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3

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 multiplexeror drop insert multiplexer. On the network side system module FMX is equipped withtwo 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 tosix line cards can be equipped to provide various range of subscriber interfaces.

Additionally, SUE card provides supervision and management of the system.

CUD

LC#6

.

.

.

LC#12 Mbps

CAS

Sub

SUE

2 Mbps

CAS

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, subscriberside

10 ports per card

SLX102C subscriber converter, a/b wire, switchingside

10 ports per card

SLB62 subscriber converter for local battery, a/bwire

6 ports per card

UAC68 universal analog line card, 2/4-wireleased 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 converter 1)

LLA102/104C Line card for analog 2-wire/4-wire leasedlines 1)

10 ports per card

ISDN

I8S0P ISDN line card, S0 interface 8 ports per card

IUL82(C) ISDN line card, U k0 interface 2B1Q 8 ports per card

I4UK2NTP ISDN line card, U k0 interface 2B1Q,switching side

4 ports per card

IUL84 ISDN line card, U k0 interface 4B3T 8 ports per card

I4UK4NTP ISDN line card, U k0 interface 4B3T,switching side

4 ports per card

DigitalServices

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 4interface modules for various interfaces

4 submodules per card

CIMCustomer

Interfacemodules

subrates up to 31 64 kbit/s,V.24/V35/V36/RS530 or X.21,Ethernet

- protocol conversion X.50/X.51 toX.30/V.110/I.460

1 port per module

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CM64/2 digital signal card, 2 Mbit/s channelmultiplexer, 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.21interfaces) 1)

8 port per card

BEC Optionally, a bus extension card BECcan be used instead of a line card, if upto 12 line cards are connected to theCUD 2).

1) only in MXS19 shelf2) only possible in the shelves FMX2S and MXS19

Fig. 2 FMX2R3 Overview

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1 FMX2R3 interfaces

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1.1 External interfaces

F1 InterfacesThe F1 interfaces are on the CUD central unit drop/insert and conform to ITU-TRecommendation G.703. Each F1 interface has a transmission rate of 2 Mbit/s. Bysetting a switch, the interface can be terminated as desired with 120 or 75 .

F2/D2 Subscriber Interfaces

The F2/D2 subscriber interfaces are provided by the line cards. They are used toconnect analog, digital and ISDN subscribers. The number of subscriber interfacesfor 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 setto high or low resistance by a switch. The 2048-kHz clock, which is derived from theappropriate clock source, is output at the T3out interface.

QD2 Interface

The QD2 interface of the multiplexer is on the central unit and conforms to EIARS485. It is in the form of a slave interface (QD2-S), and implements access to theFMX2R3 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 observationequipment. The ZA(A) interface is in the form of a normally closed contact. At thenormally 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 formof 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 timeslotof one of the F1 ports and inserted in the opposite direction. This timeslot can then nolonger be used for information transmission. The ECC interface conforms to ITU-TRecommendation V.11.

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Sa Bit Interfaces

The Sa bit interfaces are designed according to the interface conditions of EIARS485. Four Sa bit interfaces, Sa5 to Sa8, are available on the CUD.

One symmetrical signal line for the sending direction and one for the receivingdirection 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 notavailable as a transmission channel. They are permanently set to 1 in the sentsignal. The Sa bit interfaces are switched to high-resistance.

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1.2 Internal interfaces

System BusThe system bus is subdivided into the PCM highway and the LC bus. The line cardsalso receive their power supply via the system bus.

PCM Highway

The PCM highway forms the interface between the central unit and the various linecards for serial transmission of data channels and PCM-coded speech signals.

The sending and receiving signals of the PCM interface are synchronized by thesame clock, but can be in any phase position in relation to each other as far as theframe clock is concerned. Both signal flow directions keep their own framesynchronization pulse.

LC bus

The LC bus is an 8-bit computer bus for transmission of control and signaling databetween the central unit and the LCs.

The interface works on the master-slave principle, i.e. the central unit is the masterand the LCs are the slaves. Irrespective of the division in the subrack, up to 12 linecards 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/orports of selected line cards within an SNU can be carried out. The measurements aredone in the system module COMPS2.

Connecting the line cards to the test and measurement bus is controlled exclusivelyvia the supervision unit OSU of COMPS2. Multiplexers which are controlled via anadditional supervision unit cannot be measured.

