07 RN28197EN14GLN00 A Interface Integration

RN28173EN13GLN01 © Nokia Siemens Networks

A Interface Integration with MMLBSS S14


A Interface Integration

This module describes the A interface signalling hierarchy and traffic channel distribution within the BSC. Following this module you should be able to use the BSS Integration reference material to create an A interface connection as detailed below:

• Connecting the A interface ET

• Creating the transcoder devices

• Creating the MTP

• Creating the SCCP

• Creating the speech channels


A interface configuration

BSCMSC

1 FR2 FR3 FR4 FR

1 HR2 HR3 HR4 HR5 HR6 HR7 HR

A Interface

GSWS

Highway PCM

Highway PCM

TCSM


Steps to integrate the A interface

Connect the A interface ET

Create the transcoder unit

Create the MTP

Create the SCCP and BSSAP

End

Start

Create the speech channel

CCS7 signalling


Connect the A interface ET

Create ET plug-in unitno

yes

PIU exists?

Start

Check ET settings and change them if necessary

ET connected to the right IF

Connect ETno

yes

Change working state

End


Identify connected ET-Interface

< ZWUP:32&40&96;

LOADING PROGRAM VERSION 18.10-0

EXECUTION STARTED

BSC3i BSC11 2005-04-21 10:03:36

PCM COMP PROC INFO_1 INFO_2 INFO_3 ADD_INFO PAGE 1 32 BCSU SC7PRB ETPCM - - VIRTUAL_PCMS 33H 01B1H 0000H 0000H 0100H 1280 40 BCSU ERATES ETPCM - - 33H 010AH 0000H 0000H 0000H 96 BCSU ABIPRB ETPCM - - VIRTUAL_PCMS 30H 01BFH 0000H 0000H 0000H 1792 - 1799

TOTAL OF 3 PCM CIRCUITS


Steps to create the TCSM2 unit

Create transcoder rack

Create functional unit for ET and TCSM

Create plug-in units for ETs, TR16s and TRCO

Connect ETs and TRCO

Change TCSM working state

Add through connections

no

no

yes

Start

Create cartridges for ETs and TCSM

Rack exists?

TCSM usedfor CCS7 or X.25

End

yes


TCSM2 rack and cartridges

ET indexes and tracks: (higher part)

ETs 0 and 1: track 0ETs 2 and 3: track 1ETs 4 and 5: track 2ETs 6 and 7: track 3ET indexes and tracks: (lower part)

ETs 0 and 1: track 4ETs 2 and 3: track 5ETs 4 and 5: track 6ETs 6 and 7: track 7

Coordinates of the cartridges

ET 0: nnc 120-01 nn=rowET 1: nnc 120-13 c = rackET 2: nnc 120-49ET 3: nnc 120-61TC1C 0: nnc 088-01TC1C 1: nnc 088-37TC1C 2: nnc 058-01TC1C 3: nnc 058-37TC1C 4: nnc 030-01TC1C 5: nnc 030-37TC1C 6: nnc 002-01TC1C 7: nnc 002-37

TC1C 0

TCSM2 0

TC1C 1

TCSM2 1

TC1C 2

TCSM2 2

TC1C 3

TCSM2 3

TC1C 4

TCSM2 4

TC1C 5

TCSM2 5

TC1C 6

TCSM2 6

TC1C 7

TCSM2 7

0(TCSM2 0)

1(TCSM2 2)

(TCSM2 1)(TCSM2 3)

2(TCSM2 4)

3(TCSM2 6)

(TCSM2 5)(TCSM2 7)

POWER INPUT BLOCK

TRC0

0

TR16

1

TR16

2

TR16

3

TR16

4

TR16

5

TR16

6

TR16

7

TR16

8

TR16

9

TR16

10

TR16

11

TR16

12

TR16

13

TR16

14

PSC1

15tracks:

ET2E0

ET2E4

ET2E1

ET2E2

ET2E3

ET2E5

ET2E6

ET2E7

tracks:

tracks:

ET1TCTCSM2

TC1C


Steps to create the TCSM3i unit

Create transcoder cabinet

Create TCSM functional unit

Create plug-in units : ETs in ET16, TR3 and CL3TG

Connect TR3 to BSC

Change TCSM working state

Add through connections

no

no

yes

Start

Create cartridges for ETs, cabinet clock and TR3

Cabinet exists?

