04_FA31324EN32GLA0_CrossConnect Multiplexer.pdf

8/10/2019 04_FA31324EN32GLA0_CrossConnect Multiplexer.pdf

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CrossConnect Multiplexer

FA31324EN32GLA0 2009 Nokia Siemens Networks

1

Contents

1 CMXC application 3

2 SNUS DCN View 8

3 System structure 10

4 Interfaces 13

4.1 External interfaces 14

4.2 Internal interfaces 16

5 Channel conferencing modes of the cross-connectors 18

6 Additional features 21

6.1 8 kbit/s cross-connections 22

6.2

Module redundancy 23

6.3 Alternative route switching for a 2 Mbit/s connection 24

6.4 Power supply redundancy 24

7 CMXC Functional View 27

8 CMXII 29

8.1 Applications in Public Networks 30

8.2 Cross-connect Multiplexer CMXII 32

8.3 Cross-connect Multiplexer CMXII-CAS 32

8.4 Cross-connect Multiplexer CMXII-V5 34

9

Exercise 37

10 Solution 39



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2009 Nokia Siemens Networks2


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3

1 CMXC application


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The CMXC cross-connect is a compact solution to establish small network nodes at8kbit/s, 64kbit/s and 2Mbit/s level. It supports up to 48x2-Mbit/s ports and makes itpossible to switch 64kbit/s channels between these ports without blocking.

The CMXC connects communication paths between the following signals:

Max. 240 each with 8 kbit/s in the structure nx8 kbit/s (n = 1, 2 and 4)

Max. 1488 each with 64 kbit/s in the structure nx64 kbit/s (n = 1 to 31) 64-kbit/schannels can be cross-connected with and without signaling identification (CAS).

Max. 48 each with 2 Mbit/s. The 2Mbit/s signals are available at 32 E1 ports and 4PCI interfaces (each with 4x 2Mbit/s signals). Unframed 2Mbit/s signals areswitched through transparently. A frame selected from framed 2Mbit/s signals canalso be used as a reference frame for signal processing in the CMXC.

The connections are usually bidirectional, but 2-Mbit/s and 64-kbit/s connections canalso be created unidirectional or as a loop (loopback).


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Fig. 1 CMXC application


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The cross-connect multiplexer offers the following possibilities:

Switching a maximum of 48 framed (with and without CRC4) and unframed2Mbit/s signals with up to 1488 switchable 64-kbit/s time slots

Group switching of nx64kbit/s time slots by complying with the frame integrity

Bidirectional switching of up to 30 time slots (64 kbit/s) via a subrate matrix toswitch nx8kbit/s channels (n = 1, 2 and 4) by changing the signal delays withoutprocessing the identification

Establishing scheduled jobs and path protection on 2Mbit/s level

Switching for Sa bits 4 to 8 to be used as the clock control bit in ring structures

Providing 4 ECC channels (two synchronous with 64 kbit/s and two asynchronous

with 9.6 kbit/s) for remote control in TMN systems

Creating conference calls for speech signals (30 subscribers in 10 conferences)with digital conference of the identification

Digital conferences for 64-kbit/s time slots with data signals (max. 10 conferenceswith up to 30 subscribers) with digital conference of the identification

Synchronization to one of 7 freely configurable clock sources (2-Mbit/s data lineclocks) or central clock pulse T3

Supervision of the connection quality according to G.821/G.826

Providing the alarm signaling contacts ZA(A), ZA(B)

Software upgrade via the QD2 interface

Restore and backup configuration data

Complying with the requirements ITU-T G.812 and G.796


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For an FMX2R3 application it is advantageous if system module FMX2R3 is operated

together with the CMXC in a ring structure. This includes:

Optimum capacity utilization of the 2-Mbit/s lines in an FMX2R3 ring 2-Mbit/s path protection is retained in a ring structure

Both 2-Mbit/s ports of the CUD unit are available in a ring structure for thetransmission of basic channels

Possibility of optionally cross-connecting 8-kbit/s and 64-kbit/s channels

Suitable structures for network management

Concentration in the CMXC such as four ECC interfaces to integrate the SNUSshelf and other system components in TMN

Fig. 2 CMXC operation with FMX2R3 in a ring structure


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2 SNUS DCN View

CMXC

Fig. 3


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3 System structure

The following units belong to cross-connect multiplexer CMXC:

One or two central CUCs (central unit cross-connect)

The central unit contains the switching matrix via which the communication pathsare connected. A second central unit is connected in parallel for moduleredundancy.

