10 rn2819aen20gla0 a interface integration
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8/10/2019 10 RN2819AEN20GLA0 a Interface Integration
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A Interface Integration with MMLRG20 (BSS)
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Objectives
After completing this learning element, the participant should be able
to:
Describes the A interface signalling hierarchy and traffic channel distribution within the BSC
Use the BSS Integration reference material to create an A interface connection
Integrate the Ater and A interfaces
Create the Standalone TCSM unit
TCSM3i and Combi TCSM Configuration and TR3 roles
Create TCSM3i hardware in Master BSC
Create Combi TCSM unit in Master and Remote BSC
Create connecting the A interface ET
Explain and Congfigure Ater Interface in MGW
Creating the CCS7 signalling (MTP, SCCP, BSSAP, BSSMAP and DTAP)
Creating the speech channels and interrogate A interface parameters Explain SIGTRAN (SCTP, M3UA) concept and creating A interface SIGTRAN in BSC
Refer to RG20 Documentation:
Integrate and configure\ BSS Integration
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A/Ater interfaces configuration
BSC
TCSM
FR
FR
FRTCSM
TCPCM-1
TCPCM-1
TCPCM-3
TCPCM-2
CCSPCM-0
CCSPCM-1
CCSPCM-2
CCSPCM-3
MGW
FR
FR
FRTCPCM-3
TCPCM-2
CCSPCM-4
CCSPCM-5
FR TCPCM-3
FR TCPCM-3
CCSPCM-5
CCSPCM-6
Ater InterfaceA Interface
Note:
For TCSM2, max 4 PCMs connecting to A-IF for FR traffic, max 7PCMs for HR traffic.
For TCSM3i, max 4 PCMs to A-IF.
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Steps to integrate the Ater and A interfaces
CCS7 signalling
Connect the Ater interface ET
START
Create the transcoder unit
Configure MTP layer
Configure SCCP and BSSAP
Create speech channels
END
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TCSM3i Solution architecture
configuration options:
Standalone TCSM3i ET16 (Ater) ET16 (A) Standalone TCSM3i ETIP1-A (Ater) ET16 (A)
Standalone TCSM3i ET16 (Ater) ETP-A (A)
Standalone TCSM3i ET16 (Ater) ETIP1-A (A)
Standalone TCSM3i ETIP1-A (Ater) ETP-A (A)
Standalone TCSM3i ETIP1-A (Ater) ETIP1-A (A)
Combined Installation ETS2/ ETIP1-A / ETP-A
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Connect the Ater interface ET
yes
Create cartridges for ETs and TR3
PIU exists?
START
Create ET PIU
ET connected tothe right IF?
Connect ET
ye s
no
no
Check ET settings and change them if necessary
Change working state
END
-Create an ET with the ZWT command group.
-Connect the ET with the ZWUC command.
-If necessary, modify the ET settings with the ZYEC command and change theworking state (ZUSC) to WO-EX.
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Identify connected ET-Interface
< ZWUP:32&35&40&96;
BSC3i
PCM COMP PROC INFO_1 INFO_2 INFO_3 ADD_INFO PAGE 132 BCSU SC7PRB ETPCM - - VIRTUAL_PCMS
33H 01B1H 0000H 0000H 0100H 128035 - EQMANA - - -
FFH 01C5H 0000H 0000H 0000H40 BCSU ERATES ETPCM - -
33H 010AH 0000H 0000H 0000H96 BCSU ABIPRB ETPCM - - VIRTUAL_PCMS
30H 01BFH 0000H 0000H 0000H 1792 - 1799
TOTAL OF 3 PCM CIRCUITS
If the ET is already connected, it has a controlling BCSU (Base Station ControllerSignalling Unit) and process info. The controlling process can be
-SC7PRB: A interface
-ABIPRB: Abis interface
-ERATES: Gb interface
EQMANA means the ET is not connected.
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Steps to create the Standalone TCSM unit
Create cabinet clock cartridgeno
no
yes
yes
Change TCSM working state
Create TC PCM and connect TR3 to BSC
Create plug-in units : ET16, TR3 and CL3TG
Create TCSM functional unit
Create cartridges for ETs and TR3
Add through connections
Cabinet exists?
TCSM usedfor CCS7?
