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Line Trunk Group (LTG) Siemens

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Contents1 Functional Description 31.1 Introduction 41.2 Hardware 101.3 Rack and Frame Layouts 222 MML Commands 272.1 Interrogating the LTG 282.2 Configuring the LTG 322.3 Diagnosing the LTG 382.4 Creation of LTG Hardware 403 Exercise 474 Solution 53

Line Trunk Group (LTG)

Siemens Line Trunk Group (LTG)

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1 Functional Description


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1.1 IntroductionThe line/trunk group (LTG) forms the interface between the digital environment of thenode and the digital switching network (SN).The LTG perform non-central control functions and thus relieve the coordinationprocessor (CP) of routine work. Several LTG types are available for optimalimplementation of the various line types and signaling methods. The LTG typesessentially have the same basic structure and operate according to the sameprinciples. They differ only in a few hardware units and the specific applicationprograms in the group processor (GP).The connection between the LTG and the duplicated switching network (SN) is madeby a secondary digital carrier (SDC). The transmission rate on the SDC from the LTGto the SN and vice-versa is 8192kbps (abbreviated to 8Mbps). Each of these 8Mbpsmultiplex systems has 127 time slots, each with 64kbps for user and CCS7information, and one 64kbps time slot (TS0) for internal messages between LTG, CPand CCNC..The LTG always transmits and receives the speech information via both sides of theswitching network (SN0 and SN1). Both SN sides thus receive the same userinformation. The LTG only assigns the speech information from the active switchingnetwork unit to the subscriber concerned. The other SN side is designated as inactiveand can transmit and receive the current user information immediately if a faultoccurs.


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• Call processing: decentralized control tasks for call setup to reduce the load of the CP

• Interface conversion between duplicated SN and the digitalenvironment of the node (through-connection of the user information)

LTG

SN0

SN1

8Mbps SDC

8Mbps SDC

PDC 3

PDC 2

PDC 1

PDC 0

Signaling to other nodes, DLU/subscribers and PBX:

−=Generation of signaling messages to be sent upon initiative of the CP

−=Pre-evaluation of received signaling messages and relay to the CP

Communication via the message channels with:

−= the CP

−= the CCNC

−=other LTG

Generation of audible signaling tones for the subscriber (tone generator) and evaluation of the DTMF dialed digits (code receiver)

Call processing tasks of the LTG

Fig. 1 Integration of LTG to the system


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1.1.1 LTG Types in EWSDIn order to optimally realize various line types and signaling systems, several LTGfunctional types each with specific application programs are available.These various functional types of the LTG SW determine the connecting capabilitiesto an LTG.Different types of LTG frames exist simultaneously.The table opposite shows which LTG software functional type is compatible withwhich hardware implementation.


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Functional LTG typesfor EWSD

Compatible LTG

HW - Type

Functional type B LTG G/M/N

Functional type C

can be applied to connect:

− Trunks with CAS signaling

− Trunks with CCS7 signaling

− CCS7 signaling channels

LTG G/M/N

Functional type D

can be applied to connect:

− International trunks with echo suppression /No5 signaling

LTG D

Functional type H

Frame handler for (de)concentration of X.25data packets from ISDN subscribers

LTG H

can be applied to connect:− DLU− PBX− Intelligent peripheral

− Packet handler of a X.25 packet network

– V5.2 Access Network (only to LTG M/N )can be equipped with OCANEQ,COU,MDTOG...

Fig. 2 LTG types in EWSD


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1.1.2 LTG Types in D900In the D900 switch all LTG applications belong to the functional type "B".Depending on the application and age of the LTG the following hardware types maybe used in the D900 system: LTGG, oldest used type, necessary for OCANEQ and IN tasks LTGM, current standard type for all other kinds of applications LTGN, new type, replaces LTGM

TIPIn older switches another LTG hardware type can be found, the LTGB. It is not usedin newer D900 systems and will not be discussed in this chapter.


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SN

LTGNLTGM or

LTGG

SN

8Mbps SDCPDC

Digital trunks to BSS with CCS7(BSSAP)

LTGNLTGM or

LTGGDigital trunks to fixed networks with CCS7(ISUP/TUP)or CAS (MFC:R2)

LTGNLTGM or

LTGGDigital trunks to other SSS nodes and, if required, servicecenters (e.g. SMS centers) with CCS7(MAP and ISUP)

LTGNLTGM or

LTGG

Trunk loop LTG (for wired ISDN BA/PA subscribers and analog subscribers with DEC120, for GSM subscribers at MIC/MMC without DEC120)

LTGM or

LTGGConference LTG(for MPTY service)

LTGNLTGM or

LTGGISDN primary rate access (PA) lines with DSS1(for subscribers of a large ISDN-PABX)

LTGNLTGM or

LTGGDLUB

ISDN basic access (BA) lines with DSS1, andanalog access lines with analog signaling(for ISDN subscribers and analog subscribersincluding small/medium-size ISDN-PABX andanalog PBX/PABX)

LTGNLTGM or

LTGG

DSU(IWE)

LTG to connect DSU(for GSM data services)

LTGNLTGM or

LTGGDASLTG to connect DAS

LTG application (functional type B)

LTGhardware type

Fig. 3 Overview of LTG types and tasks in D900


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1.2 HardwareThe various LTG types basically have the same internal structure and consist of thefollowing physical or logical units. Depending on the LTG type, these units can befound on different hardware modules:

Group ProcessorThe group processor (GP) matches the incoming information from the surroundingnetwork node area to the internal message format of the system and controls all theparts within the LTG.

