Table of Contents
1General
1.1Introduction
1.2References
1.3Definitions
1.4Abbreviationsandacronymsusedinthis
Recommendation
2Framestructureforpeer-to-peercommunication
2.1General
2.2Flagsequence
2.3Addressfield
2.4Controlfield
2.5Informationfield
2.6Transparency
2.7FrameCheckSequence(FCS)field
2.8Formatconvention
2.9Invalidframes
2.10Frameabort
3Elementsofproceduresandformatsoffieldsfordata
linklayerpeer-to-peercommunication
3.1General
3.2Addressfieldformat
3.3Addressfieldvariables
3.4Controlfieldformats
3.5Controlfieldparametersandassociatedstate
variables
3.6Frametypes
4Elementsforlayer-to-layercommunication
4.1General
4.2Primitiveprocedures
4.3Blockinteractiondiagramofthedatalinklayer
5ProcedurefortheuseoftheP/Fbit
5.1TerminalEndpointIdentifier(TEI)management
procedures
5.2Proceduresforunacknowledgedinformationtransfer
5.3TerminalEndpointIdentifier(TEI)management
procedures
5.4Initializationofdatalinklayerparameters
5.5Proceduresforestablishmentandreleaseof
multipleframeoperation
5.6Proceduresforinformationtransferinmultiple
frameoperation
5.7Re-establishmentofmultipleframeoperation
5.8Exceptionconditionreportingandrecovery
5.9Listofsystemparameters
5.10Datalinklayermonitorfunction
AnnexAProvisionofpoint-to-pointsignallingconnections
AnnexBSDLforpoint-to-pointprocedures
B.1General
B.2Anoverviewofthestatesofthepoint-to-point
datalinklayerentity
B.3Covernotes
B.4Theuseofqueues
B.5SDLrepresentation
AnnexCSDLrepresentationofthebroadcastprocedures
AnnexDStatetransitiontableofthepoint-to-point
proceduresofthedatalinklayer
D.2Keytothestatetransitiontable
AnnexEProvisionofMulti-SelectiveRejectOption
E.1General
E.2Framestructureforpeer-to-peercommunication
E.3Elementsofproceduresandformatsoffieldsfor
datalinklayerpeer-to-peercommunication
E.4Elementsforlayer-to-layercommunication
E.5Definitionofthepeer-to-peerproceduresof
thedatalinklayer
E.6SDLforpoint-to-pointprocedures
E.7StateTransitionTables
E.8Examplesoftheuseofmulti-selectivereject
option
AnnexFProtocolImplementationConformanceStatement
(PICS)toRecommendationQ.921forBasicRate
(User-side)
F.1General
F.2Abbreviationsandspecialsymbols
F.3InstructionsforcompletingforPICSProforma
F.4Globalstatementofconformance
F.5ProtocolCapabilities(PC)
F.6Frames-ProtocolDataUnits(FR)
F.7SystemParameters(SP)
AnnexGProtocolImplementationConformanceStatement
(PICS)toRecommendationQ.921forBasicRate
(Network-side)
G.1General
G.2Abbreviationsandspecialsymbols
G.3InstructionsforcompletingforPICSProforma
G.4Globalstatementofconformance
G.5ProtocolCapabilities(PC)
G.6Frames-ProtocolDataUnits(FR)
G.7SystemParameters(SP)
AnnexHProtocolImplementationConformanceStatement
(PICS)toRecommendationQ.921forPrimaryRate
(User-side)
H.1General
H.2Abbreviationsandspecialsymbols
H.3InstructionsforcompletingforPICSProforma
H.4Globalstatementofconformance
H.5ProtocolCapabilities(PC)
H.6Frames-ProtocolDataUnits(FR)
H.7SystemParameters(SP)
AnnexIProtocolImplementationConformanceStatement
(PICS)toRecommendationQ.921forPrimaryRate
(Network-side)
I.1General
I.2Abbreviationsandspecialsymbols
I.3InstructionsforcompletingforPICSProforma
I.4Globalstatementofconformance
I.5ProtocolCapabilities(PC)
I.6Frames-ProtocolDataUnits(FR)
I.7SystemParameters(SP)
AppendixIRetransmissionofREJresponseframes
I.1Introduction
I.2Procedure
I.2.1RecoverystatevariableV(M)
I.2.2N(S)sequenceerrorsupplementary
procedure
AppendixIIOccurrenceofMDL-ERRORindicationwithinthe
basicstatesandactionstobetakenbythe
managemententity
II.1Introduction
II.2LayoutofTableII.1
II.3Preferredmanagementactions
AppendixIIIOptionalbasicaccessdeactivationprocedures
III.1Introduction
III.2DescriptionoftheConceptualModel
III.3DeactivationprocedurewithMPH-DEACTIVATE
indication
III.4DeactivationprocedurewithoutMPH-DEACTIVATE
indication
AppendixIVAutomaticnegotiationofdatalinklayer
parameters
IV.1General
IV.2Automaticnegotiationofdatalinklayer
parametervalues Abstract
Defines the Link Access Procedures on the D-channel (LAPD) of an ISDN customer access. Implementations of this Recommendation are being used in existing networks.