Up to two interface PU16 units (port unit with 16x2Mbit/s ports)

The interface unit provides the 2-Mbit/s interfaces. One or two PU16s areequipped depending on the number of desired interfaces.


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Fig. 5 Block Diagram of CMXC


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4 Interfaces


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4.1 External interfaces

2Mbit/s Interfaces (E1)16x2Mbit/s interfaces (E1in, E1out) are established for each PU16 unit.

HDB3-coded PCM signals are received and sent at the E1 interfaces. Theycorrespond to the ITU-T recommendation G.703/6.

The line impedance 75unsymmetrical or 120symmetrical can be set individuallyfor each interface by means of jumpers.

PCI Interfaces

There are four PCI links on the central CUC for external connections to other systemmodules of Fastlink (for later applications) via lines not exceeding 15 m.

The PCI interfaces are proprietary, symmetrical interfaces with levels according to

EIA RS422 and terminating resistors 100serial in the transmit direction and 150parallel in the receive direction.

T3 Interface

For clock synchronization, a clock signal can be fed via interface T3in and sent viaT3out. The interface is on the CUC and corresponds to the ITU-T recommendation

G.703/10. The input impedance of T3in can either be connected with high-impedance(1.6 kII < 120 pF) or with low-impedance (120 symmetrical/75 unsymmetrical).

A clock signal is sent at T3out if the cross-connect is synchronized by T3in or E1in ofa 2Mbit/s port. The interface is designed with low-impedance and is disconnectedwhen switching over to the redundant CUC.

QD2 Slave Interface

The CUC has a QD2 slave interface according to EIA RS485 which forms the TMNaccess to the network element CMXC. Because the number of subscribers is not

fixed from the start due to the bus structure and the possibility of different equipping,the interface is closed with high-impedance on the unit. Depending on the QD2structure, the bus termination must be suitably fitted on the outside. Care must betaken that two bus loads are active for redundant equipping of CUC (maximumpossible number is 32).

One QD2 address applies to active and standby CUCs.


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ECC Interfaces

The ECC interfaces transmit control information from higher-level and to remotesystem components. The control information is integrated in an ECC channel

(64kbit/s time slot) within a 2Mbit/s signal. The central CUC provides four ECCinterfaces. They conform to ITU-T V.11 and can be accessed via the connectorpanel.

Two ECC interfaces are provided as synchronous interfaces (with clock lines) andtwo as asynchronous interfaces (without clock lines). The synchronous interfaces areoperated with 64 kbit/s.

Alarm Contacts

The alarm contacts are arranged on central units CUC and are used to signal alarm

modes of the CMXC system module. They are established as floating relay contacts.

Alarm contact ZA(A) optionally signals prompt alarms (A alarm) or service alarms (Salarms) and the selection is menu-controlled. Alarm contact ZA(B) signals deferredalarms (B alarm). The software of both CUCs activates these alarms.

CCUR Interface

The symmetrical interface lines CCUR (according to RS485), signal redundancyoperation.

Each CUC signals its active or standby mode via a separate line of the externalequipment so that these can switch over their PCI bus drivers.


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4.2 Internal interfaces

PCI InterfacesThe PCI interfaces transmit useful data between the CUC and units PU16. They alsodistribute the clocks of the master clock from the CUC to the peripheral equipment.

A PCI link establishes a point-to-point connection between the CUC and the twoPU16s via two symmetrical two-wire lines (separately in the upstream anddownstream direction) on the rear panel. The external PCI interfaces are establishedvia wire pairs within a cable screen and can span distances of up to 15 m. Datasignals with symmetrical levels from which the frame and clock information isretrieved are transmitted via each wire pair.

LSI Interface

The LSI interface is established on PU16 (transmitter) and CUC (receiver). It consistsof 7 symmetrical line pairs and transfers the E1in guide clock from the PU16 to theCUCs.

An 8th line pair transfers the frame pulse belonging to the E1 guide clock.

Of the two PU16s, only one clock source may be activated per LSI line and theremaining transmit drivers are connected with high-impedance. The LSI interfacesare activated via the software according to a clock priority list.

