04_2512e6_sn

Switching Network (SN(B)) Siemens

MN2512E6A021

ObjectivesObjectivesObjectivesObjectives

The participant is able to� name the units of the SN(B) and their functions� localize the modules of the SN(B)� maintain the SN� operate the SN

ContentsContentsContentsContents

1 Functional Description 31.1 Introduction 41.2 Hardware 61.3 SN(B) Rack and Module Frames 162 MML Commands 192.1 Interrogating the SN 202.2 Configuring SN Components 222.3 Diagnose SN Components 263 Exercises 294 Solutions 35

-Register-Dat ei

Switching Network (SN(B))Switching Network (SN(B))Switching Network (SN(B))Switching Network (SN(B))

Siemens Switching Network (SN(B))

MN2512E6A022


MN2512E6A023

1111 Functional DescriptionFunctional DescriptionFunctional DescriptionFunctional Description


MN2512E6A024

1.11.11.11.1 IntroductionIntroductionIntroductionIntroductionThe switching network SN is the link inside a node for:

� traffic connections between LTGs (temporary through connections)

� the EWSD internal message exchange between LTG, CCNC and CP control unitsvia fixed message channels MCH

� CCS7 signaling messages between CCS7 signaling channels in PCM linksconnected to the LTG and the CCNC (fixed connections set by command).

The switching network is fully duplicated (SN0 and SN1). For traffic connections, oneis the active, the other one the standby side. All calls are always simultaneouslythrough connected via both SN sides while the LTG only through connects userchannel information received from the active SN to the PCM links. If the active SNfails the system switches to the standby SN without any loss.

Through connection in the SN occurs in accordance with the "time – space – time"principle (change of time slot – change of space slot – change of time slot). Eachthrough connection ensures a transparent bidirectional 64kbit/s path through the SN.

In addition to temporary through connections (transient calls), the following non-switched connections also apply:

� nailed-up connections (NUC) set by MML command

� through connection of message channels between LTG control units and themessage buffer (permanently specified by CP software).

Every connection between the SN and other functional units use secondary digitalcarrier lines (SDC) with a bit rate of 8192kbps (mostly called 8Mbit system orhighways), carrying 128 standard 64kbps time slots (numbers 0-127).


MN2512E6A025

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SN0

SN1LTG1

LTGn

CCNC

Coordination Area

Traffic, CCS7 signaling, internal messages

CCS7 signaling, internal messages

Internal messages

Fig. 1 Position of the switching network in the D900 system


MN2512E6A026

1.21.21.21.2 HardwareHardwareHardwareHardwareThe SN for EWSD systems is available in different capacity stages. With theexception of the small switching network for a maximum of 63 LTGs (combinedspace-time stages), each SN consists of the subunits time stage group (TSG) andspace stage group (SSG).

Time Stage Group (TSG):

Each TSG connects the SDC to/from the LTG, CCNC, and MB. 64 of this SDCs canbe connected to each TSG. An SN is made of a maximum of 8 duplicated TSG. EachTSG contains a switch group control (SGC) which is connected to the CP via themessage buffer (MB) with an own SDC line. The SGC receives setting instructionsfor temporary or fixed bidirectional 64kbps through connections from the CP. TheSGC implements through connections by setting the individual time stage modules(TSM) in a TSG. Inside a TSG each TSM can change the position in time and space ofany time slot arbitrarily for a group of 8 connected SDC.

Space Stage Group (SSG):

The SSG through connects a call between TSM inside the same or different TSG. AnSN consists of a maximum of 4 duplicated SSG. Inside the SSG is a switch groupcontrol (SGC) connected to the CP via the message buffer (MB). The SGC receivessetting instructions for temporary or fixed bidirectional 64kbps through connectionsfrom the CP. The SGC implements through connections by setting the individualspace stage modules (SSM) in an SSG. Each SSM can change the space slot of thetime slot for connected SDC arbitrarily.

