03_FA31323EN32GA0_fmx2.pdf
April 16, 2017 | Author: Amina Wedwed | Category: N/A
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FMX2
FMX2
Contents 1 1.1 1.2 2 3 4 5 5.1 5.2 5.3 5.4 6 7 7.1 7.2 8 9
FMX2R3 interfaces External interfaces Internal interfaces FMXII SISA Structure FMXII Functional View FMXII network structures FMXII operating modes Terminal Multiplexer TMX30 Terminal Multiplexer TMX2x30 Terminal Multiplexer TMX30(1+1) Drop/Insert-Multiplexer DIMX Channel conferencing modes of the CUD in DIMX-mode FMX2R3 additional features End to end nx64kbps channel protection ADPCM in FMXIIR3 Exercise Solution
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MX2R3 structure and components The system module FMX is responsible for the following tasks :
• Multiplex functionality • Provision of analog to digital subscriber interfaces • Control and signaling for the subscriber interfaces The control and signaling of these interfaces is done by means of the CAS signaling. Depending on the configuration, the FMX can be configured as terminal multiplexer or drop insert multiplexer. On the network side system module FMX is equipped with two 2-Mbit/s interfaces in accordance with ITU-T G.703. The central functions in the FMX are handled by a central unit drop insert CUD. Up to six line cards can be equipped to provide various range of subscriber interfaces. Additionally, SUE card provides supervision and management of the system.
LC#1
2 Mbps CAS
Sub
. . .
CUD 2 Mbps CAS
LC#6
SUE
Fig. 1 FMX Functional Overview
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The following line cards are available in the FMX2R3 family:
• A central unit drop/insert CUD • Up to 6 line cards LC, of the following types: Analog SUB102C
subscriber converter, a/b wire, subscriber 10 ports per card side
SLX102C
subscriber converter, a/b wire, switching side
10 ports per card
SLB62
subscriber converter for local battery, a/b wire
6 ports per card
UAC68
universal analog line card, 2/4-wire leased lines or with E&M
6 ports per card
SEM106
2-wire E&M converter)1)
10 ports per card
SEM108H
4-wire E&M converter1)
LLA102/104C
Line card for analog 2-wire/4-wire leased lines 1)
10 ports per card
I8S0P
ISDN line card, S0 interface
8 ports per card
IUL82(C)
ISDN line card, Uk0 interface 2B1Q
8 ports per card
I4UK2NTP
ISDN line card, Uk0 interface 2B1Q, switching side
4 ports per card
IUL84
ISDN line card, Uk0 interface 4B3T
8 ports per card
I4UK4NTP
ISDN line card, Uk0 interface 4B3T, switching side
4 ports per card
DSC104CO
digital signal channel, 64 kbit/s, codirectional, G.703 interfaces
10 ports per card
DSC6-n×64G
digital signal channel, n × 64 kbit/s, G.703 interfaces
6 ports per card
CPF2
digital signal channel with maximum of 4 interface modules for various interfaces
4 submodules per card
• CIM
1 port per module
Customer
subrates up to 31 × 64 kbit/s, V.24/V35/V36/RS530 or X.21,Ethernet
Interface modules
- protocol conversion X.50/X.51 to X.30/V.110/I.460
ISDN
Digital Services
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CM64/2
digital signal card, 2 Mbit/s channel multiplexer, G.703
1 port per card
DSC8V24
(digital signal channel, n ≤ 19.2 kbit/s, V.24 interfaces)1)
8 port per card
DSC8X21
(digital signal channel, n ≤ 64 kbit/s, X.21 interfaces)1)
8 port per card
BEC
Optionally, a bus extension card BEC can be used instead of a line card, if up to 12 line cards are connected to the CUD2). 1) only in MXS19 shelf 2) only possible in the shelves FMX2S and MXS19
Fig. 2 FMX2R3 Overview
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FMX2R3 interfaces
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1.1
External interfaces
F1 Interfaces The F1 interfaces are on the CUD central unit drop/insert and conform to ITU-T Recommendation G.703. Each F1 interface has a transmission rate of 2 Mbit/s. By setting a switch, the interface can be terminated as desired with 120 Ω or 75 Ω. F2/D2 Subscriber Interfaces The F2/D2 subscriber interfaces are provided by the line cards. They are used to connect analog, digital and ISDN subscribers. The number of subscriber interfaces for each LC card type is different. T3 Interface The T3 interface is implemented by the central unit and conforms to ITU-T G.703/10. An external 2048-kHz clock is fed in via the T3in interface. The interface can be set to high or low resistance by a switch. The 2048-kHz clock, which is derived from the appropriate clock source, is output at the T3out interface. QD2 Interface The QD2 interface of the multiplexer is on the central unit and conforms to EIA RS485. It is in the form of a slave interface (QD2-S), and implements access to the FMX2R3 network element and to remote network termination units. ZA(A) and ZA(B) Interface The interface signals an alarm in the direction of the central service observation equipment. The ZA(A) interface is in the form of a normally closed contact. At the normally closed contact ZA(A), either A alarm (urgent) or S alarm (service) is output, and for both cases failure of the operating voltage. The ZA(B) interface is in the form of a normally open contact. It is used to signal B alarm (non-urgent). Interface of ECC Via the ECC interface of the CUD, a control signal can be derived from any timeslot of one of the F1 ports and inserted in the opposite direction. This timeslot can then no longer be used for information transmission. The ECC interface conforms to ITU-T Recommendation V.11.
