02 SkyEdge II System Introduction v6.1

July 11, 2017 | Author: Nelson Quispe Aduviri | Category: Forward Error Correction, Very Small Aperture Terminal, Network Topology, Voice Over Ip, Computer Network
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SkyEdge II System Introduction

Agenda System Introduction System Entities Network Topology Network Architecture

Satellite Segment System Capabilities

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SkyEdge II Introduction System Introduction SkyEdge II is a modular two-way satellite communication system Allows connection between several remote terminals to the Internet/Extranet or to each other SE II system has three main components The Hub, satellite/transponder and remote terminals

Supports two types of transmissions Inbound are all the transmissions from the remote terminals to the HUB Outbound are all the transmissions from the Hub to the remote terminals

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SkyEdge II Introduction System Entities Satellite (Transponder)

Inbound (IB)

Outbound (OB) Remote Terminals SEII HUB 4

SkyEdge II Introduction System Entities Remote Terminal In Door Unit (IDU) – VSAT Out Door Unit (ODU) - Antenna Dish, Linear BUC and LNB Hub Center of the SEII system

Responsible for two main functions: Manages & control the network elements Aggregate & distribute IB & OB IP traffic

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SkyEdge II Introduction Network Topology SkyEdge II hub enables system VSATs to communicate via satellite links: Internet/Intranet networking (VSAT-to-Hub). Each other (VSAT-to-VSAT). System development road-map offers three basic topologies: Star (v6.0)

Star with Terrestrial Interface (v6.1) Star with Mesh Interface (v6.2)

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Network Topology Star Topology Each VSAT has a Satellite Interface (SI) which enables it to communicate throughout the Hub to the internet\intranet (single hop) or to another VSAT (double hop)

Star Topology

Internet

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Network Topology Star + Terrestrial Interface The system also enables each VSAT to have a Terrestrial Interface (TI) as an add-on to the VSAT.

Dial-up, DSL, etc.

Terrestrial Network

Star Topology + Terrestrial Interface Internet

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Network Topology Star + Mesh (v6.2) In Mesh connectivity data is directly transferred between VSATs, while channel allocation and network management is done via the Hub.

Star Mesh

Mesh

Internet

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SkyEdge II Introduction Network Architecture The SEII hub consists of one up to five Network Segments (NS) A NS is a subnetwork that manages three physical subsystems Inbound Subsystem (IBSS) Demodulates and Decodes the traffic coming from the VSATs (Inbound) Outbound Subsystem (OBSS) Multiplexes and Modulates the traffic towards the VSATs (Outbound) Application Subsystem (AppSS)

Provides means to distribute traffic to or from the Internet/Intranet and optional QoS services.

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SkyEdge II Introduction Network Architecture (cont’d) Radio Frequency Transceiver (RFT) SEII supports C-band, Ext. C-band and Ku-band (Ka-band in the future) SEII system uses L-band for both IB and OB Hub Applications/Add-ons Shared by all the NS Includes: Internet Page accelerator (IPA) L-band to IF and IF to L-band converters Network Management System (NMS) Facilitates management, control, configuration, monitoring and operation of the

system

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Network Architecture Block Diagram

Remote Unit

HUB

VSAT

ODU VSAT

RFT

ODU

Tx + Rx + ref ( L Band )

ODU

Tx + Rx + ref ( L Band )

IDU

NS1

Tx + Rx + ref ( L Band )

IDU

NS2

IDU

NS3

NMS

NS4 NS5 Tx (L Band )

Customer LAN

Rx ( L Band )

OBSS

IBSS

AppSS

HUB Applications \ Add - ons

Internet / Intranet Border Router

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SkyEdge II Introduction Outbound – General Description Carries Unicast and Multicast data, VoIP traffic, synchronization information for the return (Inbound) channel and network control traffic The VSATs recognize and extract the traffic which is intended for them It is based on DVB-S2 (EN 302 307) standard Supports two operation modes CCM and ACM Constant Coding Modulation (CCM) MODCOD (modulation and FEC (Forward Error Correction)) is constant Adaptive Coding and Modulation (ACM) MODCOD (modulation and FEC) differ on a frame to frame basis Modulation Schemes: QPSK, 8PSK, 16APSK and 32APSK Enhanced FEC mechanisms

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SkyEdge II Introduction Outbound – DVB-S2 ACM

8PSK 5/6

DVB-S2 ACM

QPSK 2/3

8PSK 3/4

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SkyEdge II Introduction Inbound – General Description The IB channel carries

User traffic, VSAT initial logon, maintenance information and capacity requests Based DVB-RCS standard (EN 301 790) Uses (Multi-Frequency Time-Division Multiple Access) MF-TDMA Reservation based access scheme

Reservation Only! No contention… The IB burst allocation plan is broadcast within the DVB-S2 OB channel. Modulation Schemes QPSK and 8PSK Multiple Carrier types (CT)

A Carrier Type is a combination of one symbol rate and a mix MODCODs Each CT has it own Time Slot (TS) Mapping structure

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SkyEdge II Introduction Inbound – Carrier Types Carrier Type

Symbol Rate

CT- 4 CT-3

MODCOD MIX Modulation

FEC

Percentage

512

8PSK

3/4

100%

256

QPSK

3/4

75%

QPSK

6/7

25%

CT-2

192

QPSK

3/4

100%

CT-1

128

QPSK

1/2

100%

Freq CT- 4 CT- 3

CT- 3 CT- 2 CT- 1

Time

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System Capabilities Up to Five Network Segments (NS) 32000 VSATs per Hub Outbound capacity: Up to 135 Mbps per NS Up to 300 Mbps per Hub Total Inbound capacity Up to 75 Mbps per NS Up to 150 Mbps per Hub

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Application Enhancements Enhanced Data-Com & IP features for full flexibility: RIP1&2, IRDP, NAT, DHCP, IGMP, VRRP, IP prioritization, ACL, etc. Embedded TCP spoofing Embedded VPN & traffic Encryption/Compression Embedded Application Acceleration – HTTP/S, VPN, CIFS, NTLM, CRTP

VoIP – ATA, IP phones, VoIP GW, SSW, etc Telecom Backhaul – GSM, CDMA, DCME. IB QoS - DiffServ, MPN, VSAT priority Optional OB QoS – Server Optional Network Traffic Analyzer (NTA) Support Prepaid IP Support of external applications

Any commercial IP based applications 18

VSAT Network Solutions Air Traffic Control

Inventory Management

Internet Access

Kiosks/Internet Cafe

ATM

Military

Point of Sale (POS)

Oil & Gas

Corporate Communications

Post Office

Corporate Telephony

Corporate Telephony

Credit Authorization

Prepaid IP

E-learning

Rural Telephony

E-Voting

SCADA/Line Monitoring

Global Area Networking

Transportable VSATs

GSM Satellite Backhaul expansion

Video Surveillance

Interactive Distance Learning

Wi-Fi / Wi-Max hotspots

Intranet/Extranet

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Test Your Knowledge 1.

Which topology is supported in SEII? ____________________________________

2.

What is a MODCOD? ________________________________________________

3.

What is the maximal number of Network Segments in the system? _____________

4.

What is a Carrier Type? _______________________________________________

5.

What is the IBSS function? _______________________________________

6.

What is the AppSS function? ______________________________________

7.

What is ACM? _______________________________________________________

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The End

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