External and internal connections

The following types of secondary digital carriers (SDC) with 8Mbps form the internaland external interfaces of the SN:

� SDC:LTG between TSG and maximum 63 LTG for circuit connections (time slots1-127) and for message exchange between the LTG GP control unit and the CP(message channel to time slot 0). Any TSG port can be used except 0, which isreserved for the SDC:TSG to the message buffer.

� one or two SDC:CCNC to through connect CCS7 messages between the CCNCand the signaling channels in the PCM links. Can use any TSG port except 0 (MB).

� one SDC:TSG between TSG and MB to transfer the message channel for all LTGin this TSG to the CP. Always connected to port 0 of every TSG.

� one SDC:SGC between the SGC control unit in a TSG/SSG and the MB to transferthe CP setting instructions to TSG/SSG

� The individual TSG and SSG are connected to each other via SDC:SSG


MN2512E6A027

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SN 0 or SN 1

TimeStageGroup

SpaceStageGroup

SGC

SGC

InternalInterfaces

SDC:SSG

SDC:SGC

SDC:SGC

SDC:SSG

SDC:SSG

64 SDC:LTG ports per TSG

SDC:LTG

SDC:LTG

SDC:TSG 0

MB

MBU

MBU

LTG1

LTGn

CCNCSDC:CCNC

Port 0 on every TSG

CP

Fig. 2 Interfaces and internal structure of the SN


MN2512E6A028

Capacity stages

As the SN is available in different increments the actual size of the switchingnetwork can be matched to the expected traffic volume in an exchange. The volumeof traffic to be through connected measured in Erlangs is used as the dimensionalsize.

TIPIn addition to the increments listed the special implementation of SN for 31 LTG andfor 63 LTG is also available for small EWSD.

Capacity / space requirements for SN increments:

� If a CCNC is connected, 1 or 2 SDC:CCNC are added depending on the number ofCCS7 signaling channels; the number of SDC:LTG is reduced accordingly.

� Space requirements inside a rack:

Each TSG requires only one frame inside a rack. Each SSG requires only a half of aframe inside a rack. The remaining space inside the rack can be used for LTG.

In a TSG rack it is possible to install a maximum of 4 LTG module frames.

In an SSG rack it is possible to install a maximum of 4 LTG module frames.

In the SN:63LTG rack it is possible to install a maximum of 4 LTG module frames.

The SN:31LTG is stored inside the CP rack.

TIPMobile systems are not fully equipped with all possible LTGs. Because of the muchhigher signaling load in a PLMN, the amount of internal messages would be too highfor the message buffer. Fig. 3 shows the capacity stages of EWSD and D900systems.


MN2512E6A029

TSG1.0

TSG0.0

TSG1.1

TSG0.1

TSG1.2

TSG0.2

TSG1.3

TSG0.3

TSG1.4

TSG0.4

TSG1.5

TSG0.5

TSG1.6

TSG0.6

TSG1.7

TSG0.7

SSG1.0&1.1

SSG0.0&0.1

SSG1.2&1.3

SSG0.2&0.3

TSG1.0

TSG0.0

TSG1.1

TSG0.1

TSG1.2

TSG0.2

TSG1.3

TSG0.3

SSG1.0&1.1

SSG0.0&0.1

TSG1.0

TSG0.0

TSG1.1

TSG0.1

SSG1.0

SSG0.0

SN:126LTG

SN:252LTG

SN:504LTG

SN0

SN1

SN0

SN1

SN0

SN1

Capacity stages of the switching networks

EWSD exchanges SN126 SN252 SN504

Maximum number of SDC:LTGs 126 252 504

Maximum number of SDC:CCNC 2 2 2

Number of SDC:TSG for message exchange 2 4 8

Number of SDC:SGC for call setup 3 6 12

D900 exchanges SN126 SN252 SN504

Maximum number of SDC:LTGs 62 124 248

Maximum number of SDC:CCNC 2 2 2

Number of SDC:TSG for message exchange 2 4 8

Number of SDC:SGC for call setup 3 6 12

Fig. 3 Capacity stages of the switching network


MN2512E6A0210

1.2.11.2.11.2.11.2.1 SN(B) Functional Units and ModulesSN(B) Functional Units and ModulesSN(B) Functional Units and ModulesSN(B) Functional Units and Modules