START
END
Create transcoder cabinet
Note:
TCSM3i has 4 different types:
a) Cabinet Head Master: create CL3TG *2+TR3*1b) Cartridge Master: create ET16 for A-IF*1+ ET16 for Ater-IF*1+TR3*1
c) Master: create ET16 for A-IF *1+ TR3*1
d) Normal: create TR3*1
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TCSM3i Configuration in RG20 (1/2)
Fan trayFan tray Fan trayFan tray
Fan trayFan tray Fan trayFan tray
TCSMTCSM
PDFUPDFU PDFUPDFU
TCSMTCSM
TCSMTCSM TCSMTCSM
TCSMTCSM TCSMTCSM
TCSMTCSM TCSMTCSM
TCSMTCSM TCSMTCSM
ETET
ETET
ETET ETET
ETET ETET
ETET ETET
CLS
CLS
ETETCLS
CLS
ETETTCSM TransCoder SubMultiplexerunits
CLS Clock & Synchronization Units
ET Exchange Terminal Units
PDFU Power Distribution Fuse Unit
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TCSM3i configuration in RG20 (2/2)
TR3 PIUs
Group 1
Ater IF ETsfor Group 1
A IF ETsfor Group 1
Each group consists of 4 TR3 PIUs. Each TR3 is a different TCSM.
The TR3 groups are backplane connected to the correspondent A IF PIU(four ETs for each TR3) and to the Ater IF PIU (one ET for each TR3).
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YesNoYesNo4,8,12,16,31
,35,39
A ETIP/ETP master
NoYesYesNo3,7,11,15,
30,34,37
Ater ETIP master
YesYesNoYes(1),5,9,13,
28,32,36
ET16 Master
YesYesYesYes2Cabinet headmaster
YesNoNoYes1(,9), 28Cartridge master
A ETIP/ETP,Ater ET16,
mixed
Ater ETIP, AET16, mixed
All ETIP (orETP on A
interface +
ETIP Ater)
All ET16,Normal
TrackRole
TR3 Roles in TCSM3i
Refer to RG20 Documentation:
BSC/TCSM descriptions\ Product Description of TCSM3i HighCapacity Transcoder Submultiplexer
Note:
TCSM3i has 4 different types:
a) Cabinet Head Master: create CL3TG *2+TR3*1
b) Cartridge Master: create ET16 for A-IF*1+ ET16 for Ater-IF*1+TR3*1
c) Master: create ET16 for A-IF *1+ TR3*1
d) Normal: create TR3*1
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Combi TCSM configuration
AInterface
Master BSC MSC/MGWCombi TCSM3i
SBMUX
SETSTM1/OC3
GSW2KB Hotlink
TR3Ts
SET
SET
Remote BSC
ET
ET
Remote BSC
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Create STMU units and PIUs
Create CLAB cartridge, units and PIUs
Create TC Rack (TCSA cartridge) and FAN trays
Create GSW units and PIUs (SBMUX)
Create GT4C_A cartridges (for STMU and GSW)
Create TCSM cartridges, units and PIUs
Create the A-interface ET units into the STMU
Connect TR3 to BSC (Create TC-LAPD)
Connect ETs to BSC (Create ET-LAPD)
Change working state of ETs to WO-EX
START
Steps to create the Combi TCSM unit in Master BSC(1/2)
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Run diagnostics
Set the number of through connections if needed
Create the TC-PCMs
Change working state of TCSM to WO-EX
Change working state of TCSM to TE-EX *
Create the through connections if needed
Steps to create the Combi TCSM unit in Master BSC(2/2)
END
*) The TR3 starts downloading its software from the BSC
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Create Master TC Rack (TCSA cartridge)
Create TCSM cartridges, units and PIUs
Connect TR3 to BSC (Create TC-LAPD)
START
Steps to create the Combi TCSM unit in Remote BSC
Run diagnostics
Set the number of through connections if needed
Create the TC-PCMs
Change working state of TCSM to WO-EX
Change working state of TCSM to TE-EX *
Create the through connections if needed
END*) The TR3 starts downloading its software from the BSC
ZWTP:TCSM,512:TR3T,0,2::GENERAL,8,512,TSL,1:REMOTE,8,512,NO;
ZWTP:TCSM,576:TR3T,0,2::GENERAL,8,576,TSL,1:REMOTE,8,576,NO;
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Combi TCSM unit configuration in Remote BSC
< WTI:P:TCSM,512;
EXECUTION STARTED
READING DATA FROM DATABASE ...
