Table of Contents
1Introduction
1.1Generalcharacteristicsofthesignalling
networkfunctions
1.2Signallingmessagehandling
1.3Signallingnetworkmanagement
2Signallingmessagehandling
2.1General
2.2Routinglabel
2.3Messageroutingfunction
2.3.4Handlingoflevel3messages
2.3.5Handlingofmessagesundersignalling
linkcongestion
2.4Messagediscriminationanddistributionfunctions
3Signallingnetworkmanagement
3.1General
3.2Statusofsignallinglinks
3.2.2Signallinglinkfailure
3.2.3Signallinglinkrestoration
3.2.4Signallinglinkdeactivation
3.2.5Signallinglinkactivation
3.2.6Signallinglinkblocking
3.2.7Signallinglinkunblocking
3.2.8Signallinglinkinhibiting
3.2.9Signallinglinkuninhibiting
3.3Proceduresusedinconnectionwithlinkstatus
3.3.1Signallinglinkfailed
3.3.2Signallinglinkrestored
3.3.3Signallinglinkdeactivated
3.3.4Signallinglinkactivated
3.3.5Signallinglinkblocked
3.3.6Signallinglinkunblocked
3.3.7Signallinglinkinhibited
3.3.8Signallinglinkuninhibited
3.4Statusofsignallingroutes
3.4.1Signallingrouteunavailability
3.4.2Signallingrouteavailability
3.4.3Signallingrouterestricted
3.5Proceduresusedinconnectionwithroutestatus
changes
3.5.1Signallingrouteunavailable
3.5.2Signallingrouteavailable
3.5.3Signallingrouterestricted
3.6Statusofsignallingpoints
3.6.1Signallingpointunavailability
3.6.2Signallingpointavailability
3.7Proceduresusedinconnectionwithpoint
3.7.1Signallingpointunavailable
3.7.2Signallingpointavailable
3.8Signallingnetworkcongestion
3.8.1General
3.8.2Congestionstatusofsignallinglinks
3.8.3Proceduresusedinconnectionwith
linkcongestionstatuschanges
3.8.4Congestionstatusofsignallingroute
sets
3.8.5Proceduresusedinconnectionwith
routesetcongestionstatuschanges
4Signallingtrafficmanagement
4.1General
4.2Normalroutingsituation
4.3Signallinglinkunavailability
4.4Signallinglinkavailability
4.5Signallingrouteunavailability
4.6Signallingrouteavailability
4.7Signallingrouterestriction
4.8Signallingpointavailability
5Changeover
5.1General
5.2Networkconfigurationsforchangeover
5.3Changeoverinitiationandactions
5.4Bufferupdatingprocedure
5.5Retrievalanddiversionoftraffic
5.6Emergencychangeoverprocedures
5.7Proceduresinabnormalconditions
6Changeback
6.1General
6.2Changebackinitiationandactions
6.3Sequencecontrolprocedure
6.4Time-controlleddiversionprocedure
6.5Proceduresinabnormalconditions
7Forcedrerouting
7.1General
7.2Forcedreroutinginitiationandactions
8Controlledrerouting
8.1General
8.2Controlledreroutinginitiationandactions
9MTPrestart
9.1General
9.2ActionsinasignallingpointwhoseMTP
isrestarting
9.3ActionsinasignallingpointX,adjacenttoa
signallingpointYwhoseMTPrestarts
9.4Shorttermisolations
9.5TRAmessagesandtimerT19
9.6Generalrules
9.7Sequencediagrams
9.7.1SPwithrestartingMTPaccordingto
subclause9.2
9.7.2ActionsinSPXadjacenttoSPYwhose
MTPrestartsaccordingtosubclause9.3
10Managementinhibiting
10.1General
10.2Inhibitinginitiationandactions
10.3Uninhibitinginitiationandactions
10.3.1Management-initiateduninhibiting
10.3.2Signallingroutingcontrolinitiated
uninhibiting
10.4Receiptofunexpectedmanagementinhibition
messages
10.5Managementinhibitedlinkstatusandprocessor
recovery
10.6Inhibittestprocedure
11Signallingtrafficflowcontrol
11.1General
11.2Flowcontrolindications
11.2.1Signallingroutesetunavailability
11.2.2Signallingroutesetavailability
11.2.3Signallingroutesetcongestion
(Internationalsignallingnetwork)
11.2.4Signallingroutesetcongestion
(Nationaloptionwithcongestion
priorities)
11.2.5Signallingroutesetcongestion
(Nationaloptionswithoutcongestion
priorities
11.2.6Signallingpoint/signallingtransfer
pointcongestion
11.2.7UserPartavailabilitycontrol
11.2.8UserPartcongestion
12Signallinglinkmanagement
12.1General
12.2Basicsignallinglinkmanagementprocedures
12.2.1Signallinglinkactivation
12.2.2Signallinglinkrestoration
12.2.312Signallinglinkmanagement
12.2.4Linksetactivation
12.3Signallinglinkmanagementproceduresbasedon
automaticallocationofsignallingterminals
12.3.1Signallinglinkactivation
12.3.2Signallinglinkrestoration
12.3.3Signallinglinkdeactivation
12.3.4Linksetactivation
12.4Signallinglinkmanagementproceduresbased
onautomaticallocationofsignallingdatalinks
andsignallingterminals
12.5Automaticallocationofsignallingterminals
12.6Automaticallocationofsignallingdatalinks
12.7Differentsignallinglinkmanagementprocedures
atthetwoendsofalinkset
13Signallingroutemanagement
13.1General
13.2Transfer-prohibited
13.3Transfer-allowed
13.4Transfer-restricted(Nationaloption)
13.5Signalling-route-set-test
13.6Transfer-controlled(Internationalnetwork)
13.7Transfer-controlled(Nationaloptionwith
congestionpriorities)
13.8Transfer-controlled(Nationaloptionwithout
congestionpriorities)
13.9Signalling-route-set-congestion-test
(NationalOption)
14Commoncharacteristicsofmessagesignalunitformats
14.1General
14.2Serviceinformationoctet
14.3Label
15Formatsandcodesofsignallingnetworkmanagement
messages
15.1General
15.2Label
15.3Headingcode(HO)
15.4Changeovermessage
15.5Changebackmessage
15.6Emergencychangeovermessage
15.7Transfer-prohibitedmessage
15.8Transfer-allowedmessage
15.9Transfer-restrictedmessage(nationaloption)
15.10Signalling-route-set-testmessage
15.11Managementinhibitmessage
15.12Trafficrestartallowedmessage
15.13Signalling-data-link-connection-ordermessage
15.14Signalling-data-link-connection-acknowledgement
message
15.15Transfer-controlledmessage
15.16Signalling-route-set-congestion-testmessage
(nationaloption)
15.17UserPartunavailablemessage
16Statetransitiondiagrams,abbreviationsandtimers
16.1General
16.2Draftingconventions
16.3Signallingmessagehandling
16.4Signallingtrafficmanagement
16.5Signallinglinkmanagement
16.6Signallingroutemanagement
16.7AbbreviationsusedinFigures23onwards
16.8Timersandtimervalues Abstract
Covers the functions and methods for and in relation to the transferring of messages between the signalling points, which are the signalling network nodes. This has been modified to permit use by the broadband ISDN User Part in the narrow-band environment, and the Satellite ISDN User Part.