The SN(B) is divided into the following functional units:

� Time switch circuit (TSC)A TSC can connect each incoming time slot belonging to one of the 4 connectedSDC:LTG to a random outgoing time slot on any of the 4 connected SN internalSDCs. As each of the SDCs is always bidirectional a TSC is divided into TSCincoming and TSC outgoing.

� Link interface to LTG (LIL)The LIL is the interface to the LTG. It is responsible for propagation timeequalization of the SDC:LTG.

� Space switch SS16|16An SS16|16 can connect any incoming time slot belonging to one of the 16connected SDC to the outgoing time slot with the same number belonging to anyof these 16 SDC.

� Space Switch SS8|15An SS8|15 is connected to 8 SDC on one side and 15 SDC on the other side.Each SS8|15 is divided into two subunits. One unit can connect any incoming timeslot belonging to one of the 8 SDC on one side to the outgoing time slot with thesame number belonging to one of the 15 SDC on the other side. The othersubunit can connect any incoming time slot belonging to one of the 15 SDC onone side to the outgoing time slot with the same number belonging to one of the8 SDC on the other side.

� Link interface between TSG and SSG (LIS)The SDC:SSG (TSG – SSG) are connected to SSG and TSG via the LIS. These actas interfaces for propagation time equalization of the individual SDC. In additionthe LIS specifies which TSG (SN0 or 1) will interoperate with which SSG (SN0 or1). In this sense it can be compared to the LIU function inside the LTG.

� Switch group control (SGC)Each SGC controls the functional units in its TSG/SSG. To do this it interacts withthe CP via its SDC:SGC.

� Link Interface to message buffer (LIM)The interface function for the SDC:SGC to the message buffer is implemented bymeans of the LIM component.

In the SN(B) the individual functional units are assigned to modules as follows:

� 2 TSC including LIL function are implemented in one TSMB module

� in the TSG the LIS function for 16 SDC is implemented in one LISB module

� the LIS function of the SSG is implemented with 2 SS8|15 in one SSM8B module

� 8 SS16|16 are implemented in one SSM16B module

� LIM and SGC functions are implemented in one SGCB


MN2512E6A0211

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2 xTSC

2 xLIL LIS

LIM

SGC

TSMB LISB

SGCB

TSG

2 xSS8|15

2 xLIS

8 xSS

16|16

LIM

SGC

SSM8B SSM16B

SGCB

SSG

SDC:LTG

Fig. 4 Internal structure of TSG and SSG


MN2512E6A0212

1.2.21.2.21.2.21.2.2 Interconnection between Functional UnitsInterconnection between Functional UnitsInterconnection between Functional UnitsInterconnection between Functional Units

Rules for internal connections inside the TSG:

� the TSC number is the same as the number of the corresponding LISB port

� the number of the TSC port is the same as the number of the corresponding LISB

Rules for internal connections inside the SSG:

� the SS8|15 number is the same as the number of the corresponding SS16|16 port

� the number of the SS8|15 port is the same as the number of the correspondingSS16|16

