Table of Contents
0Introduction
0.1General
0.2Elements
0.3Basicsystemstructure
1Physicallayer-characteristicsofthesignalling
terminal/physicalcircuitinterface
2Linklayerproceduresbetweensignallingterminals
2.1Scopeandfieldofapplication
2.2Framestructure
2.3Elementsofprocedures
2.4Descriptionoftheprocedures
2.5Multilink
3Packetlayerproceduresbetweensignallingterminals
3.0Generalprinciples
3.1Proceduresforvirtualcallset-upclearing
3.2Proceduresforpermanentvirtualcircuitservice
3.3Proceduresfordataandinterrupttransfer
3.4Proceduresforflowcontrolandreset
3.5Procedureforrestart
3.6Relationshipbetweenlayers
4Packetformatsforvirtualcallsandpermanentvirtual
circuits
4.1General
4.2Callset-upandclearingpackets
4.3Dataandinterruptpackets
4.4flowcontrolandresetpackets
4.5Restartpackets
5Proceduresandformatsforuserfacilitiesandnetwork
utilities
5.1Descriptionofoptionaluserfacilities
5.2Formatsforoptionaluserfacilities
5.3Proceduresfornetworkutilities
5.4Formatsfornetworkutilities
AnnexA-DefinitionofsymbolsforAnnexesB,CandD
A.1General
A.2Symboldefinitionofthestatediagrams
A.3Orderdefinitionofthestatediagrams
A.4Symboldefinitionoftheactiontables
AnnexB-Statediagramsforthepacketlayerinterface
betweenSTEsfornormalcases
AnnexC-ActionstakenbytheSTEonreceiptofpackets
inagivenstateofthepacketlayerX/Yinterface
AnnexD-ActionstakenbytheSTEontime-outinthe
packetlayer
AnnexE-Codingofnetworkgenerateddiagnosticfields
inX.75clear,resetandrestartpackets
AnnexF-Associationoferrorconditionswithcauseand
diagnosticcodes
AppendixI-Examplesofmultilinkresettingprocedures
I.1Introduction
I.2MLPresetinitiatedbyasingleSTE
I.3MLPresetinitiatedbybothSTEssimultaneously
AppendixII-Additionalinformationondata
signallingrateshigherthan64kbit/s
II.1Useoftimeslot0to2Mbit/slinks
II.2Guidelinesfordatasignallingrateshigherthan
64kbit/sinordertosupporthighthroughput
AppendixIII-Guidelinesfortransmissionoverchannels
withlongroundtripdelayand/ortransmission
rateshigherthan64kbit/s
III.1Preamble
III.2Commonguidelines
III.3Guidelinesforchannelswithlongroundtripdelays
operatingat64kbit/s
III.4Guidelinesforcircuitsoperatingat1920kbit/s
AppendixIV-Examplesoftheuseofmulti-selective
rejectoption Abstract
So as to provide a mechanism for the reliable transport of packets between two signalling terminals, it is necessary to define a procedure which can accept and deliver packets to the packet layer when either single or multiple physical circuits are employed. If the effects of circuit failures are not to disrupt the packet layer operation, a multiplicity of physical circuits are required.
