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Rev A 2003-12-18 1
Chapter 8Signaling in AXE
AXE Hardware Maintenance, LZU 108 6131
Rev A 2003-12-18 2
Objectives
After this chapter you will be able to:– Distinguish between access and interexchange signaling– Describe the characteristics of subscriber line signaling– Mention the differences between CAS and CCS– Describe channel associated signaling in a signaling diagram– Describe common channel signaling in a signaling diagram– Describe the structure of CCS– Be able to configure the SS7 signaling in AXE
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Introduction
Signaling systems and implementation
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Main purpose of signaling
• set-up, supervise and release telecommunication connections and services
• query data bases e.g. specific services, roaming in cellular networks, etc.
• support network management procedures
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Signaling in a telecom network
Access signaling Trunk signaling
Signaling
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Signaling Systems
System No. 7
Access signaling(Subscriber-Exchange)
Trunk signaling(Between exchanges)
ChannelAssociatedSignaling(CAS)
System No. 6
CommonChannelSignaling(CCS)
System R1
System No. 5
System R2
Subscriber LineSignaling• Decadic• DTMF• AC/DC/Tones
Digital SubscriberSignaling System No. 1 (DSS1)
Signaling methods
Signaling systems
Signaling type
PSTN
ISDN
PLMNPSTNPSTN
ISDN
PLMN
Digital Analogue
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Access Signaling
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Access Signaling Concepts
• Analogue - PSTN• Digital - ISDN• RSS - Remote Subscriber Switch• ENGINE Access Ramp
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Subscriber line signaling in PSTN
A
B
A
On hook
Call communication: Speech/Data/Fax
On hook
Off hook/Seizure
Off hook/B-answer
Dial tone
Ringing tone
Alternatives:Busy tone
Congestion tone
Ringing signal
B-number
B
B
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D-channel signaling for a call in ISDNA B
Call communication: Speech/Data/Fax
SS7-signalingD-channelsignaling
D-channelsignaling
Setup
Disconnect
Setup
Disconnect
Call proceeding
Trunk network
Connect
Release
Connect
Connectacknowledgement
Releasecompletion
Connectacknowledgement
AlertAlert
Release
Releasecompletion
ISDNISDN
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Channel Associated Signaling
CAS
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Channel Associated Signaling Concepts
• Line signaling• Register signaling• R2 MFC Multifrequency Compelled
ChannelAssociatedSignaling(CAS)
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Example of Channel Associated Signaling ChannelAssociatedSignaling(CAS)
A
B
B
A
On hook
Call communication: Speech/Data/Fax
On hook
Off hook
Access signaling Inter-exchange signaling Access signaling
Seizure
Clear forward
Line signal
Line signal
B-number Register signal
Register signal
Line signal
Line signal
Line signal
B-number
Off hook
Dial tone
B-status
B-answer
Clear backward
Release guard
Ringing tone Ringing signal
B-number
B
A
B
B
A
On hook
Call communication: Speech/Data/Fax
On hook
Off hook
Access signaling Inter-exchange signaling Access signaling
Seizure
Clear forward
Line signal
Line signal
B-number Register signal
Register signal
Line signal
Line signal
Line signal
B-number
Off hook
Dial tone
B-status
B-answer
Clear backward
Release guard
Ringing tone Ringing signal
B-number
B
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Channel associated signaling E1 frame
Register signalsin traffic channels
Frame alignment Line signals
0 1 15 16 17 31
Register signalsin traffic channels
ChannelAssociatedSignaling(CAS)
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The multiframe structureChannelAssociatedSignaling(CAS)
Channel: 0 16
0000
TS1 TS17
TS3 TS18
TS15 TS31
Frame 0
Frame 1
Frame 2
Frame 15
MULTIFRAME
125 µs
31
8 bits
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Hardware for the MFC signaling link
CSR
ETC
GSCSR
ETC
GS
MFC signaling link
ChannelAssociatedSignaling(CAS)
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Common Channel Signaling
CCS
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Differentiation of Speech and Signaling
Signaling
SpeechSpeech
Signaling
CommonChannelSignaling(CCS)
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SS7 main features
• Speed• High capacity• Better economy• Reliability• Flexibility
CommonChannelSignaling(CCS)
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Common ChannelSignaling System No. 7
Example of Users of SS7 signaling
PLMNMAP
PSTNTUP
ISDNISUP
ININAP
MAP Mobile telephony Application PartINAP Intelligent Network Application PartTUP: Telephony User PartISUP ISDN User Part
CommonChannelSignaling(CCS)
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Concepts in CCS
• SS7, SS7, No.7, #7• SS7 often used for national networks• C6 often used for international networks• Signaling link• Signaling link set• Signaling point• Signaling transfer point• Network indicator• Originating/Destination point code
CommonChannelSignaling(CCS)