TSMB-7

TSMB-0

TSC0 LISB0

0

1

15

0

1

2

3

TSC1

0

1

2

3 LISB1

0

1

15

LISB2

0

1

15

LISB3

0

1

15TSC15

0

1

2

3

TSC14

0

1

2

3

0

1

2

3

4

5

6

7

56

57

58

59

60

61

62

63

SDC:LTG

TSGx-x

0

1

2

3

0

1

2

3

0

1

2

3

0

1

2

3

LIL0

LIL1

LIL15

LIL14

0

1

2

3

0

1

2

3

0

1

2

3

0

1

2

3

14

14

14

14

Fig. 5 Internal connections of a TSG


MN2512E6A0213

SSM16B-0

SSM8B-7

SSM8B-0

SS8|150

SS8|151

SS8|1514

01

14

SS8|1515

01

14

01

14

01

14

01

7

0

0

01

1

1

7

7

7

LIS0

LIS1

LIS14

LIS15

01

15

SS16|161

01

15

SS16|166

01

15

SS16|167

01

15

SSM16B-1

SS16|168

01

15

SS16|169

01

15

SS16|1614

01

15

SS16|1615

01

15

SSM8B-1

SS8|152

01

14

SS8|153

01

14

0

0

1

1

7

7

LIS14

LIS15

Not used

SSGx-x

14

14

SS16|160

14

14

14

14

14

14

Fig. 6 Internal connections of a SSG


MN2512E6A0214

Interconnection of TSG and SSG

Fig. 7 shows an example of cable connections between TSG and SSG. An SN126LTG was selected for this example. The duplication is not shown.

TIPEach line represents two cables. Each cable contains the wires of 16SDC:SSG forone transmission direction.

Protection Switching Options:

Fig. 8 shows the position of the switches in the LIS functional units (in the TSG LISBand SSG SSM8B) for the following SN configurations:

� TSG and SSG in SN0 are active

� TSG and SSG in SN1 are in stand by status

If an active unit fails the configuration status is changed so that all LTG remainavailable.

Examples of protection switching:

� TSG 0-0 fails:TSG and SSG in SN1 are activated automatically, SSG0-0 changes to standby

� SSG 1-0 also fails:TSG 1-0 and SSG0-0 become active and interoperate (crossover switching)


MN2512E6A0215

SN(B) 0 or 1

TSGn-0

SSGn-0

TSGn-1

LISB0

LISB1

LISB2

LISB3

LISB0

LISB1

LISB2

LISB3

SSM8B0

SSM8B1

SSM8B2

SSM8B3

SSM8B4

SSM8B5

SSM8B6

SSM8B7

Fig. 7 Example of interconnection between TSGs and SSGs

LTG(LIU)

LIL

TSCO

TSCI

LISB

TSMB

TSG0-0

LIL

TSCO

TSCI

LISB

TSMB

TSG1-0

LIS

SS15|8

SS8|15

SSM16B

SSM8B

SSG0-0

LIS

SS15|8

SS8|15

SSM16B

SSM8B

SSG1-0

SN(B) 0(active)

SN(B) 1(standby)

Fig. 8 Protection switching options


MN2512E6A0216

1.31.31.31.3 SN(B) Rack and Module FramesSN(B) Rack and Module FramesSN(B) Rack and Module FramesSN(B) Rack and Module FramesEach SN rack always contains 2 SN module frames. These can be installed inside therack at the top or bottom. The remaining space inside the rack can be used for LTGand/or MB.

A rack always contains one of the following module frame types for redundant unitsfrom SN0 and SN1:

� TSG(B) frame with one TSG

� SSG(B) frame with one or two SSG belonging to the same SN plane

� TSG(B) frame with one SN:63LTG plane

101 113 125 137 149 161 173 185 197 209 221 233 245 257 269 281 293 305 317 329 341MOLOC

TSM

B0

Module frame F:TSG(B)

TSM

B1

TSM

B2

TSM

B3

LISB

0

LISB

1

SGC

B

LISB

2

LISB

3

TSM

B4

DC

C

TSM

B5

TSM

B6

TSM

B7

101 113 125 137 149 161 173 185 197 209 221 233 245 257 269 281 293 305 317 329 341MOLOC

SSM

8B0

Module frame F:SSG(B)

