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信令系统及七号信令介绍. 信令的基本概念和分类 No.7 信令系统概述 消息传递部分 ( MTP ) 电话用户部分( TUP ) 信令连接控制部分( SCCP ) 事务处理能力( TCAP ). 1.1 信令的基本概念和分类 通信协议的基本内容有: ① 规定在收发双方之间相互交换信息的表现形式; ② 为正确无误地将信息传送到对方所规定的控制规程。. 图 1-1 所示的是市话网中两分局用户电话接续时信令传送的示例。. 图 1-1 市话网中两分局用户接续示例. 1.2 信令的分类 1 .按信令的传送区域划分

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信令系统及七号信令介绍

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No.7

MTP

TUP

SCCP

TCAP


1.1


1-1

1-1


1.2

1


2

,,


3


4


1.2

1.2.1

1

2


1.2.2

1

2


2No.7

No.7


1.4.2 No.7


1No.7

No.7No.7Message Transfer PartMTPUser PartUP


1-7 No.7


OSI

OSI

OSI


2OSINo.7

1

MTP

2

TUPNo.7

3


4

TC

5

ISDNISUPTUP

6

7


  • FISU

  • LSSU

  • MSU


MSU:

MSUMSU272

F

CK

SIF

SIO

LI

FIB

FSN

BIB

BSN

F

The first transmitted bit

MSU

LI>2


LSSU:

LSSULSSULSSUSF

F

CK

SF

LI

FIB

FSN

BIB

BSN

F

LSSU

Note: SF---- Status Field

The first transmitted bit

LI1~2


FISU:

FISU

F

CK

LI

FIB

FSN

BIB

BSN

F

The first transmitted bit


  • (F):

    • 01111110.

  • FISU


(FSN, BSN):

(FSN)

(BSN)

(FIB, BIB):

FSN BSN, (FIB) (BIB) , 1,


(LI):

LI0 byte: (FISU)

LI1 byte or 2: (LSSU)

LI>2 byte: (MSU)


SIO

DCBA

DCBA

Sub-service

field

Service

indication

code

F

CK

SSF SI

SIF

SIO

LI

FIB

FSN

BIB

BSN

F

8 16 8n(n2) 8 2 6 1 7 1 7 8

The first transmitted bit


1.4.4 No.7

1

No.7SPSTP

1SP

2STP

3


2

1

2

3No.7

No.7HSTPLSTPSP


2-13 No.7


4

5

1

14


2-14


2

24

1-15


1.5

1.5.1

1-16

1-17


1-16


1-17


1.5.2

1

2

No.7CRC


3

No.715ms

1

2


1-18


4

5

6

7


2.5.3

No.7

1

1

2

3

3

2


1-19

1-19


2.6

1

2-20

2-20


1

DPCOPCCIC32-21

2-21


2

H0Hl

3

2

IAM


2.6.2

1

1

2SAMSAO

3

4GRQGSM

5


6

7

8

9

10

11


2

1

2

2.6.3

1

1

2

3

4119110120


ISUP




2-26 119110120


3

1

2

1

2


1.7

1.7.1 SCCP

1SCCP

SSPSCP

MSCVLRHLR

ISDN


MTP

SI416


  • 2SCCP

  • SCCP

  • No.7


1.7.2 SCCP

1

1

SCCPSub System NumberSSNSCCP

2

SCCPGlobal TitleGTSPCSSN


2

SCCP4

1

0SCCPSLS

1SCCP


2

2

3


2.7.3 SCCP2-41 SCCP


1

DPCOPCSLSMTP3

2


3

F

4

V

5

O


1.7.4 SCCP

1SCCP

SCCPSCCPSCCP42-42


2SCCP

SCCPSPCSSNGT

SPCMTPMTPDPCSIMTP

SSNSCCP

GT


SCCPSCCP2-43

2-43 SCCP


2-44

2-44


  • GT0100GT2-45

2-45 GT=0100


2.7.5

1

UDTXUDT

1

2-46 UDT


2

3XUDT

4

2-47 XUDT


2

2-48

1UDT1

2UDT2


1.8

Transaction CapabilitiesTCTCAPTC-

1

TC2-49


a. Component SublayerCSLAPDU

b.Transaction SublayerTSLTC-

2-49 TC


  • 2

  • 1

  • 5

  • InvokeINV

  • -Return Result Not LastRR-NL

  • -Return Result LastRR-L

  • Return ErrorRE

  • RejectRJ


2

3

4TC-

ID ID ID

ID

P-ABORT


5

3

1TR-

TR-

ID P-Abort

TCTR2-16


TC-

TR-

TC-UNI

TC-UNI

TC-Begin

TR-Begin

TC-Continue

TR-Continue

TC-End

TR-End

TC-U-Abort

TR-U-Abort

TC-P-Abort

TC-P-Abort

2-16 TCTR


2

Begin

  • Continue

  • End

  • Abort


1.8.3

TCSCCP

  • 2-50 TCMSUSCCP

TC


1

TCInformation Element

2-51


2-52

2-52


1

Tag Class

Element Form

Tag Code

2-53


2

  • 2-54


2TC

2-55 TC


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