Link Interface Unit (LIU)The LIU connects the LTG to the duplicated SN (SN0 and SN1). The LIU convertsthe 8Mbps multiplex highway arriving from the GS into two parallel 8Mbps SDC to theSN. Conversely, it receives the user information from the switching network via twoparallel SDC. The LIU selects the data from the switching network-half designated asactive and forwards it to the GS. The LIU synchronizes the information arriving overSDC from the SN with the LTG-internal clock system and feeds the node clock(8192kHz) to the group clock generator of the LTG. It extracts the CP commandsfrom the message channel (TS0) and forwards them to the GP. In the oppositedirection, the LIU transfers GP messages to the CP. After each connection setup, theLIU verifies correct through-connection in the SN with the aid of the cross-officecheck (COC). For this purpose, the calling LIU sends a test bit sequence that isreflected by the LIU of the called side. If the transmitted and reflected bit patterns areidentical, the established connection is switched through to the subscriber.

Group Clock Generator (GCG)The GCG supplies the LTG with the required control clocks. The crystal oscillator inthe GCG is synchronized with a signal derived from the system clock in the LIU via aphase-locked loop.

Signaling Link Control (SILC) partThe Signaling Link Control (SILC) part functions as an input/output processor. TheSILC is used to connect a number of signaling channels via which either the protocolfor DLU access (DLU protocol) or the ISDN D-channel protocol for the primaryaccess (PA protocol) can be handled. The transmission protocols are based on theHDLC procedure.On the LTG side, the SILC completes the layer-2 functions of signaling protocols(synchronization, error detection, error handling) and thereby guarantees securemessage exchange between peripheral units and the GP.


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

GP

GS LIU

SU

LTU

LTU

LTU

SILC

8Mbps SDCto SN0 and SN1

8Mbps2Mbps

GCG

TOGRM:CTC

CR

DIULDI

DECCOU

OCANEQCR

MDTOGATE

Fig. 4 Internal structure of the LTG


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Signaling Unit (SU)The SU is a logical unit of the LTG. Physically, the following subunits are possible: Code Receiver (CR)

The CR receives and detects multifrequency signals (DTMF, MFC-R2, MFC-R1). Tone Generator (TOG)

The TOG generates the audible tones required for all line/trunk units (LTU) andthe frequencies needed for multifrequency dialing (MFC).

Receiver Module for Continuity Check (RM:CTC)The RM:CTC is necessary for testing CCS7 trunks.

Line/Trunk Unit (LTU)The LTU is a logical unit of the LTG. It contains different modules for special tasks.Possible module types are: Digital Interface Unit (DIU)

The DIU is used to connect PDC systems like PCM30 or PCM24. Local DLU/DSU Interface (LDI) (1)

The LDI is used to connect a local DLU/DSU by a 4 Mbps carrier Conference Unit (COUB for LTGG or COUC for LTGM/N) (1)

Multiparty conferences require the conference unit. The COUB module can handlefour conferences with up to eight subscribers each, the new COUC module has 32ports, which can be used in any combination (e.g. one conference with 14subscribers and two with 9 subscribers. Additionally, the COUC has on board echocompensation.

Digital Echo Compensator in D900 (DEC, not possible for LTGG) (1)A DEC is necessary for connections between mobile and fixed networks tocompensate the reflection and delay occurring with this connections.

Operationally Controlled Announcement Equipment (OCANEQ, yet only LTGG)The OCANEQ is used for standard and individual announcements. It can becontrolled by the switch or by subscriber inputs (OCANEQ and Code Receivers aspart of a User Interactive Dialog UI LTG).

Automatic Test Equipment ATE in EWSDAn ATE is used for trunk testing, mainly done for trunks on analog transmissionsystems

Code Receiver (1)Additionally to the Signal Unit SU the LTU may also contain CR: Different CRtypes are possible, e.g. for MFC:R2 or push-button dialing. The max. 8 codereceivers in LTU position may exist as extra modules (LTGG) or may be integratedon other LTG modules (LTGM/N).


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MDTOG in EWSD (1)This module is used to deliver the A-party number to analog wired subscribers ofthe exchange. The used method is called Frequency Shift Key FSK. A MDTOGcan be connected via SN to any analog DLU port of the EWSD exchange (poolsolution).

(1) only for LTG with functional type B

Group Switch (GS)The GS is a non-blocking space-time stage for 512 channels. The GS interconnectsthe LTU, SU, LIU and optional the SILC (via GP). The speech data can be attenuatedfor each channel in eight stages. Up to 64 conferences (three subscribers andaudible tones) are possible. GS for LTG with functional type B:

Beside the connection to LIU (8 Mbps), to the SU (2x2Mbps to TOG and 2Mbps toCR) and to the SILC the GS offers 8x32 ports for 8 LTU. How many of the LTU0-7can be equipped with HW modules depends on the LTG HW type. The remainingLTU can be used for specific applications which do not require HW.

GS for LTG with functional type C:Beside the connection to LIU (8 Mbps) and to the SU (2x2Mbps to TOG and2Mbps to CR) the GS offers 4x32 ports for 4 LTU. These LTU0-3 are normallyused as DIU.

GP

GS LIU

SU

LTU

LTU

LTU

SILC


8Mbps2Mbps

GCG

TOGRM:CTC

CR

DIULDI

DECCOU

OCANEQCR

MDTOGATE

Fig. 5 Internal structure of the LTG


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1.2.1 The LTGG

1.2.1.1 The LTGG in D900In the D900 system the LTGG can be used for any task, except the connection to thePSTN, because it is not possible to install a DEC in the LTGG. Since the newer LTGcan replace almost all LTGG tasks, it is mostly used for large conferences or as auser-interactive LTG for intelligent network (IN) functions.The LTGG consists of the following functional units: Signaling Unit (SU) Five Line/Trunk Units (LTU0 to LTU4) Group Switch and Link Unit (GSL) Group ProcessorFor the basic tasks, LTU0 to LTU3 hold a DIU for connection of PCM systems. LTU4can be used for a code receiver module. For large conferences, COUB modules canbe installed in LTU0 to LTU3. Both module types can be installed simultaneously.For connecting a DSU, DLU or ISDN primary access line, the SILCB module has tobe installed. If CCS7 trunks are connected, the RM:CTC module is necessary.