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Structure of SS7
Message Transfer PartMTP
User PartUP
CommonChannelSignaling(CCS)
OSI Level 1-3Implemented in CCS Responsibility:Routes the information in the network Provides error control between adjacent nodes Connects the entity to the transmission media
OSI Level 4Implemented in TSS Responsibility:Provides end to end communication control
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Analogy of the Mailing organizationCommonChannelSignaling(CCS)
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Message transfer part hardware
ST
ETC
GSST
ETC
GS
SS7 signaling link
Packet
MTP software
CommonChannelSignaling(CCS)
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SS7 Functional LevelsCommonChannelSignaling(CCS)
Signaling Link FunctionsSignaling NetworkFunctions
Message Transfer Part
ISUP
TUP
xUP
Level 4 Level 3 Level 2 Level 1
Signaling Network
Management
Signaling MessageHandling
Signaling Link
Functions
Signaling DataLink
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C7DR2 functionalitiesCommonChannelSignaling(CCS)
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Other important SS7 blocks
• C7ST, signalling terminal• C7DP2, destination point management • C7LS2, link set management• C7SL2, signalling link management
CommonChannelSignaling(CCS)
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Main terms used in SS7
SPSPSPSP
LSLSSL
LS, SL
SP Signaling PointSTP Signaling Transfer PointOWNSP Own Signaling Point value
SignalingSpeech
CommonChannelSignaling(CCS)
STPSTP
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Signaling points
SP=2SP=2--100100
SP=2SP=2--110110
SP=2SP=2--120120
CommonChannelSignaling(CCS)
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Signaling point codes in a network
STP=2STP=2--1010
SP=2SP=2--100100
SP=2SP=2--110110
SP=2SP=2--120120
STP=2STP=2--2020
Network indicator
Signaling point code
CommonChannelSignaling(CCS)
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Signaling links and link sets
STP=2STP=2--1010
SP=2SP=2--100100
SP=2SP=2--110110
SP=2SP=2--120120
STP=2STP=2--2020
Link Set(LS)
SignalingLink (SL)
CommonChannelSignaling(CCS)
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Hardware for SS7 signaling link
ST
ETC
GSST
ETC
GS
SS7 signaling link
Packet
Semipermanent link
CommonChannelSignaling(CCS)
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Originating destination point codes
signaling link
Speech channel
AB
OPC CIC DPC
STP
SP SP
CommonChannelSignaling(CCS)
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Signaling route
AB
OPC DPC
Signaling route
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An Example of ISUP SignalingCommonChannelSignaling(CCS)
A
B
B
BA
On hook
Call communication: Speech/Data/Fax
On hook
Off hook
signaling point signaling point
Off hook
Dial tone
IAM
SAMACM
ANC
CLF
RLG
Ringing tone Ringing signal
B-numberdigit 1digit 2
digit 4digit 3
digit 5
A
B
B
BA
On hook
Call communication: Speech/Data/Fax
On hook
Off hook
signaling point signaling point
Off hook
Dial tone
IAM
SAMACM
ANM
REL
RLC
Ringing tone Ringing signal
B-numberdigit 1digit 2
digit 4digit 3
digit 5
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CCITT7, Signalling Point, Define
• C7OPI:OWNSP=ownsp;
• C7PNC:OWNSP=ownsp,SPID=spid;
• C7SPI:SP=sp;
• C7PNC:SP=sp,SPID=spid;
• C7SPP:SP=ALL;
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Printout of defined SPs
<c7spp:sp=all;CCITT7 SIGNALLING POINT DATA
SP SPID2-50 OWNSP TOWN12-10 TOWN22-11 TOWN32-51 TOWN4
END
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CCITT7 Multiple Point Code, Routing, Change
• C7LDI:LS=ls;• C7SUC:LS=ls,LVA=lva,ACL=acl,DMI=dmi;• C7LDP:LS=all;
• C7RSI:DEST=dest,PRIO=prio,LS=ls;• C7RUC:DEST=dest,ACL=acl,DMI=dmi;• C7RSP:DEST=all;
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Printout of link set data
<c7ldp:ls=2-10;CCITT7 LINK SET DATA
LS SPID ASP SPID2-10
SLC ACL PARMG ST SDL SLI0 A2 0 C7ST24-0
END
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Printout of routing data
<c7rsp:dest=all;CCITT7 MTP ROUTING DATA
DEST SPID DST PRIO LSHB LS SPID RST2-10 INA 1 2-10 UN/TA
2-11 INA 1 2-11 UN/TA
2-51 CCF1 ACC 1 2-51 CCF1 WO
END
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Semipermanent connection, reserve/activate
• BLODI:DEV=C7ST24-0;BLODI:DEV=UPDN3-16;
• EXSPI:NAME=name;
• EXSSI:DEV1=C7ST24-0;EXSSI:DEV2=UPDN3-16;
• EXSPE;
• EXSCI:NAME=name,DEV=UPDN3-24;
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Printout of semipermanent connection data<exscp:name=loop-1;
SEMIPERMANENT CONNECTION DATA
NAME CSTATE DISTC MISC NUMCHLOOP-1 ACT 12 1
SIDE1 SSTATE ATT ES MISCSDEV=UPDN3-16 ACT
SIDE2 SSTATE ATT ES MISCSDEV=C7ST24-0 ACT
END
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CCITT7 Signalling Terminal, DefineCCITT7 Signalling Link, Define
• C7STI:ST=st,ITYPE=itype;
• C7SLI:LS=ls,SLC=slc,ST=st;
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CCITT7 Message Routing, Activate
• C7LAI:LS=ls,SLC=slc;
• C7SUI:LS=ls;
• C7RAI:DEST=dest;
• C7RUI:DEST=dest;
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Link set state printout
<c7ltp:ls=2-10;
CCITT7 LINK SET STATE
LS SPID SLC STATE INHIBST FCODE INFO2-10 LPNATA 01 ACTIVE
END