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2 FMXII SISA Structure

In the FMX2S_shelf there are maximum two FMXX2 systems. The first Module isalways the SUE supervision unit to make the communication between the whole shelfand the management system.

The first FmX2 starts in slot 2 and the second one in slot 9 (check also the SISA-address in the DCN-view.

Fig. 4

The SUE is shown in the DCN View as virtual note SISA V/LMX (LMX meanssoftware download to this network element is possible). The second part of the SUEis the icon for the 8 external Alarms connected direct to the SUE : SISA ASA (ASA-K)

means Alarm Collector (Alarmsammler)

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SUE

Alarm collector: 8 external alarms

CUD Firmware (new CUD without SW)

Fig. 5

The SUE has two further slaves: the 2 FMX2 systems started with a SISA V/LMX forthe CUD Firmware.

TIP A NEW CUD WITHOUT LOADABLE SOFTWARE WILL BE SHOWN ONLY ASSISA V

After software download the multiplexer n*64 kbps to 2Mbps will occur.

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3 FMXII Functional View

The functional view shows the logical information flow through the FMXII from the 2Mbps G703 electrical ports to the data interfaces.

Fig. 6

EPPM64/2M #1 and #2: electrical 2Mbps ports A an B

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FU Description Remark

EPPM64/2 Electrical PlesiochronousMultiplex Port 64 kbit/s/2 Mbit/s

Electr. 2M Ports A and B

ICBD Internal Conference Block digital conference blocks forTimeslots 1 to 31

BPX64 Bottom Path Connection 64 kbit/s 64 kbps crossconnector

KZU analog ports of SLX and SUB

KZU

KZU Access Interface

analog Ports of UAC

SUBMUX Assignment for Connections assignment of D-Channels forISDN

ISDN ISDN Access Interface

IIF64 Internal Interface 64 kbps ECC Ports #2 and #3 of CUD,ECC#1 of SUE

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 QD2interface)

PET Plesiochronous Equipment Timing Synchronization sources 1 to 8

MEL Message Input (digital input groupwith 32 Bit)

external alarms

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A

B

210 171615 3130

210 171615 3130

ICBD#1:1 ICBD#31:1

ICBD#1:33 ICBD#31:33

1:=A

33:=B

Fig. 7

TIPThe ICBD gives the conference for the timeslots 1 to 31. If a port of a LC isconnected to a time slot on A or B is given by the number 1 for A and 33 for B.

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4 FMXII network structures

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The FMX2 system is used to build up private networks as access multiplexers insidepublic networks.

The TMX30, TMX2x30 and DIMX multiplexers and CC64K cross-connect can becombined 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 isimplemented via the operating program by menu selection.

It is possible to implement the following structures, which can be linked to each otherarbitrarily:

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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The following diagrams show examples of FMX2 applications.

Mirror multiplexer

2 Mbps

2 x 2 Mbps

CU, OF,

HDSL

data NTU

ISDN

data

voice

MUX

TMX30

TMX2x30NTU

ISDN

data

data

voice

MUX

TMX30

TMX2x30

Fig. 8 FMXII a mirror multiplexer configuration

Line - type network

MUX

DIMX

NTU

ISDN

data

voice MUX

TMX30

voicedataISDN

2 Mbps

CU, OF,HDSL

NTU

ISDN

data

voiceMUX

TMX30

2 Mbps

CU, OF,HDSL

N T U

Fig. 9 FMXII in a line-type network configuration

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CC64K

MUX

DIMX

MUX

DIMX

CC64K

MUX

TMX30TMX2x30

......

20

1

CC64K

MUX

DIMX

......

202-Mbps-Lines2-Mbps-Lines

1

CC64K

synchronousmultiplexers

2 Mbps2x2 Mbps

CU, OF,HDSL

Branched network

MUX

TMX30TMX2x30 2 Mbps

2x2 Mbps

CU, OF,HDSL

Fig. 10 FMXII/CMX in a branched network configuration

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ISDN

voice

Access line multiplexer

MUX

TMX30

TMX2x30

EX

#2 Mbps

CU

Fig. 11 FMXII in a AccessLine multiplexer configuration

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5 FMXII operating modes

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5.1 Terminal Multiplexer TMX30

TMX30 is a multiplexer operating mode in which a maximum of 30 time slots insidethe 2 Mbps signal are seized by the LC F2 signals in the transmit direction. If nosignaling flags are transmitted (CAS deactivated), a maximum of 31 channels areavailable 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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Functional diagram

LC

LC

.