As a User Interactive LTG (UI-LTG), the LTGG holds the OCANEQ (operationallycontrolled announcement equipment). It is used as an announcement system, whichcan be controlled by the subscribers with MFC or even speech.The following special modules are used: OCE:SPM (OCANEQ speech controller and memory). This module stores and

controls the text fragments for the announcements. SCR (speech and code receiver) in LTU2 to LTU4 and SU. Each SCR module can

handle 8 calls.LTU0 remains empty, modules RM:CTC and SILCB are not used.In older systems, another OCANEQ type is installed. The used modules are: OCE:SPC (OCANEQ stored program control). This module controls the OCANEQ

equipment. OCE:MUP (OCANEQ memory unit). One or two memory units can be used to

store text fragments.The OCANEQ physically builds up a sequence of logical text fragments from itsspeech memory using text fragment numbers. It allows text fragments to be readusing access by means of text fragment numbers. Each OCANEQ operates 31speech channels and enables 16384 addressable text fragments to be stored.


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GP

GSL

SU

LTU0

LTU1

LTU4


TOGRM:CTC

CRSCR

DIUCOUB

PMUBCGSMSILCB

DIUCOUB

OCE:SPM

CRSCR

LTU2

LTU3

DIUCOUB

SCR

DIUCOUB

SCR

Only one module per LTU!

Fig. 6 Structure of the LTGG


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1.2.1.2 The LTGG in EWSDIn the EWSD system the LTGG can be used for all applications of the functionaltypes B and C except for the connection of V5.2 interfaces.The LTGG consists of the following functional units: Signaling Unit (SU) with TOG (can include RM:CTC function) and CR Four or five Line/Trunk Units

(LTU0 to LTU3 for LTGG in C function, LTU0 to LTU4 in B function) Group Switch and Line Interface Unit (GSL) Group Processor with PMU and CGSM; SILC only used in LTGG in B function

Equipping variants of LTGG: For the basic applications, LTU0 to LTU3 hold a DIU for connection of PCM

systems. For large conferences, COUB modules can be installed in LTU0 to LTU3. LTU4 can be used in LTGG in B function for:

an additional code receiver module with 8 CRPa MDTOG module

For connecting a DLU or ISDN primary access line, the SILCB module has to beinstalled.

If CCS7 trunks are connected, the RM:CTC function is necessary. It is eitherincluded in the TOG (TOGD module) or performed by an extra module.

The OCANEQ can be used as a standard or individual announcement systemintegrated in an LTGG in B function. It is controlled by the CP. The OCANEQphysically builds up a sequence of logical text fragments from its speech memoryusing text fragment numbers. It allows text fragments to be read using access bymeans of text fragment numbers. Each OCANEQ operates 31 speech channelsand enables 16384 addressable text fragments to be stored.Older HW solution:The used modules are the OCE:SPC (OCANEQ stored program control, thismodule controls the OCANEQ equipment, located in LTU 2/3) and the OCE:MUP(OCANEQ memory unit, one or two memory units can be used to store textfragments, located in LTU1-4). One OCANEQ can consist of a combination of1 OCE:SPC / 1 OCE:MUP or 1 OCE:SPC / 2 OCE:MUP.New HW solution:The used module is the OCE:SPM which includes functionality of OCE:SPC andOCE:MUP. It is located in LTU1.


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GP

GSL

SU

LTU0

LTU1

LTU4

TOGRM:CTC

CR

PMUBCGSMSILCB

LTU2

LTU3

Only one module per LTU!

SU

CRMCRM

LTGG (C)

4 Mbps

PDC

PDC

PDC

PDCpartnerexchange

DAS

SUCRP

LTGG (B)

SUCRP

LTGG (B)

SU

LTGG (B)

SU

LTGG (B)

DIUDIUDIUDIU

CRPDIUDIUDIUDIU

MDTOG

LDIBLDIB

COUBCOUBCOUBCOUB

OCEOCEATEDIUDIUDLU

PA

DLU

DLU

PDC

Fig. 7 Structure of the LTGG


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1.2.2 The LTGMThe LTGM is the current standard type for EWSD and D900 systems. It is used for alltasks except connection of OCANEQ. Only three modules are necessary for acomplete LTGM with four PCM systems connected. The 4 PCM are combined together with the current converter on the module

DIU120A. Logically, this module is treated as LTU0 to LTU3 with ordinary DIU30modules. Optionally, this module can be replaced by a DIU:LDIM module toconnect to a DLU or DSU via a 4Mbps local DLU interface.

The GPL module (group processor for LTGM) holds the PMU and, if required, theSILC functionality. Two different GP modules are used:GPL, Group processor for LTGM without SILC functionGPLS, Group processor for LTGM with SILC function

The GSM (group switch for LTGM) is a combination of GSL, TOG, RM:CTC, CRand GCG. Depending on the available on board components, different GSMmodules are used. The last three digits of the GSMabc modules define the moduletype. The 4rth character (called a) designates by Y the PCM30, by Z PCM24 (notyet implemented). For the 5th and 6th character the following applies:

Types of GSMabc modules

b c

A 8 times CRPC x x

B 8 times CRMR1 x x

C 8 times CRMR2 x x

D RM:CTC (4 CR only for continuity check) x

X no code receiver x x

Fig. 8 Variants of module GSM


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Example: GSMYDC holds 8 CRMR2 plus RM:CTC, GSMYAA holds 16 CRPC.

Additional fourth module in LTGM: the LTU:S of LTGM in B function D900: Additionally, a digital echo compensator (DEC120) or a large conference

unit (COUC) can be installed as LTU:S if the LTG is used for connecting thePSTN.