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FMX2
Sa Bit Interfaces The Sa bit interfaces are designed according to the interface conditions of EIA RS485. Four Sa bit interfaces, Sa5 to Sa8, are available on the CUD. One symmetrical signal line for the sending direction and one for the receiving direction can be connected for each Sa bit. The transmission speed is 0.6 kbit/s (signal distortion about 15 %) to 1.2 kbit/s (signal distortion about 30 %). The following options for the data paths are available for all Sa bits on the CUD unit: • Source for F1Aout: low-level / high-level / Sa*in / F1Bin / Sa*in ANDed with F1Bin, • Source for F1Bout: low-level / high-level / Sa*in / F1Ain / Sa*in ANDed with F1Ain, • Source for Sa*out: low-level / high-level / high-resistance / F1Ain / F1Bin / F1Ain ANDed with F1Bin. At the 64 kbit/s bit rate, no transparent data transmission is possible. The data signal must be transmitted using HDLC frames. If the option of frame synchronization of the CUD is used, the Sa bits are not available as a transmission channel. They are permanently set to “1” in the sent signal. The Sa bit interfaces are switched to high-resistance.
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Fig. 3
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1.2
Internal interfaces
System Bus The system bus is subdivided into the PCM highway and the LC bus. The line cards also receive their power supply via the system bus. PCM Highway The PCM highway forms the interface between the central unit and the various line cards for serial transmission of data channels and PCM-coded speech signals. The sending and receiving signals of the PCM interface are synchronized by the same clock, but can be in any phase position in relation to each other as far as the frame clock is concerned. Both signal flow directions keep their own frame synchronization pulse. LC bus The LC bus is an 8-bit computer bus for transmission of control and signaling data between the central unit and the LCs. The interface works on the master-slave principle, i.e. the central unit is the master and the LCs are the slaves. Irrespective of the division in the subrack, up to 12 line cards can be operated every 4 ms with one CUD central unit drop/insert. Test and Measurement bus Via the test and measurement bus, measurements on the subscriber lines and/or ports of selected line cards within an SNU can be carried out. The measurements are done in the system module COMPS2. Connecting the line cards to the test and measurement bus is controlled exclusively via the supervision unit OSU of COMPS2. Multiplexers which are controlled via an additional supervision unit cannot be measured.
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FMX2
2
FMXII SISA Structure
In the FMX2S_shelf there are maximum two FMXX2 systems. The first Module is always the SUE supervision unit to make the communication between the whole shelf and the management system. The first FmX2 starts in slot 2 and the second one in slot 9 (check also the SISAaddress in the DCN-view.
Fig. 4
The SUE is shown in the DCN View as virtual note SISA V/LMX (LMX means software download to this network element is possible). The second part of the SUE is the icon for the 8 external Alarms connected direct to the SUE : SISA ASA (ASA-K) means Alarm Collector (Alarmsammler)
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FMX2
SUE
CUD Firmware (new CUD without SW)
Alarm collector: 8 external alarms Fig. 5
The SUE has two further slaves: the 2 FMX2 systems started with a SISA V/LMX for the CUD Firmware. TIP A NEW CUD WITHOUT LOADABLE SOFTWARE WILL BE SHOWN ONLY AS SISA V After software download the multiplexer n*64 kbps to 2Mbps will occur.