Supervision Bus SVB

Internal communication between units CUC and PU16 takes place via thesupervision bus SVB. This bus is an HDLC interface which works according to themaster-slave principle.

The master (primary station) is the active CUC and the slaves (secondary station) thePU16 units. The standby CUC does not access the bus and the line drivers areconnected inactively.

Supervision bus SVB is used for the following functions:

Loading the software and configuration data of units PU16 during initialization,

Distributing the SISA messages via the active CUC to the SISA functional units ofunits PU16,

Module-internal communication between CUC and PU16 (e.g. control commandsof the CUC to unit PU16 for clock source control).


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CCUR Interface

There are two unsymmetrical connections between the units to signal the operatingmode of both CUCs and the PCI buses and their redundancy switchover. On PU16,

only receivers are connected to the record circuits whereas they are crossedbetween the CUC receive and transmit lines. A high level on line CCUR indicates thatthe left CUC is active and is connected via the primary PCI bus. In this mode, theCCURS line is at the low level. When changing levels, a switchover to the redundantPCI bus and to the redundant central CUC takes place.

CC Interface

The CC interface (cross coupling interface with CC_I and CC_O) connects bothCUCs and synchronizes the standby CUC via the clock master. The clock contains

the frequency reference and the position of the central multiframe synchronizationpulse is impressed via a pulse duration modulation.

CCR Interface

The CCR interface connects both CUCs and synchronizes the PCI frame of thestandby CUC via the active CUC.

STSB Interface

Data is transmitted between the active CUC and the standby CUC via the STSBinterface (status standby control). In this way the two CUCs run quasi-synchronouslyand switch over procedures can be released very quickly via the static command line(CCUR). The STSB interface is a point-to-point connection between the two centralunits inserted next to one another.


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5 Channel conferencing modes of the cross-

connectors

A maximum of 30 digital and 30 analog conference channels can be switched in up to20 mutually independent conferences at the same time. The requirements for analogand digital conferences differ:

For the analog conference, each conference participant receives the total of all theother signals. Its individual transmit signal is deactivated. The identifications areswitched digitally for the participants in analog conferences.

For the digital conference, the signals of all the participants are switched with bit-by-bit OR operation. Its individual transmit signal is retained. For the participants indigital conferences, the identifications are also switched digitally as for analogconferences.

Analog conferences Digital conferences

Maximum number of conference participants 30 30

Maximum number of participants per

conference

10 30

Maximum number of parallel conferences 10 10

Fig. 6 Conference requirements


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Any channel of the 2Mbit/s operated in the CMXC can be involved in:

Unidirectional broadcast connection

Bi-directional point to multipoint connection

Full conference connection

TS

TS

TS

TS

TS

TS

TS

TS

TS

TS

TS

TS

Broadcast

Point to

Multipoint

Full

conference

This is

the point

This is

the point

Fig. 7


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6 Additional features


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6.1 8 kbit/s cross-connections

For the realization of cross connections at the 8kbit/s level, subrate channels of 1,2 or4 bits are converted into a full 64kbit/s with 8bits, cross connected and thencompressed again to their original size. The conversion in the CMXC takes place withover- and under-sampling.

A maximum of 240 8kbit/s channels can be cross connected in a CMXC.

CMXC

1 2 3 4 5 6 7 8

CC64k

Fig. 8 CMXC 8kbps cross connection


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6.2 Module redundancy

To increase the operating reliability of CMXC, the central CUC is duplicated so thatfurther functioning of the entire system is guaranteed if the unit fails. Failure of theactive CUC leads to a redundancy switchover if there is another CUC in the CMXCsystem module. The software releases redundancy switchover. To this end, theoperability of all the components is supervised on both CUCs (active and standby).

Units PU16 are not equipped redundantly, i.e. there is no protection switching if aPU16 unit fails. Therefore, the CMXC system module has a fault penetration range of16 xE1 interfaces.

The PCI buses are duplicated. A switchover to the redundant bus is possible in caseof faults. The central CUCs are connected to separate signal groups (PCIS at

standby unit).However, the decentralized PU16 units are connected to both the bus systems. Theyreceive information about which one of the two PCI buses is active, the CCUR andCCURS signals.