EWSD:a PHMA can be installed to connect an Access Network AN via V5.2 interfacean MDTOG can be installed to support the feature CLIP for analog subscribersa COUC can be installed to support large conferencesa MCT can be installed to support the mid call trigger functionan ATE:N can be installed as automatic test equipment

GPL

GSM8Mbps SDCto SN0 and SN1

*optional, 2x4Mbps link,for local DLU interface

GS,LIU,TOG,RM:CTC, CR,GCG

PMUSILC

LTU withDIU120 orDIU:LDIM*

LTU:SwithDEC120 orCOUC orPHMA orMDTOG orMCT orATE:N

Fig. 9 Structure of the LTGM


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1.2.3 The LTGNThe LTGN is the newest release of the LTG. Only the OCANEQ functionality is notyet implemented.Only one module makes up a complete LTGN for the basic tasks. The LTGNhardware combines almost every possible functional unit on this single module, e.g.different code receivers in logical LTU and SU positions.Depending on the application, different module types are used:

types of the LTGN

Name Type Memory SILC

GPNLE Local DLU Interface 64Mbyte yes

GPNLD Local DLU Interface 32Mbyte yes

GPNYE PCM30 64Mbyte yes

GPNYD PCM30 32Mbyte yes

GPNYC PCM30 16Mbyte no

GPNZE PCM24 64Mbyte yes

GPNZD PCM24 32Mbyte yes

GPNZC PCM24 16Mbyte no

Fig. 10 variants of the basic LTGN module


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Additional second module in LTGN: the LTU:S of LTGN in B function D900: Additionally, a digital echo compensator (DEC120) or a COUC (Conference

Unit C) can be installed . EWSD:

a PHMA can be installed as LTU5 if the LTG is used for connecting an AccessNetwork AN via V5.2 interfacea MDTOG can be installed as LTU5 if the LTG is used for supporting the featureCLIP for analog subscribersa COUC can be installed as LTU3 to support large conferencesa MCT can be installed to support the mid call trigger functionan ATE:N can be installed as automatic test equipment

Additional LTU:S modules, like OCANEQ, will be available in the future.

GS, LIU, TOG part

CR part

SILC part*


GP part

IOP part

GCG partDIU part

GPN

4xPCM30 or5xPCM24 or2xLDI (4Mbps)

LTU:S(optional)

DEC120COUCMDTOGPHMAMCTATE:N

* depending on module type

Fig. 11 Structure of the LTGN


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1.3 Rack and Frame LayoutsThere are a lot of possible rack types for combining different LTG with otherequipment like the switching network. Please refer to the maintenance manuals andsite-specific documentation for details.

Frame for LTGGAN LTGG uses one half of a standard frame (F:LTGG(A)). Up to 10 LTGGs can beinstalled in a rack. Each LTG has its own direct current converter.


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MOLOC Axxx

EWSD/D900: Frame for LTGG in B function, F:LTGG(A)

EWSD: If F:LTGG(A) is used for LTGG in C function, the mounting locations 028 and 086 (LTU4 of LTGG in B function) belong to the SU

and mounting locations 054 and 112 are empty (no SILC)

LTU0-LTU4 LTU0-LTU4

001 007 013 019 025 031 037 043 049 055 061 067 073 079 085 091 097 103 109 115 121

DIU

30, C

OU

B

DC

CD

E

DC

CD

E

DIU

30, C

OU

B

DIU

30, C

OU

B

DIU

30, C

OU

B

CR

P8, C

RM

8:R

2

TOG

GSL

CG

SM

PMU

D

SILC

B

CR

, RM

:CTC

DIU

30, C

OU

B

DIU

30, C

OU

B

DIU

30, C

OU

B

DIU

30, C

OU

B

CR

P8, C

RM

8:R

2

TOG

GSL

CG

SM

PMU

D

SILC

B

CR

, RM

:CTC

SU SU SU SUGP GP

Left LTGG Right LTGG

MOLOC Axxx

D900: Frame for LTGG as UI-LTG, F:LTGG(A)

LTU0-LTU4 LTU0-LTU4

001 007 013 019 025 031 037 043 049 055 061 067 073 079 085 091 097 103 109 115 121

DC

CD

E

DC

CD

E

OC

E:SP

M

CR

P8, S

CR

CR

P8, S

CR

CR

P8, S

CR

TOG

GSL

CG

SM

PMU

D

CR OC

E:SP

M

CR

P8, S

CR

CR

P8, S

CR

CR

P8, S

CR

TOG

GSL

CG

SM

PMU

D

CR

SU SU SU SUGP GP

Fig. 12 frame layout LTGG


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Frame for LTGMAs the LTGM has only three modules (four with the optional LTU:S), five LTG useone frame (F:LTGM(A)). Up to 30 LTGM can be installed in one rack. Each LTG hasits own current converter, located on the DIU120A or DIU:LDIM module.

Frame for LTGNThere are two different frame types for the LTGN. If the LTU:S function is not needed(e.g. ordinary PCM systems to other network nodes), 16 LTGN can be installed inone frame (F:LTGN(A)). Up to 64 LTG can be installed in a rack. When the LTU:S isnecessary (e.g. DEC or COUC), only eight LTG are possible (F:LTGN(B)). EachLTGN has its own on-board current converter.

LTGN concept for power supplyAll LTGN of one frame are connected to one pair of fuses. When one of the fusesfails all the LTGN keep on working using the power supply by the other fuse.

WARNINGSwitch of the current converter when changing modules of an LTGM or LTGN!