TCSM-512 IN LOC 1C002-00
TR3E 0 TRACK: 2
MS: ME: IS: IE:
INT: SW:
TSLS 30 20 10 0
GENERAL 8M PCM: 512 B 00000000000000000000000000000010
R 00000000000000000000000000000010
REMOTE 8M PCM: 512 B 00000000000000000000000000000000
R 00000000000000000000000000000000
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Steps to create TCSM3i hardware in Master BSC
Check ET unit states and configuration
Create Circuit groups on Master BSC
Add circuits to circuit group
Create broadband connection
Check status of line interfaces (SET)
ZUSI; ZWUP
ZRCC
ZRCA
ZRBA
ZRCI
ZRCI
ZRBI
ZUSI:SET;
ZRCC:TYPE=SPE,CGR=20,NCGR=WB75:FORMAT=0,HUNTED=N,:;
ZRCC:TYPE=SPE,CGR=30,NCGR=TCWB75:FORMAT=0,HUNTED=N,:;
ZRCA:CGR=20:CRCT=512-1&&-31:;
ZRCA:CGR=30:CRCT=1665-1&&-31:;
ZRBA:CRCT=512-1:CRCT=1665-1:BW=31:BI:;
START
END
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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
ye s
Start
Create cartridges for ETs and TCSM
Rack exists?
TCSM usedfor CCS7 or X.25
End
yes
Note:
Create one ET plug-in unit for each PCM line connected to the transcoder.
Create two TR16 plug-in units for each A interface PCM line connected to thetranscoder.
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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 2
ETs 6 and 7: track 3
ET indexesand tracks: (lowerpart)
ETs 0 and 1: track 4ETs 2 and 3: track 5ETs 4 and 5: track 6ETs 6 and 7: track 7
Coordinatesof the cartridges
ET 0: nnc 120-01 nn=row ET 1: nnc 120-13 c = rack ET 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
T
RC0
0
T
R16
1
T
R16
2
T
R16
3
T
R16
4
T
R16
5
T
R16
6
T
R16
7
T
R16
8
T
R16
9
T
R16
10
T
R16
11
T
R16
12
T
R16
13
T
R16
14
P
SC1
15tracks:
E
T2E0
ET2E4
E
T2E1
E
T2E2
E
T2E3
ET2E5
ET2E6
ET2E7
tracks:
tracks:
ET1TCTCSM2
TC1C
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Ater Interface in MGW
In GSM networks, transcoding is part of the base station subsystem, while in theWCDMA architecture, the transcoding functionality is specified to be part of thecore network. In the NSN WCDMA solution, transcoding is located in MGW.
As MGW includes the transcoders for WCDMA, the same investment can be usedalso for GSM, as MGW supports the GSM transcoding functionality and the MSSSystem is applicable for both WCDMA and GSM. Therefore, this solution is offeredas an alternative to the current transcoder product for NSN system customers.
In this case, the BSC is integrated to MGW directly with Ater IF, using E1/T1 orSTM-1/OC-3.
All critical TC functions currently provided by NSN 2G transcoder are supported.These functionalities include, for example, TRAU framing, synchronisation, timealignment, multi-rate functionality,
Ater in MGW supports the following voice and data services: GSM transcoding (FR, HR, EFR, AMR, AMR WB) and sub-multiplexing (16/32/64 kbit/s)
speech enhancement features, for example, acoustic echo cancellation (AEC), automatic
level control (ALC) tandem free operation (TFO) for FR, HR, EFR, AMR, and AMR WB codecs
special functions, for example, text telephony (TTY)
the following circuit pools are supported: 1, 3, 5, 7, 10, 13, 20, 21, 22, 23, 28, 32 and 37
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TCSM versus transcoder in MGW MGW does not support the same pool sets as the TCSM3i.
Since there is no O&M link between the BSC and MGW, operations like transcoding
alarm monitoring and SW changes have to be performed in the MGW. Furthermore,
BSC-originated routine testing and diagnostics cannot be used with MGW.
Exactly the same pool configuration have to be created in the BSC and MGW
separately.
No transcoding related hardware have to be created in the BSC.
Refer to RG20 Documentation:
Administer\ Managing the BSS Transmission\ Configuring a newtranscoder\ Configuring an Ater Interface with the MGW
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Steps to configure Ater on MGW
yes
ET exists?
START
Create ET
ET connected tothe right IF?