TCSM usedfor CCS7?

End

yes


Stand-Alone TCSM3i

1 2 3 4

5 6 7 8

9 10 11 12

1 3

5 7

9 11

1

2

3

4

5

6

7

8

9

10

11

12


Standalone TCSM3i

1

1

2 3 4

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16

2 34

1,2,3,4,5,6,7,89,10,11,12,13,14,15,16

Only 1 BSC can be connected

because of 1 Ater ET piu

2 BSC’s can be connected

because there are 2 ATER piu’s

5 6 7 8

5

ETC0 ETC1 ETC2

TC2C-0 TC2C-1

1_2_3_4_5_6_7_8

Indexes

6

1_2_3_45_6_7_89_10_11_1213_14_15_16 1_2_3_4

7

5_6_7_89_10_11_1213_14_15_16

8

1_2_3_4_5_6_7_81_2_3_4_5_6_7_8

Ater IF ET’s

A IF ET’s


Standalone TCSM3i

9

1

10 11 12

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16

2 34

1,2,3,4,5,6,7,89,10,11,12,13,14,15,16





13 14 15 16

5

ETC0 ETC1 ETC2

TC2C-2 TC2C-3

Indexes

6

1_2_3_45_6_7_89_10_11_1213_14_15_16 1_2_3_4

7

5_6_7_89_10_11_1213_14_15_16

89

1_2_3_4_5_6_7_8

10 11

1_2_3_4_5_6_7_8

12

1_2_3_4_5_6_7_8

13 14 1516


Standalone TCSM3i

17

1

18 19 20

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16

2 34

1,2,3,4,5,6,7,89,10,11,12,13,14,15,16





21 22 23 24

5

ETC0 ETC1 ETC2

TC2C-4 TC2C-5

Indexes

6

1_2_3_4 5_6_7_89_10_11_1213_14_15_16 1_2_3_4

7

5_6_7_89_10_11_1213_14_15_16

89 10 111213 14 1516

1_2_3_4_5_6_7_8

17 1819 2021 2223 24

1_2_3_4_5_6_7_81_2_3_4_5_6_7_8


Standalone TCSM3iTR3E/TR3A/TR3T roles when using ETIP

• For standalone TCSM3i user can use ET16 or ETIP for Ater and A interface.

• If ETIP using ETIP, the role of TR3E/TR3A/TR3T will slightly changed as follow:

* acts as a cartridge master when two BSCs are connected to one cartridge


Three layers of CCS7 signalling

BSSAP

SCCP

MTP

BSSAP

SCCP

MTP

MSC

TCSM

BSC


Creating MTP and adding signalling link

Create signalling point code

Create signalling link set including sign. link

Create signalling route set

Allow activation of signalling link

Change signalling link state

Allow activation of signalling route

Change route set state

Create signalling link

Yes

Start

MTP exists?

End

Add signalling link to link set

Allow activation of signalling link

Change signalling link state


MTP layer

MSC 3

SPC=1234

MSC 1

SPC=1233

BSC

SPC=1223

Signalling Link

Signalling Link Set

Signalling Route Set

MSC 2

SPC=1235

e.g. TS 16

e.g. TS 31

SLC=0

e.g. TS 31

SLC=1


Creating of SCCP and the subsystem BSSAP

Create remote SCCP and local Subsystem BSSAP (FE)

Modify broadcast status of SCCP signalling points

Modify local broadcast status of SCCP subsystems

Change local and remote SCCP state

Start

Create local SCCP and local Subsystem BSSAP (FE)

End

Create service for CONS (10F) and CLNS (208)

Change local and remote Subsystem state


BSS Application Part: BSSMAP and DTAP

BSSMAP: BSS Management Application PartDTAP: Direct Transfer Application Part

TCSM BSC BTS

MS

MTP

MSC

MTP

SCCP SCCP

BSSAPBSSAP

BSSMAP DTAP


Creating speech channels

Add circuits to the circuit group

Change the state of the speech circuits

yes

Start

End

no

Circuit groupexists?