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

EWSD/D900: Frame for LTGM, F:LTGM(A) (LTU:S only for LTGM in B function)

DIU

120A

, DIU

:LD

IM

LTU

:S

GSM

GPL

, GPL

S

LTGM0

DIU

120A

, DIU

:LD

IM

LTU

:S

GSM

GPL

, GPL

S

DIU

120A

, DIU

:LD

IM

LTU

:S

GSM

GPL

, GPL

S

DIU

120A

, DIU

:LD

IM

LTU

:S

GSM

GPL

, GPL

S

LTGM1 LTGM2 LTGM3

DIU

120A

, DIU

:LD

IM

LTU

:S

GSM

GPL

, GPL

S

LTGM4

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

EWSD/D900: Frame for LTGN, F:LTGN(A)

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

GPN

LTGN0-LTGN15

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

EWSD/D900: Frame for LTGN, F:LTGN(B) (LTU:S only for LTGN in B function)

GPN

LTU

:S

GPN

LTU

:S

GPN

LTU

:S

GPN

LTU

:S

GPN

LTU

:S

GPN

LTU

:S

GPN

LTU

:S

GPN

LTU

:S

LTGN0-LTGN7

Fig. 13 Frames for LTGM and LTGN


SN2012EU07AL_0126


SN2012EU07AL_0127

2 MML Commands


SN2012EU07AL_0128

2.1 Interrogating the LTGThe following commands can be used to interrogate an LTG:

Interrogate the LTGDISP LTG : LTG= ;STAT LTG : LTG= ;DISP LTU : LTG= [ ,LTU= ] ;

For the various possible equipment installed in an LTG, different commands areused:

Interrogate hardware in an LTGSTAT DIU : LTG= [ ,DIU= ] [ ,OST= ] ;DISP CRMOD : LTG= [ ,CRMOD= ] ;STAT CR : LTG= [ ,LCPOS= ,CRPOS= ] ;STAT CR : LTG= ,OST= ;STAT COU : LTG= [ ,COU= ] [ ,OST= ] ;DISP CONFRNC : LTG= [ ,COU= ] ;DISP CONFL ;DISP MDTOG : LTG= ;STAT MDTOG : LTG= ;STAT OCANEQ : LTG= ;DISP OCANEQ : LTG= ,OCNO= ,DATA= ;DISP OCANEQ : LTG= ,OCNO= ,DATA= ,FRAGM= ;DISP OCAVAR : [ ,OCAVAR= ,LTG= ] ;

Most LTU types (like a DIU) consist of several hardware circuits called PORT. ADIU30 for example has 32 ports, the time slots of a PCM30 system. In mostapplications the ports can be displayed and configured separately or in a group ofports.

Interrogating portsDISP PORT : EQN= ;STAT PORT : EQN= [ ,OST= ] ;STAT PORT : LTG= ,LCPOS= [ ,OST= ] ;


SN2012EU07AL_0129

TAC4/D2MMPK1V9502-I21/003 99-01-27 13:38:102835 CA REMOTE#2 3102/01016

DISPLTG:LTG=X-X;

LTG TYPE LDPARP-----+------+------0- 2 LTGC 30- 9 LTGC 30-10 LTGB 410-11 LTGB 220-12 LTGB 220-13 LTGB 460-14 LTGB 46END JOB 2835


STATLTG:LTG=0-X; EXEC'D

NO: LTG CH0 CH1 NO: LTG CH0 CH1 NO: LTG CH0 CH1 NO: LTG CH0 CH1---------------- ---------------- ---------------- ----------------

0-2 ACT ACT STB 0-3 PLA0-4 PLA 0-5 PLA 0-6 PLA 0-7 PLA0-8 PLA 0-9 ACT STB ACT 0-10 ACT ACT STB 0-11 ACT STB ACT0-12 ACT STB ACT 0-13 ACT ACT STB 0-14 ACT STB ACT 0-15 PLA

0-56 PLA 0-57 PLA 0-58 PLA 0-59 PLA0-60 PLA 0-61 PLA 0-62 PLA 0-63 PLAEND JOB 2859


DISPLTU:LTG=0-14;

LTG LTU TYPE APPLIC MODVAR-----+----+-----+-------+---------------------------------------0-14 0 D30 CCSCCS 0-1 & 1-1 & 2-1 & 3-1 & 4-1 & 5-1 & 6-10-14 1 D30 CCSCCS 0-1 & 1-1 & 2-1 & 3-1 & 4-1 & 5-1 & 6-10-14 2 D30 CCSCCS 0-1 & 1-1 & 2-1 & 3-1 & 4-1 & 5-1 & 6-10-14 3 Y22 0-1 & 1-1 & 2-1 & 3-1 & 4-1 & 5-1 & 6-1END JOB 2906

Fig. 14 Interrogating the LTG


SN2012EU07AL_0130


STATDIU:LTG=0-14; EXEC'D

LTG DIU DIUTYPE APPLIC OST LTG OST DIU OST PCM-------+------+----------+-----------+-----------+----------+---------0-14 0 D30 CCSCCS ACT ACT ACT0-14 1 D30 CCSCCS ACT ACT ACT0-14 2 D30 CCSCCS ACT ACT ACTEND JOB 2919


DISPCRMOD:LTG=X-X;

LTG CRMOD TYPE-----+------+--------0- 9 0 RMCTC0-10 0 CRPC0-11 0 CRPC0-12 0 CRPC0-12 1 CRPCEND JOB 2932


STATCR:LTG=0-9;

LTG LCPOS CRPOS CRTYPE OST LTG OST CR--------+---------+--------+-----------+----------+------0- 9 0-0 RMCTC ACT ACT0- 9 0-1 RMCTC ACT ACT0- 9 0-2 RMCTC ACT ACT0- 9 0-3 RMCTC ACT ACT0- 9 6-0-0 CRMR2 ACT ACT0- 9 6-0-1 CRMR2 ACT ACT0- 9 6-0-2 CRMR2 ACT ACT0- 9 6-0-3 CRMR2 ACT ACT0- 9 6-1-0 CRMR1 ACT ACT0- 9 6-1-1 CRMR1 ACT ACT0- 9 6-1-2 CRMR1 ACT ACT0- 9 6-1-3 CRMR1 ACT ACT

END JOB 2945

Fig. 15 Interrogating DIU and code receiver


SN2012EU07AL_0131

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

MSC2/D2MMPK1V9502-I21/003 99-01-27 13:49:452957 CA REMOTE#2 2849/02821

DISPCONFRNC:LTG=0-14;