SSM

8B1

SSM

16B

0SS

M8B

2

SSM

8B7

DC

C

DC

C

SSM

8B3

SGC

BSS

M8B

4

SSM

8B5

SSM

16B

1SS

M8B

6

SSM

8B0

SSM

8B1

SSM

16B

0SS

M8B

2

SSM

8B7

SSM

8B3

SGC

BSS

M8B

4

SSM

8B5

SSM

16B

1SS

M8B

6

SSG(B)x-x SSG(B)x-x

Fig. 9 Frames for the SN(B)


MN2512E6A0217

Fuses MUT01

F:SSG(B)

MUT02

MUT03

MUT04

MUT05

MUT07

R:SSG(B)LTGM

F:SSG(B)

F:LTGM

F:LTGM

F:LTGM

F:LTGM

MUT06

Fuses MUT01

F:TSG(B)

MUT02

MUT03

MUT04

MUT05

MUT07

R:TSG(B)LTGM

F:TSG(B)

F:LTGM

F:LTGM

F:LTGM

F:LTGM

MUT06SN0

SN1SN1

SN0

Fig. 10 Examples of rack layouts for the SN


MN2512E6A0218


MN2512E6A0219

2222 MML CommandsMML CommandsMML CommandsMML Commands


MN2512E6A0220

2.12.12.12.1 Interrogating the SNInterrogating the SNInterrogating the SNInterrogating the SN

Interrogating the SN

STAT SN ;

DISP TSG : SN= ;

The DISPTSG command displays the expansion data for one or both switchingnetwork sides. It shows the number of time stage modules:

Amount of TSMs = (TSMMAX + 1) / 2


MN2512E6A0221

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MSC2/D2MMPK1V9502-I21/000 98-12-18 16:08:141971 CA MARTIN#1 3080/00226

STATSN; EXEC'D

TSG SSG TSG SSG------- ------- ------- -------0-0 ACT 0-0 ACT 1-0 STB 1-0 STB0-1 PLA 1-1 PLA

END JOB 1971


DISPTSG:SN=X;

TSG TSMMAX----+------0-0 50-1 51-0 51-1 5

END JOB 1977

Fig. 11 Interrogation of the SN


MN2512E6A0222

2.22.22.22.2 Configuring SN ComponentsConfiguring SN ComponentsConfiguring SN ComponentsConfiguring SN Components

Configuring SN components

CONF SN : SN= ,OST= [ ,UNCOND= ] [ ,SUP= ] ;

CONF SSG : SN= ,SSG= ,OST= [ ,UNCOND= ] [ ,SUP= ] ;

CONF TSG : SN= ,TSG= ,OST= [ ,UNCOND= ] [ ,SUP= ] ;

TIPIt is not possible to configure a SN half to active. to change the operating status ofthe SN halves, configure the active SN to STB.


MN2512E6A0223

ACT

MBL

NAC

UNA

STB


CONFSN:SN=0,OST=STB;

STARTING CONFIGURATION FOR SN -0 FROM ACT TO STB

END TEXT 2179


CONFSN:SN=0,OST=STB;

END OF CONFIGURATION FOR SN -0 FROM ACT TO STB

END TEXT 2179


CONFSN:SN=0,OST=STB; EXEC'D

END JOB 2179

Fig. 12 Configuring the SN


MN2512E6A0224

ACT

MBL

NAC

UNA

STB


CONFTSG:SN=0,TSG=0,OST=MBL;

STARTING CONFIGURATION FOR TSG -0-0 FROM STB TO MBL

END TEXT 2191


CONFTSG:SN=0,TSG=0,OST=MBL;

END OF CONFIGURATION FOR TSG -0-0 FROM STB TO MBL

END TEXT 2191


CONFTSG:SN=0,TSG=0,OST=MBL; EXEC'D

END JOB 2191

Fig. 13 Configuring the TSG or SSG


MN2512E6A0225

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


MN2512E6A0226

2.32.32.32.3 Diagnose SN ComponentsDiagnose SN ComponentsDiagnose SN ComponentsDiagnose SN Components

Diagnose SN components

DIAG SN : SN= ,TA= ;

