packet Switching Application NR8000 is widely used for offering carrier grade Ethernet transmission where the packet based traffic is predominant, giving consideration to support the legacy TDM traffic. As shown in figure 5-23, there are only a few legacy of E1 services in the network, all packet switching network is a perfect choice for this kind of network: 

NR8120/NR8150/NR8250 is deployed at terminal or repeater site to emulate TDM circuit into Ethernet



98

NR8250 is deployed at BSC/RNC site to re-create TDM circuit.

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ZXMW NR8250 Product Description

Figure 5-23

All-Packet switching network scenario

E1

Microwave

RNC

Fiber BTS/Node B FE

GbE

GbE

Ethernet

aGW

IP/MPLS GbE

FE/GbE

E1 /STM-1

BSC

Government CESoETH

IP/MPLS

CESoETH

All Packet Circuit emulation is also used for hybrid traffic passing through third party PSN (packet switch network), as shown in Figure 5-24, native TDM & Ethernet traffic is switched in hybrid microwave network separately and simultaneously. At aggregation site, TDM circuit is emulated into Ethernet by NR8250, and then passed through the PSN. At the far end, NR8250 will re-create the TDM circuit.

Figure 5-24

E1

BTS/Node B FE

CES for mixed network scenario

Microwave

RNC GbE

GbE

Hybrid E1 /STM-1

E1

aGW

GbE

PSN

BSC GbE

E1 /STM-1

BTS

Native TDM & Ethernet

Hybrid

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CESoETH

CESoETH

All Packet

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ZXMW NR8250 Product Description

6

Performance and Parameters Detail parameters of the above features and hardware are specified in this chapter.

6.1

System Integrity These parameters are the basic physical description of the NR8250 system.

6.1.1

Mechanical Characteristics Table 6-1 shows the dimensions and weights of IDU, ODU.

Table 6-1

Dimension and weight Item

Dimension (mm)

IDU

Weight (kg)

482.6 (W) × 90 (H) ×199 (D)

7 (Fully equipped)

SRU

245.5 (W) × 261.7 (H) × 87.0 (D)

4.0

HRU

248 (W) × 275 (H) × 123 (D)

5.5

ODU

6.1.2

Operation Parameters The operation parameters include power supply, temperature, humidity and power consumption.

Table 6-2

Power supply

Power Module

Description

PM

-48 V DC (-60 ~ -40 V DC)

PM input voltage range.

RPUA

-48 V DC (-60 ~ -40 V DC)

RPUA input voltage range.

RPUC

-48 V DC (-60 ~ -40 V DC)

RPUC input voltage range.

Table 6-3

Temperature and humidity Item

Workable Temperature

100

Input Voltage

IDU

ODU

-30°C ~ 65°C

-40°C ~55°C

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ZXMW NR8250 Product Description

Item

IDU

ODU

Guaranteed Temperature

-25°C ~ 55°C

-33°C ~ 55°C

Transportation/Storage Temperature

-40°C ~ 70°C

-40°C ~ 70°C

Humidity

< 95% (35°C)

< 100%

Alarm: It is prohibited to touch the equipment when the operation environment temperature is higher than +55℃.

Table 6-4

Module power consumption

Board

Power Consumption (Max.)

Remarks

Operation Environment: 25℃ RCUB

25 W

@ Maximum throughput

RCUC/RCUC2

26 W

@ Maximum throughput

RMUC

24 W

@ Maximum throughput

RMUD

19 W

@ Maximum throughput

RMUE

23 W

@ Maximum throughput

RMUH

22 W

@ Maximum throughput

RMUF

29 W

@ Maximum throughput

RTUA

5W

@ Fully loaded

RTUB

13 W

@ Fully loaded

RTUC

17 W

@ Fully loaded

RTUD

10 W

@ Fully loaded

RTUE

16 W

@ Fully loaded

RTUNO

13 W

@ Maximum throughput

RTUNE

14 W

@ Maximum throughput

RTUNP

11 W

@ Maximum throughput

RPEA

11 W

@ Maximum throughput

RTUHO

14 W

@ Maximum throughput

RTUHE

14 W

@ Maximum throughput

RTUIO

16 W

@ Maximum throughput

RSUA

5W

@ Fully loaded

PM

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0.075×(RCUs+RMUs+RTUs +RFAB)

@ Fully loaded

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ZXMW NR8250 Product Description

Board

Power Consumption (Max.)

Remarks

Operation Environment: 25℃ RPUA

6W

@ Fully loaded

RPUC

12 W

@ Fully loaded 7 W @ Low speed

RFAB

10 W

10 W @ Normal speed 17 W @ Fast speed 31 W @ Full speed

27 W (7/8/13/15/23/38/42 GHz) SRU ODU

29 W (28/32 GHz)

@ Maximum transmit

30 W (10/11/18/26 GHz)

power

34 W (6 GHz) HRU

50 W (6/7/8/11 GHz)

@ Maximum transmit power

Notes: 1.

The actual power consumption is less than the maximum value.

2.

The power consumption of RPUA/RPUC/PM/RFAB depends on the number of radio directions, service boards and temperature.

Table 6-5

System power consumption per site (SRU)

Item

Configurations

Power Consumption (reference value)

Operation Environment: 25°C 1+0, 16×E1: 1

1×RCUB+1×PM3+1×RPUA+1×RFAB+1×RTUA

100 W

+1×RMUE+1×SRU (15 GHz) 2+0, 8×E1+3×GbE: 2

1×RCUB+1×PM3+1×RPUA+1×RFAB+1×RTUHO

158 W

+2×RMUH+2×SRU (15 GHz) 1+1, 8×E1+3×GbE: 3

1×RCUB+1×PM3+1×RPUA+1×RFAB+1×RTUHO

150 W

+2×RMUE+2×SRU (15 GHz) 4

102

4+0, 2×STM-1+8*E1+4×GbE:

270 W

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ZXMW NR8250 Product Description

Item

Configurations

Power Consumption (reference value)

Operation Environment: 25°C 1×RCUB+1×PM3+1×RPUA+1×RFAB+1×RTUB+1 ×RTUNO+4×RMUH+4×SRU (15 GHz) 6+0, 8×E1+3×GbE: 5

1×RCUB+2×PM3+1×RPUA+1×RFAB+1×RTUHO

380 W

+6×RMUH+6×SRU (15 GHz)

6.1.3

Standards Compliance Table 6-6

Complied standards

Specifications

IDU EN 301 489-1 EN 301 489-4

EMC

IEC 61000-4 EN 55022/CISPR22

EN 301 489-4 IEC 61000-4 EN 55022/CISPR22

Safety

IEC 60950

IEC 60950

Shell Protection

IEC 60529 IP20

IEC 60529 IP65

Operation

ETSI EN 300 019-1-3

ETSI EN 300 019-1-4

Storage

ETSI EN 300 019-2-1

ETSI EN 300 019-2-1

Transport

ETSI EN 300 019-2-2

ETSI EN 300 019-2-2

GR-63-CORE – 1995,

Noise

6.1.4

ODU

ETSI EN 300 753 5.2

N/A

Fault Tolerance MTBF/MTTR Fault tolerance parameters include Residual Bit Error Ratio (RBER), Mean Time To Repair (MTTR) and Mean Time Between Failures (MTBF) -12



RBER