LTG COU COUTYP-----+-----+--------0-14 3 CONFLEND JOB 2957


DISPCONFL;

MAXIMUM NUMBER OF CONFERENCES

MAXSUB MAXOSS DEFSUB-------+-------+-------

8 4 8END JOB 2981

Fig. 16 Interrogating the conference unit


SN2012EU07AL_0132

2.2 Configuring the LTG

Configuring the LTGCONF LTG : LTG= ,OST= [ ,OLDOST= ] [ ,SUP= ] [ ,LOAD= ] ;CONF DIU : LTG= ,DIU= ,OST= ;CONF CR : LTG= ,LCPOS= ,CRPOS= ,OST= ;CONF COU : LTG= ,COU= ,OST= ;CONF OCANEQ : LTG= ,OCNO= ,OST= ;CONF MDTOG : LTG= , MDTOG= , OST= ;CONF PORT : LTG= ,LCPOS= ,CHPOS= ,OST= ;

WARNINGConfiguration of an active LTG to MBL may cause system failure or loss ofcalls! The better way is to configure the LTG to conditionally blocked (CBL)first. In this state, the LTG does not accept new calls, but connected calls arenot released. Wait for about five minutes, then configure the LTG to MBL.

LTG equipment like DIU, OCANEQ or COU can only be configured from ACT to MBLif the LTG itself is already MBL. The ports of a module can only be configured to MBLvia CBL.

Not all the ports of an LTG can be configured by the CONF PORT command. E.g.ports towards a DLU will be configured implicitly when configuring the related DLUsystem.


SN2012EU07AL_0133

PLA

ACT

MBL

NAC

UNA

CBLCAUTION!Loss of calls!


CONFLTG:LTG=0-14,OST=MBL;

STARTING CONFIGURATION FOR LTG -0-14 FROM ACT TO MBL

END TEXT 3579

3579CAUTION: THIS REQUEST MAY REMOVE THE SWITCHING MASKNO:10051PERIPHERY FROM SERVICE !DO YOU WANT IT TO BE EXECUTED ? (YES: +/NO: -) <+


CONFLTG:LTG=0-14,OST=MBL;

END OF CONFIGURATION FOR LTG -0-14 FROM ACT TO MBL

END TEXT 3579


CONFLTG:LTG=0-14,OST=MBL; EXEC'D

END JOB 3579

Fig. 17 Configuring the LTG


SN2012EU07AL_0134

ACT

MBL

PLA

UNA

CBLOnly if LTG is not active!


CONFDIU:LTG=0-14,DIU=2,OST=CBL; ACCEPTED

END TEXT 3556


CONFDIU:LTG=0-14,DIU=2,OST=CBL; EXEC'D

END JOB 3556


CONFDIU:LTG=0-14,DIU=2,OST=MBL; ACCEPTED

END TEXT 3561


CONFDIU:LTG=0-14,DIU=2,OST=MBL; EXEC'D

END JOB 3561

Fig. 18 Configuring a DIU, COU or OCANEQ


SN2012EU07AL_0135

ACT MBL

PLAUNA


CONFCR:LTG=0-9,CRPOS=0,OST=MBL; ACCEPTED

END TEXT 3751


CONFCR:LTG=0-9,CRPOS=0,OST=MBL; EXEC'D

END JOB 3751

Fig. 19 Configuring code receivers

In this example all four circuits of one logical code receiver module will be configuredat the same time to MBL (code receiver positions 0-0, 0-1, 0-2 and 0-3).


SN2012EU07AL_0136

ACT

MBL

PLA

UNA

CBL


CONFPORT:LTG=0-14,CHPOS=2,OST=CBL; ACCEPTED

END TEXT 3652


CONFPORT:LTG=0-14,CHPOS=2,OST=CBL; EXEC'D

END JOB 3652


CONFPORT:LTG=0-14,CHPOS=2,OST=MBL; ACCEPTED

END TEXT 3661


CONFPORT:LTG=0-14,CHPOS=2,OST=MBL; EXEC'D

END JOB 3661

Fig. 20 Configuring ports


SN2012EU07AL_0137

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


SN2012EU07AL_0138

2.3 Diagnosing the LTGTo diagnose the LTG, it must be configured to MBL first. Equipment like DIU or COUmust be configured to MBL, but the LTG has to be active or conditionally blocked.

Diagnosing the LTGDIAG LTG : LTG= ,TA= [ ,LOAD= ] ;DIAG DIU : LTG= ,DIU= ;DIAG CR : LTG= ,CRPOS= ,LCPOS= ;DIAG COU : LTG= ,COU= ;DIAG MDTOG : LTG=, MDTOG=;DIAG OCANEQ : LTG= ,OCNO= ;


SN2012EU07AL_0139

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


DIAGLTG:LTG=0-22,TA=ALL; ACCEPTED

END TEXT 4196


DIAGLTG:LTG=0-22,TA=ALL;

ERROR MESSAGE DURING CONFIGURATION OF LTG -0-22 MMN:MCH50-0000

NO REACTION TO CHANNEL ON /LTG

END TEXT 4196


DIAGLTG:LTG=0-22,TA=ALL;

ERROR MESSAGE DURING CONFIGURATION OF LTG -0-22 MMN:MCH50-0000

NO REACTION TO CHANNEL ON /LTG

END TEXT 4196


DIAGLTG:LTG=0-22,TA=ALL; NOT EXEC'D

REASON = HARDWARE FAULT

END JOB 4196

Fig. 21 Diagnose an LTG


SN2012EU07AL_0140

2.4 Creation of LTG HardwareTo create an LTG and LTG equipment, the following commands are necessary:

Creation of LTG hardwareCR LTG : LTG= ,TYPE= ,LDPARP= ;CR LTU : LTG= ,LTU= ,TYPE= ,APPLIC= [ ,MODVAR= ] ;CR LTU : LTG= ,LTU= ,TYPE= [ ,MODVAR= ] ;CR CRMOD : LTG= ,CRMOD= ,TYPE= ;CR MDTOG : LTG= ,MDTOG= ;CR CONFRNC : LTG= ,COU= ,COUTYP= ;

TIPAfter the creation, the LTG, CR, DIU etc. must be configured to active as shown insection 2.2. Don't forget to configure the ports of the installed equipment if necessary!