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FMX2
3
FMXII Functional View
The functional view shows the logical information flow through the FMXII from the 2 Mbps G703 electrical ports to the data interfaces.
Fig. 6
EPPM64/2M #1 and #2: electrical 2Mbps ports A an B
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FMX2
FU
Description
Remark
EPPM64/2
Electrical Plesiochronous Multiplex Port 64 kbit/s/2 Mbit/s
Electr. 2M Ports A and B
ICBD
Internal Conference Block digital
conference blocks for Timeslots 1 to 31
BPX64
Bottom Path Connection 64 kbit/s
64 kbps crossconnector
KZU
KZU Access Interface
analog ports of SLX and SUB analog Ports of UAC
KZU
16
assignment of D-Channels for ISDN
SUBMUX
Assignment for Connections
ISDN
ISDN Access Interface
IIF64
Internal Interface 64 kbps
DSKnx64
Digital Access Interface nx64 kbps ports of DSC10C, DSC6 n*64G
FLEXnx64
Digital Access Interface nx64 kbps CIM-IF of CPF2
SISA0
SISA-0 (Management of the QD2 interface)
PET
Plesiochronous Equipment Timing
Synchronization sources 1 to 8
MEL
Message Input (digital input group with 32 Bit)
external alarms
ECC Ports #2 and #3 of CUD, ECC#1 of SUE
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
ICBD#1:1 0
1
1:=A
2
ICBD#31:1 15 16 17
30 31
A B
ICBD#1:33 0
1
2
33:=B 15 16 17
ICBD#31:33 30 31
Fig. 7
TIP The ICBD gives the conference for the timeslots 1 to 31. If a port of a LC is connected to a time slot on A or B is given by the number 1 for A and 33 for B.
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FMXII network structures
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FMX2
The FMX2 system is used to build up private networks as access multiplexers inside public networks. The TMX30, TMX2x30 and DIMX multiplexers and CC64K cross-connect can be combined in different ways. The multiplexer's operating modes are implemented by central units and CUD. The CUD central unit has two F1 ports. Changeover between operating modes is implemented via the operating program by menu selection. It is possible to implement the following structures, which can be linked to each other arbitrarily:
• line-type, • intermeshed, • star-shaped or • ring-shaped. Applications: Operating mode
Central Unit
Abbreviation
TMX30
Central Unit
CUD
TMX2x30
Central Unit Drop Insert
CUD
TMX30(1+1)
Central Unit Drop Insert
CUD
DIMX
Central Unit Drop Insert
CUD
Application options
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FMX2
The following diagrams show examples of FMX2 applications.
Mirror multiplexer CU, OF, voice
HDSL
MUX
voice MUX
data
data TMX30
ISDN data
TMX2x30
NTU
2 Mbps 2 x 2 Mbps
TMX30
ISDN
TMX2x30
NTU
data
Fig. 8 FMXII a mirror multiplexer configuration
Line - type network voice data ISDN
MUX
CU, OF, HDSL
TMX30
MUX
CU, OF, HDSL
TMX30
DIMX 2 Mbps
2 Mbps
NTU
MUX
voice data ISDN NTU
U NT
voice data ISDN
Fig. 9 FMXII in a line-type network configuration
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FMX2
Branched network synchronous multiplexers
MUX 1
. . .
CC64K
. . .
DIMX
20
MUX TMX30 TMX2x30
CU, OF, HDSL
CC64K
CC64K
MUX
MUX
DIMX
DIMX 2 Mbps 2x2 Mbps
2 Mbps 2x2 Mbps
1 2-Mbps-Lines
CU, OF, HDSL
. . .
CC64K
MUX TMX30 TMX2x30
. . 2-Mbps-Lines . 20
Fig. 10 FMXII/CMX in a branched network configuration
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FMX2
Access line multiplexer
CU MUX
EX
voice TMX30
ISDN
# 2 Mbps
TMX2x30
Fig. 11 FMXII in a AccessLine multiplexer configuration
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FMX2
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FMX2
5
FMXII operating modes
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
25
FMX2
5.1
Terminal Multiplexer TMX30
TMX30 is a multiplexer operating mode in which a maximum of 30 time slots inside the 2 Mbps signal are seized by the LC F2 signals in the transmit direction. If no signaling flags are transmitted (CAS deactivated), a maximum of 31 channels are available for data transmission (no voice processing in this special case). In the receive direction the 2 Mbps signal is distributed to the 30 (31) LC F2 signals.