Bus STSB is used as the communication interface for redundancy operation betweenthe two CUCs. The clock sources for the synchronous clock of CMXC is switchedover to standby according to a priority list.

Both CUCs manage the T3 interface and the QD2 interface. The software ensuresthat only the active CUC accesses the specific interface.

Fig. 9 CMXC module redundancy


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6.3 Alternative route switching for a 2 Mbit/sconnection

One alternative route can be configured for each 2-Mbit/s connection which isswitched over to for the alarm criteria below:

LOS, AIS, Local loop, remote loop always

SYN, BER-3 only for framed signals

SYNK, AISK only for framed signals with CAS signaling

BER-5/-6 only for framed signals, if the alarm criterion was

switched on

D-Bit, Dk-Bit, N-Bit, Nk-Bit never

The alternative route must be entered into the user menu.

The alarm criterion BER-5/-6 has a lower priority than the LOS, AIS, SYN, BER-3,AISK, SYNK, local loop and remote loop alarms. If a high priority alarm occurs at theone port and a low priory alarm at the other port, the low priority alarm will be used asthe transmission route. Therefore, the alarm criterion should be switched on.

6.4 Power supply redundancy

Units CUC and PU16 are supplied with an input voltage of -48 V (-36 V to -72 V). Theinput voltage is fed via a plug in the connector panel of the shelf. For redundancyoperation, a second plug (S) is provided to feed a further -48 V. The active andstandby CUCs are connected to either of the two voltages in each case. The PU16units are connected to both voltages. The input voltages are fed to the consumers via

EMC filters on the backplane of the shelf.


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Fig. 10 Power supply redundancy


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7 CMXC Functional View

Fig. 11


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Function Group Function Remark

EPP2 Electrical Plesiochronous Port 2 Mbps PU 16

BPX2 Bottom Path Connection 2 Mbps 2Mbps crossconnector

IPMB64/2 Internal Plesiochronous MultiplexBlock 64 bps/2 Mbps

for each EPP2 max. 1IPMB64/2

BPX64 Bottom Path Connection 64 kbps

ICBA Internal Conference Block Analog

ICBD Internal Conference Block Digital

IIF64 Internal Interface 64 kbps 4x ECC IF on CUC

IPMB8k/64 Internal Plesiochronous Multiplex

Block 8 kbps/64 kbps

limited to 30 TSs

SPBX Bottom Path Connection 8 kbps Crossconnector bit level

SISA0 SISA-0 (Management of the QD2interface

PET Plesiochronous Equipment Timing up to 8 clock sources

MEL Message Input (digital input groupwith 32 Bit)

external alarms on SNU


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8 CMXII


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8.1 Applications in Public Networks

Both traditional and alternative carriers aim to build networks to meet the specificrequirements of business customers. The solution comprises setting up the businesscustomer's dedicated network with FMX2 and linking this via a freely-selectableaccess point to the CMXII/CMXC system in the public network.

As shown in Figure 2 below, FMX2 nodes can be connected to CMXII & CMXCnodes. The channel-associated signaling of the FMX2 network is processed in theCMXII in accordance with V5.1 or for concentrated traffic, in accordance with V5.2.The CMXII can also switch channel-associated signals between its ingresses andegress ports (which is also possible using the CMXC node). For V5.x operations, theCMXII converts channel-associated signaling into V5 protocols. The conversionprocess involves assigning the incoming channels from the subscribers either to upto 92 x 2-Mbit/s interfaces in accordance with V5.1 or to up to 32 x 2-Mbit/s interfacesaccording to V5.2 in any arrangement.


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Fig. 12


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8.2 Cross-connect Multiplexer CMXII

This can be used as a larger network node and processes either channel-associatedsignaling or V5 protocol. In the latter case, the channel-associated signaling of themultiplexer is converted in the CMXII into V5 protocols

8.3 Cross-connect Mult iplexer CMXII-CAS

For routing the services via a larger network node, cross-connect multiplexerCMXIICAS is used. The non-blocking switching is undertaken at the 64kbit/s level.The CMXIICAS consists of the following units:

Central unit CCU

CAS unit CASU

Port Unit PU2+

Optional unit PUSISA

Management Control unit MCU

Power supply PSC

The PUSISA is used if remote equipment (up to 128) is to be controlled via 64kbit/schannels (ECC). The CCU, CASU and PSC can be duplicated if module redundancyis required.