Connect ET
yes
no
no
Create TC PCMs
END
Refer to RG20 Documentation:
Administer\ Managing the BSS Transmission\ Configuring a newtranscoder\ Configuring an Ater Interface with the MGW
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Three layers of CCS7 signalling
M3UA | MTP
MGW
TCSM
BSC
BSSAP
SCCP
MTP
BSSAP
SCCP
M3UA
MSS
Refer to RG20 Documentation:
Administer\ Common Channel Signalling (MTP, SCCP and TC)
MTP:
Transmits signalling data to a destination. Consists of at least one signalling link, asignalling link set, and a signalling route set.
SCCP:
The SCCP complements the services of the MTP by providing connectionless andconnection-oriented network services.
BSSAP:
Base Station System Application Part consists of BSSMAP (BSS ManagementApplication Part) for messages between the BSC and the MSC, and DTAP (Direct
Transfer Application Part) for messages to and from the mobile station.
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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
YesMTP exists?
Add signalling link to link set
Allow activation of signalling link
Change signalling link state
END
START
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MTP layer
MSS 1
SPC=1234
MGW 1
SPC=1233
BSC
SPC=1223
Signalling Link
Signalling Link Set
Signalling Route Set
MGW 2
SPC=1235
e.g. TS 16
e.g. TS 31
SLC=0
e.g. TS 31
SLC=1
Signalling Link:
A signalling link describes the physical TSL that is used for CCS7 signalling. Thereshould be at least two signalling links between the network elements.
Signalling Link Set:
The signalling link set contains all signalling links between two network elements.The network elements are identified by their own signalling point code (SPC). A linkset can contain up to 16 signalling links. The signalling link code (SLC) is an uniquelink number within the link set that must be equal at both network elements.
Signalling Route Set:
The signalling route set contains the route for a destination SPC with the informationof the next hop called signalling transfer point (STP) . Is also possible to define
alternative routes and to prefer routes. So a route set can be seen as a routing table.
For example: route sets in MGW2
To reach SPC1234 (MSS1) next STP is SPC1234 (MSS1)
or next STP is SPC1233 (MGW1)
To reach SPC1233 (MGW1) next STP is SPC1233 (MGW1)
Between MSS and BSC the configuration is very simple: there is only one route setincluding one link set containing several signalling links.
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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
Create local SCCP and local Subsystem BSSAP (FE)
Create service for CONS (10F) and CLNS (208)
Change local and remote Subsystem state
START
END
Local / Remote
The terms local and remote are often used in context with Applications andProtocols. Creation of local applications means to define witch messages from agiven sender are able to receive. Remote applications define witch messages aresent to a given receiver.
Broadcast status
Local:
BSC MSS
affectedconcerned
ZOBC Remote:
BSC MSS
concernedaffected
ZOBM
Info Info
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Creating speech channels
Add circuits to the circuit group
Change the state of the speech circuits
yes
no
Circuit groupexists?
Create a circuit group
START
END
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Speech circuits
BSC NCGR: MSS01
GSWB
FR
FR
FR
TCSMETPCM-512
TCPCM-1
TCPCM-3
TCPCM-2
CCSPCM-0
CCSPCM-1
CCSPCM-2
ET-512
MGW
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Exercise: A interface integration
BSC
SPC=.............
TCSM...... ET.....
MSC
SPC=.............
CCS7 inTSL16
CCS7 in TSL.......Link set=..............SLC=......Sign. network=........
Codec=CCSPCM=......CGR=........
Exercise:
Create the A interface according to the picture above.
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A Interface using SIGTRAN protocol stack
M3UA
IP
SCTP
Ethernet
M3UA
BSSAP
IP
SCTP
Ethernet
SCCP SCCP
BSSAP
BSC MSC
SIGTRANSIGTRAN
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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 signallingstack
Applicationcan be
ISUP, BICC,SCCP, etc.
SIGTRAN - Signalling over IP
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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 Rel4
M3UA (MTP3 User Adaptation) provides MTP3 user adaptation forupper layers to use
IP
SCTP
SUA
TCAP
MAP
IP
SCTP
M3UA
SCCP
TCAP
MAP
M3UA MTP3 User Adaptation
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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
Addressingbased on
SPCs!
SIGTRAN Terms and Concepts
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SIGTRAN Terms and Concepts
Each association inside an association set can be in the following states:
SCTP-DOWN
UP - PROCEEDING ASP-DOWN
ASP-INACTIVE
ASP-ACTIVE
Note
Association set is related to NSN distributed architecture, and it is a NSN-specific
concept.
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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 )
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