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FMX2
Functional diagram
LC
F1in
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F2
CUD
F1
LC
F1out
Fig. 12 Terminal Multiplexer TMX30
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FMX2
5.2
Terminal Multiplexer TMX2x30
In the multiplexer operating mode TMX2x30 it is possible to distribute a maximum of 60 signals in the transmit and receive direction from the LCs to ports F1A and F1B and to transmit and send these signals as 2 Mbps signals using 30 channels each on F1A and F1B. If no signaling flags are transmitted (CAS deactivated), a total maximum of 62 channels are available.
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FMX2
Functional diagram
F1in F1A
LC
F1out
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F2
CUD
LC
F1in F1B F1out
Fig. 13 Terminal Multiplexer TMX2x30
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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FMX2
5.3
Terminal Multiplexer TMX30(1+1)
The multiplexer operating mode TMX30(1+1) is used for protection switching of 2 Mbps transmission routes. Signals from a maximum of 30 (31) channels are transmitted simultaneously (in parallel) via both ports of the CUD. After detection of a fault in the standard route, a changeover to the secondary route occurs within 10 ms without requiring any changes e.g. channel initialization data. This means, existing connections remain unaffected. If a high priority alarm is activated at one port and a lower priority alarm is activated at the same time at a different port, the port with lower priority will be used as the transmission path. There are two operation principles to choose from:
• non-reverted mode If changeover from the standard route to the secondary route occurs as a result of a fault, automatic switch back will not occur after clearing the fault.
• reverted mode If changeover from the standard route to the secondary route occurs as a result of a fault, switchback to the standard route occurs automatically after the fault is cleared.
TIP This mode is used if two routes are available joining 2 different sites. It will not make any sense to use this mode and transmit both E1 over the same physical carrier (e.g. optical fiber of SDH ring).
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
Functional diagram
F1 in LC
F1 out
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F2
F1 out ACT
F1
CUD
LC
LC
F1 in
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CUD
F1 in
LC
F1 out STB
F1 out
F2
F1 in
Fig. 14 Terminal Multiplexer TMX30(1+1)
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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FMX2
5.4
Drop/Insert-Multiplexer DIMX
In the DIMX mode, the 2 Mbps signals are through-connected from port to port and it is possible to branch and reinsert a maximum of 30 channels from each of the two transmission directions including the corresponding sections in time slot 16 (CAS signaling in case of telephony channels for POTS or ISDN subscribers). In this way it is possible to drop/insert up to a maximum of 60 channels. Channels that are not dropped are through-connected from port to port.
TIP The default status of the channels in this mode is the "blind" through-connection from port to port. No time slot is dropped, till user configures it.
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
Functional diagram
F1 in
F1 out
CUD
F1
F1 F1 out
F1 in
F2
F2 LC
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LC
Fig. 15 Drop/Insert-Multiplexer DIMX
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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FMX2
34
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FMX2
6
Channel conferencing modes of the CUD in DIMX-mode
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
35
FMX2
Any channel (time slot) of the 2Mbit/s of the CUD can be operated in 9 different modes:
• Through connecting of a time slot (FM without LC): if this is applied to all TS, the DIMX becomes a regenerator
• Dropping and inserting a 64kbit/s channel (A and B) • Full conference (FM with LC) • point to multipoint with the TS from F1A being the point (A:MP) • point to multipoint with the TS from F1B being the point (B:MP) • point to multipoint with the port of the line card being the point (LC:MP) • Broadcasting with the TS from F1A being the source (A:BC) • Broadcasting with the TS from F1B being the source (B:BC) • Broadcasting with the port of the line card being the source (LC:BC)
Fig. 16
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
CUD F1Bout
F1Ain Port F1A
Port F1B
F1Aout
F1Bin
Through switching of a 2-Mbit/s signal
CUD F1Bout
F1Ain Port F1A
Port F1B
F1Aout
F1Bin
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PCM-E
PCM-S
Dropping and inserting and iserting 64-kbit/s signal
Fig. 17
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FMX2
CUD
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F1Ain
F1Bout
Port F1A
Port F1B
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F1Bin
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PCM-S
Digital conferencing
CUD F1Bout
F1Ain Port F1A
Port F1B
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PCM-E
F1Bin
PCM-S
Point (port F1A)-to-multipoint
Fig. 18
CUD
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F1Bout