.

.F2 F1CUD

F1out

F1in

Fig. 12 Terminal Multiplexer TMX30

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5.2 Terminal Multiplexer TMX2x30

In the multiplexer operating mode TMX2x30 it is possible to distribute a maximum of60 signals in the transmit and receive direction from the LCs to ports F1A and F1Band to transmit and send these signals as 2 Mbps signals using 30 channels each onF1A and F1B. If no signaling flags are transmitted (CAS deactivated), a totalmaximum of 62 channels are available.

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Functional diagram

LC

LC

.

.

.

F1in

F2

F1A

CUD

F1out

F1in F1BF1out

Fig. 13 Terminal Multiplexer TMX2x30

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5.3 Terminal Multiplexer TMX30(1+1)

The multiplexer operating mode TMX30(1+1) is used for protection switching of2 Mbps transmission routes. Signals from a maximum of 30 (31) channels aretransmitted simultaneously (in parallel) via both ports of the CUD.

After detection of a fault in the standard route, a changeover to the secondary routeoccurs 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 activatedat the same time at a different port, the port with lower priority will be used as thetransmission path.

There are two operation principles to choose from:

non-reverted modeIf changeover from the standard route to the secondary route occurs as a result ofa fault, automatic switch back will not occur after clearing the fault.

reverted modeIf changeover from the standard route to the secondary route occurs as a result ofa fault, switchback to the standard route occurs automatically after the fault iscleared.

TIPThis mode is used if two routes are available joining 2 different sites. It will not makeany 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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Functional diagram

LC

LC

.

.

.

F1 in

F2 CUD

F1 out

F1 in

F1 out

LC

LC

.

.

.

F1 out

F2CUD

F1 in

F1 out

F1 in

F1

ACT

STB

Fig. 14 Terminal Multiplexer TMX30(1+1)

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Functional diagram

LC . . .

F1F1

F1 in

F1 out

CUD

F1 out

F1 in

LC

F2 F2

Fig. 15 Drop/Insert-Multiplexer DIMX

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6 Channel conferencing modes of the CUD in

DIMX-mode

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Any channel (time slot) of the 2Mbit/s of the CUD can be operated in 9 differentmodes:

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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37

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F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

Through switching of a 2-Mbit/s signal

Dropping and inserting and iserting 64-kbit/s signal

PCM-E PCM-S

Fig. 17

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F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

Digital conferencing

Point (port F1A)-to-multipoint

PCM-E PCM-S

+

+

+

PCM-E PCM-S

+

Fig. 18

F1AinCUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

Point (port F1B)-to-multipoint

Point (time slot)-to-multipoint

PCM-E PCM-S

+

PCM-E PCM-S

+

Fig. 19

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F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

Broadcasting with F1A as a point

PCM-E PCM-S

F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

Broadcasting with F1B as a point

PCM-E PCM-S

Fig. 20

F1Ain

CUD

F1Bout

F1Aout F1Bin

Port F1BPort F1A

Broadcasting with a time slot as a point

PCM-E PCM-S

Fig. 21

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7 FMX2R3 additional features

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7.1 End to end nx64kbps channel protection

The multiplexer can carry out automatic changeovers between the normal andprotection 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 alsopossible in the auto protection state. In this case the path to which the changeoveroccurs must be fault-free. The protection state is not affected by a manualchangeover.

The protection states normal path forced active and protection path forced activeare also possible.

The line card is assigned double the transmission capacity, a normal path and aprotection path, both with the same authorizations, in the transmission network. In thedirection from the transmission network to the subscriber interface, the subscriberport determines the availability of the current transmission link or both transmissionlinks, and specifies the transmission link to be used.

Non-revertive protection mode is used, meaning that when the normal path isdisturbed the system changes over to the protection path if this path is fault-free. Areverse changeover occurs if there is a fault on the protection path, and the normalpath 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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Fig. 22 End to end nx 64kbps channel protection

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UAC68

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KZU2#1

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2Mbit/s frame

64kbit/s channel

ADPCM1 ADPCM2

Cross-connections

Fig. 23 Occupation of ADPCM channels

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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?

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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

TMX30TMX2x30

TMX30(1+1)

Drop/Insert-MultiplexerDIMX

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

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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

Documents

03_FA31323EN32GA0_fmx2.pdf