DIAG SSG : SN= ,SSG= ,TA= ;

DIAG TSG : SN= ,TSG= ,TA= ;


MN2512E6A0227

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DIAGSN:SN=0,TA=ALL; STARTED

END TEXT 2437


DIAGSN:SN=0,TA=ALL; EXEC'D

RESULT = NO FAULT DETECTED

END JOB 2437


DIAGSSG:SN=0,SSG=0,TA=SSM,SUBUNT=SSM-0; STARTED

END TEXT 2479


DIAGSSG:SN=0,SSG=0,TA=SSM,SUBUNT=SSM-0; EXEC'D

RESULT = NO FAULT DETECTED

END JOB 2479

Fig. 14 Diagnose the SN


MN2512E6A0228


MN2512E6A0229

3333 ExercisesExercisesExercisesExercises


MN2512E6A0230


MN2512E6A0231

Exercise 1Exercise 1Exercise 1Exercise 1

Title:Title:Title:Title: Questions about the Switching Network)

Objectives:Objectives:Objectives:Objectives: Repetition of the topics in this chapter

Pre-requisite:Pre-requisite:Pre-requisite:Pre-requisite: The student can explain the Switching Network

TaskTaskTaskTask

Please answer the following questions

QueryQueryQueryQuery

� What are the tasks of the switching network ?

� 102 LTGs and one CCNC are to be connected to the switching network. Howmany TSMB modules are required ?

� Which is the bit rate of the SN internal highways ?

� Which capacity stages of a SN do you know ?

� What is the time slot 0 between SN and LTG used for ?

� Which unit performs the through-connection of a path in SN ?

� What type of connection does the SN realize ?

� What is the effect of a fault in the SN ?


MN2512E6A0232


MN2512E6A0233

Exercise 2Exercise 2Exercise 2Exercise 2

Title:Title:Title:Title: Standard HW Fault Clearance SN: Hands On Training

Objectives:Objectives:Objectives:Objectives: The participant is able to

� perform the SN fault clearance tasks of a network elementmanager

Pre-requisite:Pre-requisite:Pre-requisite:Pre-requisite: � Training exchange or Computer Based Simulator is available

� MMN, CML and ECD

TaskTaskTaskTask

Perform fault clearance for a given example!


List the MMN procedure(s) which have to be performed!


MN2512E6A0234


MN2512E6A0235

4444 SolutionsSolutionsSolutionsSolutions


MN2512E6A0236


MN2512E6A0237

Solution 1Solution 1Solution 1Solution 1

Title:Title:Title:Title: Questions about the Switching Network)

Objectives:Objectives:Objectives:Objectives: Repetition of the topics in this chapter

Pre-requisite:Pre-requisite:Pre-requisite:Pre-requisite: The student can explain the Switching Network

TaskTaskTaskTask

Please answer the following questions


� What are the tasks of the switching network ?

Through-connection of the speech channels. Emergency switchover.

� 102 LTGs and one CCNC are to be connected to the switching network. Howmany TSMB modules are required ?

102 (LTG) + 1(CCNC) + 2(MBU) = 105 ; 105/8 => 14 TSMB

� Which is the bit rate of the SN internal highways ?

8Mbps

� Which capacity stages of a SN do you know ?

SN:63LTG, SN:126LTG, SN:256LTG, SN:504LTG

� What is the time slot 0 between SN and LTG used for ?

Exclusively for internal signaling purposes (message channel)

� Which unit performs the through-connection of a path in SN ?

SGCB upon commands it receives from the CP

� What type of connection does the SN realize ?

Single channel, broadcast, nailed-up-connections

� What is the effect of a fault in the SN ?

SN performs the switchover to standby plane


MN2512E6A0238

Documents

04_2512e6_sn