Create a circuit group


Speech circuits

BSC

TCSM

NCGR=MSC01TCPCM-1

TCPCM-2

TCPCM-3

GSWBETPCM-36

ET-36

MSC


Exercise: A interface integration

BSC

SPC=.............

TCSM...... ET.....

MSC

SPC=.............

CCS7 in TSL16

CCS7 in TSL.......Link set=..............SLC=......Sign. network=........

Codec=CCSPCM=......CGR=........


A Interface using SIGTRAN protocol stack

M3UA

IP

SCTP

Ethernet

M3UA

BSSAP

IP

SCTP

Ethernet

SCCP SCCP

BSSAP

BSC MSC

SigtranSigtran


• Sigtran defines a standardized way of carrying any SS7 signalling over IP networks

• Defines retransmission and reordering functionalities

• Physical layer can be any layer 1 technology

Ethernet/SDH/etc.

IP

SCTP

M3UA

Application

Physical layer

Transport layer

Signallingadaptation

Sigtran signalling stack

Application can be

ISUP, BICC, SCCP, etc.

Sigtran - Signalling over IP


IP

SCTP

Appli-cation

L1

L2

Stream Control Transmission Protocol ( SCTP)

Services by SCTP:

• provides reliable data transfer between two IP end points

• It offers acknowledged error-free non-duplicated transfer of datagrams (messages).

• Detection of data corruption, loss of data and duplication of data is achieved by using checksums and sequence numbers.

• A selective retransmission mechanism is applied to correct loss or corruption of data.


Different adaptation layers possible

• - M2UA (MTP2 user adaptation layer)

• - M3UA (MTP3 user adaptation layer)

• - SUA (SCCP user adaptation layer)

M3UA supported in the 1st implementation of Rel4M3UA (MTP3 User Adaptation) provides MTP3 user adaptation for upper layers to use

IP

SCTP

SUA

TCAP

MAP

IP

SCTP

M3UA

SCCP

TCAP

MAP

M3UA – MTP3 User Adaptation


DX200

Association Set (up to 16 associations)

SCTP Association

Signaling Link Set can only contain one "Sigtran link". "Sigtran link" consists of one SCTP association set. Association is identified by the computer unit and destination address. Only one association allowed per computer unit.

Signalling point B

IP

Signalling point A

MSC (Server) BSC (Client)

CCSU_0

CCSU_1

CCSU_2

CM

SPC_1

BCSU_0

BCSU_1

BCSU_2

MCMU

IP Addresses SPC_2

Addressing based on

SPCs!

Sigtran Terms and Concepts


Steps of creating A-IF SIGTRAN in BSC

1. Create IP network interface for BCSU ( ZQRN)2. Create an SCTP parameter set for SIGTRAN ( ZOYE)3. Create an association set ( ZOYC)4. Add associations to association set ( ZOYA) 5. Configure association IP ( ZOYP)6. Configure source IP address for SCTP ( ZOYN)7. Check associations ( ZOYI )8. Modify associations if needed ( ZOYM)9. Create Signalling Link Set and IP signalling link ( ZNSP )10. Create Signalling Route Set ( ZNRC )11. Allow and activate IP signalling link ( ZNLA&ZNLC )12. Allow and activate signalling route ( ZNVA & ZNVC )13. Create SCCP service ( ZNPC )14. Create local SCCP & Subsystem ( ZNFD )15. Create remote SCCP & subsystem ( ZNFD )16. Activate Local & Remote SCCP ( ZNGC )17. Activate Local & Remote SCCP subsystem ( ZNHC )


Ater Connection to MGW


Ater – IF to MGW

• MGW implements the same base transcoding functionality and

features as TCSM2.

• MGW doesn’t support 8kbit/s submultiplexing on Ater

• No O&M LAPD between BSC and MGW.

• No need to equip TCSM unit into BSC HW database

• User is responsible for creating identical transcoder configurations

to both BSC and MGW.


Step Create Ater IF to MGW in BSC:

1. Create ET ( ZWTU, ZWTP)2. Connect ET to A-IF ( ZWUC )3. Activate ET ( ZUSC )4. Set number of through connected channels ( ZWGS )5. Create TC-PCM ( ZWGC)

07 RN28197EN14GLN00 A Interface Integration

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