EWSDIn EWSD, LTG (LTGG, LTGM, LTGN) work normally as TYPE=LTGB orTYPE=LTGC. The parameter LDPARP defines inside a function type the LTG softwarefile (SY.PSW.Txx) which is loaded into the group processor.The values for the parameter LDPARP are project specific and can be seen from theproject documents. The following are frequently used values for the parameterLDPARP listed here as examples:

For all applications (except V5.2 interface) of function type B : LDPARP = 2 or 22 For function type B for V5.2 interface: LDPARP = 52 For all applications of function type C : LDPARP = 3 or 33

D900In D900 systems, all LTG (LTGG, LTGM, LTGN) work as TYPE=LTGB. Theparameter LDPARP defines the software which is loaded into the group processor:

Loadtypes for LTG in D900 systemsLDPARP Applications

22 DLU connection for wired subscribers with ISDN basic or primary access

41 Connection to BSS, DSU and DAS

46 Connection to PSTN, DSU, Loop-LTG, MPTY (conference unit)


SN2012EU07AL_0141

Example: To create an LTG for a connection to the base station system enterCRLTG:LTG=tsg-ltg,TYPE=LTGB,LDPARP=41;


CRLTG:LTG=0-22,TYPE=LTGB,LDPARP=41; EXEC'D

END JOB 4138


DISPLTG:LTG=X-X;

LTG TYPE LDPARP-----+------+------0- 2 LTGB 220- 9 LTGB 410-10 LTGB 410-11 LTGB 220-12 LTGB 220-13 LTGB 460-14 LTGB 460-16 LTGB 410-17 LTGB 460-19 LTGB 410-20 LTGB 410-22 LTGB 41END JOB 4304

X544/CTYCPZ1V1150/P21/110 98-05-15 11:34:36

7610 CA EWSD0 3102/01016

DISPLTG:LTG=X-X;

LTG TYPE LDPARP-----+------+------0- 2 LTGC 30- 3 LTGC 30- 4 LTGC 30- 5 LTGC 30- 6 LTGC 30- 7 LTGB 520- 8 LTGB 520-10 LTGB 220-11 LTGB 220-12 LTGB 220-13 LTGB 22

END JOB 7610

EWSD

D900

Fig. 22 Creating an LTG


SN2012EU07AL_0142

To create a module in a LTU, two variants are distinguished: With application (for DIU modules) Without application (for everything else)The following table shows examples of used values for the parameter TYPE.Acomplete list can be found in the maintenance manual construction.

Values for the TYPE parameterD30 DIU30 for PCM30 system

D24 DIU24 for PCM24 system

U07 OCANEQ equipment (OCE:SPM, OCE:SPC, OCE:MUP)

Y25 COUC for multiparty service (conference) in LTGM/N Ω V12

Y22 COUB for multiparty service (conference) in LTGG

V01 CRM8:R2, eight code receivers for MFC:R2 signaling

V15 MDTOG for CLIP for analog wired subscribers

PMA PHMA for LTGM/N to connect an AN via V5.2 interface

V02 CRP8, eight code receivers for pushbutton dialing

Creating a DIUFor creation of a DIU module, the parameter TYPE can be D30 for a PCM30 systemor D24 for a PCM24 system. Also, the parameter APPLIC must be defined:

Values for the parameter APPLICCCSCCS Common channel signaling No. 7 (ordinary trunks)

CASCAS Channel associated signaling (e.g. Loop LTG)

CCSDLU DLU or DSU signaling

EXTDLU DLU or DSU extension

CCSLDI Local DLU or DSU signaling (4Mbps interface)

EXTLDI Local DLU or DSU extension

CASRCA Channel associated signaling for recorded announcement machines

CCSPA Primary access signaling (large PABX)

Example: Create PCM30 system with CCS7 in LTU3:CRLTU:LTG=tsg-ltg,LTU=3,TYPE=D30,APPLIC=CCSCCS;


SN2012EU07AL_0143


CRLTU:LTG=0-22,LTU=3,TYPE=D30,APPLIC=CCSCCS; EXEC'D

END JOB 4284


DISPLTU:LTG=0-22;

LTG LTU TYPE APPLIC MODVAR-----+----+-----+-------+---------------------------------------0-22 3 D30 CCSCCS 0-1 & 1-1 & 2-1 & 3-1 & 4-1 & 5-1 & 6-1

END JOB 4359

Fig. 23 Creating a DIU

TIPThere are also LTU types existing which do not require a HW module. These LTUtypes reserve ports of the group switch in order to create e.g. SW for test functionslike the Trunk/Line Workstation TLWS.

TIPCreation of LTU for further modules in LTGM/N

Creation of MDTOG located in LTU:SCR LTU: LTG= , LTU=5, TYPE=V15;

Creation of LTU for COUCCR LTU: LTG= , LTU=3, TYPE=Y25;

Creation of LTU for PHMACR LTU: LTG= , LTU=5, TYPE=PMA;


SN2012EU07AL_0144

Creating a CR in an LTG G/M/N For the code receivers in the signaling unit, the parameter CRMOD identifies the

code receiver module number . For the parameter TYPE, the following inputs arepossible:

Code receiver types for the signaling unit

CRPC Code receiver for pushbutton CEPT

CRMR1 Code receiver for MFC:R1 signaling

CRMR2 Code receiver for MFC:R2 signaling

CRMSC Code receiver for MSC signaling

RMCTC Receiver module for continuity check

Creating a CR in B function Maximal 8 code receiver circuits assigned to two logical code receiver modules

may be created in signaling unit position:CRCRMOD: LTG = tsg-ltg, CRMOD = 0,TYPE = CRPC;CRCRMOD: LTG = tsg-ltg, CRMOD = 1,TYPE = CRPC;CONFCR: LTG = tsg-ltg, CRPOS = 0,OST = MBL;CONFCR: LTG = tsg-ltg, CRPOS = 1,OST = MBL;CONFCR: LTG = tsg-ltg, CRPOS = 0,OST = ACT;CONFCR: LTG = tsg-ltg, CRPOS = 1,OST = ACT;

Creation and configuration of 8 further code receivers in an LTU position:The second possibility is to create a code receiver module in an LTU. Theparameter TYPE can be found in the MMN construction.Example: Create 8 pushbutton code receivers in LTU6 of an LTGM/N:CRLTU: LTG = tsg-ltg, LTU = 6, TYPE = V02;CONFCR: LTG = tsg-ltg, LCPOS = 6-0, OST = MBL;CONFCR: LTG = tsg-ltg, LCPOS = 6-1, OST = MBL;CONFCR: LTG = tsg-ltg, LCPOS = 6-0, OST = ACT;CONFCR: LTG = tsg-ltg, LCPOS = 6-1, OST = ACT;

WARNINGIn case of LTGG the LTU 4 must be used.


SN2012EU07AL_0145


CRCRMOD:LTG=0-22,CRMOD=0,TYPE=CRPC; EXEC'D

END JOB 4285


DISPCRMOD:LTG=0-22;

LTG CRMOD TYPE-----+------+--------0-22 0 CRPC

END JOB 4370

16 code receivers for LTGM/N in B function:

CRCRMOD:LTG=tsg-ltg,CRMOD=0,TYPE=CRPC;

CRCRMOD:LTG=tsg-ltg,CRMOD=1,TYPE=CRPC;

CONFCR:LTG=tsg-ltg,CRPOS=0,OST=MBL;

CONFCR:LTG=tsg-ltg,CRPOS=1,OST=MBL;

CONFCR:LTG=tsg-ltg,CRPOS=0,OST=ACT;

CONFCR:LTG=tsg-ltg,CRPOS=1,OST=ACT;

CRLTU:LTG=tsg-ltg,LTU=6, TYPE=V02;

CONFCR:LTG=tsg-ltg,LCPOS=6-0, OST=MBL;

CONFCR:LTG=tsg-ltg,LCPOS=6-1, OST=MBL;

CONFCR:LTG=tsg-ltg,LCPOS=6-0, OST=ACT;

CONFCR:LTG=tsg-ltg,LCPOS=6-1, OST=ACT;

16 code receivers for LTGG/M/N in C function:

CRCRMOD:LTG=tsg-ltg,CRMOD=0,TYPE=CRMR2;




CONFCR:LTG=tsg-ltg,CRPOS=0 (&1&4&5),OST=MBL;

CONFCR:LTG=tsg-ltg,CRPOS=0 (&1&4&5),OST=ACT;

Fig. 24 Creating a code receiver

Creating a CR in an LTG G/M/N in C function (for EWSD only):All code receivers are created with CRCRMOD in signaling unit position. Up to 16code receiver circuits assigned to 4 logical code receiver modules are possible.With CCS7 the type RMCTC for the continuity check should be used. The use of thetype RMCTC is restricted to 4 code receiver circuits using code receiver modulenumber 0.


SN2012EU07AL_0146


SN2012EU07AL_0147

3 Exercise


SN2012EU07AL_0148


SN2012EU07AL_0149

Exercise 1Title: Questions about the Line Trunk Groups

Objectives: The participant is able to explain the main functions and characteristics of the LTG

Pre-requisite: None

Task

Please answer the following questions

Query Which LTG HW types can be used for:

Connection of DLU/DSU?OCANEQ?

How is the LTG connected to the switching network?

Explain the "cross office check"!

What main tasks does a GP realize in an LTG?

What task has the SILC function?

Give examples for tones generated by the TOG during connection set up!

What are the tasks of the CRP and CRM function ?

What are the tasks the LIU function has to fulfill as interface to the SN ?


SN2012EU07AL_0150


SN2012EU07AL_0151

Exercise 2Title: Standard HW Fault Clearance LTG: Hands On Training

Objectives: The participant is able to perform the LTG fault clearance tasks of a network element

manager

Pre-requisite: Training exchange or Computer Based Simulator isavailable

MMN, CML and ECD

Task

Perform fault clearance for a given example!

Query

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


SN2012EU07AL_0152


SN2012EU07AL_0153

4 Solution


SN2012EU07AL_0154


SN2012EU07AL_0155

Solution 1Title: Questions about the Line Trunk Groups

Objectives: The participant is able to explain the main functions and characteristics of the LTG

Pre-requisite: None

Task

Please answer the following questions

Query Which LTG HW types can be used for:

Connection of DLU/DSU? LTG G/M/N

OCANEQ? LTG G

How is the LTG connected to the switching network?8Mbps SDC

Explain the "cross office check"!Check of the speech channel from the A-LTG across the SN to the B-LTG andvice versa.

What main tasks does a GP realize in an LTG?Communication with the CP (Adaptation of the message formats).Control of the LTG functional units.

What task has the SILC function?Safeguarding layer for DLU/DSU/PA communication

Give examples for tones generated by the TOG during connection set up!Dial tone, busy tone, ringing tone

What are the tasks of the CRP and CRM function ?CRP: translation of the DTMF, CRM: translation of the MFC

What are the tasks the LIU function has to fulfill as interface to the SN ?Duplication to the SDC (outgoing), selection of the SDC (incoming), handling ofthe message channel, cross-office-check


SN2012EU07AL_0156

line trunk group (ltg) - fiek.yolasite.comfiek.yolasite.com/resources/03_sn2012eu07al_01_ltg.pdf ·...

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