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Port F1B
F1Aout
F1Bin
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PCM-S
Point (port F1B)-to-multipoint
CUD F1Bout
F1Ain Port F1A
Port F1B
F1Aout
F1Bin
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PCM-S
Point (time slot)-to-multipoint
Fig. 19
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
CUD F1Bout
F1Ain Port F1A
Port F1B
F1Aout
F1Bin
PCM-E
PCM-S
Broadcasting with F1A as a point
CUD F1Bout
F1Ain Port F1A
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F1Aout
F1Bin
PCM-E
PCM-S
Broadcasting with F1B as a point
Fig. 20
CUD F1Ain
F1Bout
Port F1A
Port F1B
F1Aout
F1Bin
PCM-E
PCM-S
Broadcasting with a time slot as a point
Fig. 21
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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FMX2
40
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
7
FMX2R3 additional features
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
41
FMX2
7.1
End to end nx64kbps channel protection
The multiplexer can carry out automatic changeovers between the normal and protection paths according to internal changeover criteria (protection state: auto). Automatic changeover is possible only for the UAC68 and CPF2 units. A manual changeover from the normal to the protection path and vice versa is also possible in the auto protection state. In this case the path to which the changeover occurs must be fault-free. The protection state is not affected by a manual changeover. The protection states “normal path forced active” and “protection path forced active” are also possible. The line card is assigned double the transmission capacity, a normal path and a protection path, both with the same authorizations, in the transmission network. In the direction from the transmission network to the subscriber interface, the subscriber port determines the availability of the current transmission link or both transmission links, and specifies the transmission link to be used. Non-revertive protection mode is used, meaning that when the normal path is disturbed the system changes over to the protection path if this path is fault-free. A reverse changeover occurs if there is a fault on the protection path, and the normal path is fault free. For digital signals, protection switching also occurs in the following cases: • Single port with subrate transmission • Single port with ≥ 64-kbit/s data transmission • Multiport with n x 64-kbit/s data transmission. If ADPCM is used, no protection path can be set up.
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FMX2
Fig. 22 End to end nx 64kbps channel protection
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FMX2
7.2
ADPCM in FMXIIR3
This compressed coding of 64kbit/s channels into 32kbit/s is only available for UAC68 card. Using the ADPCM, no channel protection is possible. This feature enables the transport of two analogue VF signals originated in two ports of the card into one 64kbit/s channel of the 2 Mbit/s
TIP The ADPCM is not available with the SUB102 or SLX102 cards. This means, no ADPCM for telephony. Please note, that this art of voice compression applies only in the following interfaces (those of the UAC68 card):
• Leased line 2 wires • Leased line 4 wires • E&M 6 wires • E&M 8 wires.
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
Cross-connections
ADPCM1
ADPCM2
64kbit/s channel KZU2#1 2Mbit/s frame 1
7
16
31
KZU2#4
UAC68
Fig. 23 Occupation of ADPCM channels
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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FMX2
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
8
Exercise
1. What are the components of FMX2R3? 2. Which network structures can be implemented? 3. Which operating modes of the FMXII can be configured? 4. What shelves can accommodate the FMX2R3? 5. What are the main differences between SNUS shelf and FMX2S shelf? 6. What is the maximum number of line cards, that can be assigned to an FMXII? 7. How many line cards can be placed in an SNUS shelf? 8. How many line cards can be placed in an FMX2S shelf?
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
47
FMX2
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
FMX2
9
Solution
1. What are the components of FMX2R3?
• central unit • line card • supervision unit 2. Which network structures can be implemented?
• line-type, • intermeshed, • star-shaped or • ring-shaped. 3. Which operating modes of the FMXII can be configured?
• Terminal multiplexer TMX30 TMX2x30 TMX30(1+1)
• Drop/Insert-Multiplexer DIMX 4. What shelves can accommodate the FMX2R3?
• MSX19 for Multiplexer and Line-equipment • FMX2 for Multiplexer and Line-equipment • SNUS for Cross-connect, Multiplexer and Line-equipment
FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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FMX2
5. What are the main differences between SNUS shelf and FMX2S shelf?
• SNUS accommodates multiplexer, cross connect as well as transport • FMX2S accommodates up to two multiplexers only 6. What is the maximum number of line cards, that can be assigned to an FMXII? 12 7. How many line cards can be placed in an SNUS shelf? 6 8. How many line cards can be placed in an FMX2S shelf? 12
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FA31323EN32GLA0 © 2009 Nokia Siemens Networks
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