The cross-connect multiplexer is available in four different capacity stages in one ofthe following combinations:

Single shelf (CMXII-LS)

Combination of 2 shelves

CMXII-CS and CMXII-2S

CMXII-LS and CMXII-2S

Combination of 3 shelves

CMXII-CS and 2 x CMXII-2S

This means that its overall capacity can be adapted very variably to the requirementsof the network. Power supply to the CMXII-CAS is -48 V/-60 V.


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33

Fig. 13

Port Unit PU2+ possesses 4 x 2Mbit/s interfaces. If the shelves are fully equipped,the switching capacities are as shown in the table below:

8.3.1 Operating Modes

Connection types- 64kbit/s

- 2Mbit/s as per ITU-T G.703, transparent

- 2Mbit/s structured as per ITU-T G.704

- Leased lines n x 64kbit/s

Connections either bidirectional, unidirectional, or also broadcast

Cross connection of channel-associated signaling (CAS)

Path protection at 2Mbit/s level


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8.3.2 5.8.2 Interfaces

Clock interfaces T3in and T3out for external synchronization QD2 interface for connection to a management system

F interface for local management access (with LCT)

Alarm interface as floating relay contacts

2Mbit/s as per ITU-T G.703

8.4 Cross-connect Multiplexer CMXII-V5

As a gateway for POTS and ISDN services between the dedicated network and thepublic network, the cross-connect multiplexer CMXII-V5 converts channel-associatedsignaling (CAS) either into V5.1 or into V5.2 switching protocols. Throughconnections of leased lines or of CAS are also possible.

The CMXII-V5 consists of the following units:

Central unit CCU

Frame Relay unit V52FR

Port Unit PUCAS and/or PU2+

Optional unit PUSISA

Management Control unit MCU

Power supply PSC

The CCU, V52FR and PSC can be duplicated if module redundancy is required. TheCAS-V5 conversion is implemented with the PUCAS for the following subscribertypes of the FMX:

POTS (SUB102)

ISDN-BA (I8S0P/IUL82/IUL84)

In parallel, with the PU2+ on the subscriber side, 2Mbit/s signals with V5.1 protocolcan be switched or also concentrated in accordance with V5.2. In addition and usinginternal signaling protocol V5C, a concentration of the subscribers can beundertaken. Simultaneous operation of V5.1 and V5.2 in the direction of theexchange is not possible. The same shelf capacity stages are available as for theCMXII-CAS, but with concentration with V5.2 on the exchange side higher numbers

of subscribers are possible. The power supply of the CMXII-V5 is -48 V/-60 V.


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Fig. 14

8.4.1 Interfaces

2Mbit/s acc. to ITU-T G.703

T3in, QD2, F interface and alarm contacts see CMXII-CAS

PUCAS and PU2+ each possess 4 x 2Mbit/s interfaces. If the shelves are fullyequipped on the subscriber side with PUCAS and on the network side with PU2+, theresulting switching capacities are per the table below:


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9 Exercise

1. What modules belong to CMXC Network Element?

2. Which shelves can equip the CMXC Network Element?

3. How many 2Mbps interfaces can be provided by 2xPU16 cards?

4. What are the different conference modes in CMXC?

5. What redundancy features are provided by CMXC?

6. In SNU Shelf, which ports of PU16 are shared with PDH or SDH transports?


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10 Solution

1. What modules belong to CMXC Network Element?

Cross Connection Unit (CUC)

Port Unit (PU16)

2. Which shelves can equip the CMXC Network Element?

SNU Shelf

3. How many 2Mbps interfaces can be provided by 2xPU16 cards?

32 x 2Mbps Interfaces (16 ports each PU16)

4. What are the different conference modes in CMXC?

Full Conference

Bidirectional Point to Multipoint

Unidirectional Broadcast

5. What redundancy features are provided by CMXC?

CUC Module Redundancy

Power Supply Redundancy

2Mbps Route Redundancy

6. In SNU Shelf, which ports of PU16 are shared with PDH or SDH transports?

PU16 port number 9 to 16


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04_FA31324EN32GLA0_CrossConnect Multiplexer.pdf

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