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ITU X.445:1995

ITU X.445:1995 Message Handling Systems - Asynchronous Protocol Specification - Provision Of Osi Connection Mode Network Service Over The Telephone Network Applicable in MHS environments requiring optimization of data link and network layer protocols for reliable asynchronous communication over the telephone network.

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Table of Contents

1Scope
2References
3Definitions
3.1Referencemodeldefinitions
3.2Serviceconventionsdefinitions
3.3Networkservicedefinitions
3.4X.25definitions
3.5APSdefinitions
4Abbreviations
4.1Referencemodelabbreviations
4.2Networklayerabbreviations
4.3X.25abbreviations
4.4Datalinklayerabbreviations
4.5Otherabbreviations
5Overview
5.1Configurations
5.2ModelsofoperationandtheirAPSlayers
representation
5.2.1V.42-dependentmode
5.2.2LAPBmode
5.2.3X.25mode
5.2.4Modenegotiations
5.2.5Modesupport
6ProvisionoftheOSICONS
6.1Controlofunderlyingconnections
6.2MappingOSICONSto/fromX.25PLP
6.3MappingOSICONSto/fromtheAPSnetwork
protocol
7APSlayer2protocols
7.1Introduction
7.2Start/stopLAPB
7.3APSdatalinkprotocol
7.3.1Receptionofincorrectframes
7.4Transparency
7.5APSlayer2operationandestablishmentofthe
underlyingconnection
7.5.1Point-to-Pointconfiguration
7.5.1.1Establishmentoftheunderlying
connection
7.5.1.2Datalinkset-up
7.5.1.3LAPBaddressing
7.5.1.4Timefill
7.5.2PADconfiguration
7.5.2.1Establishmentoftheunderlying
connection
7.5.2.2Datalinkset-up
7.5.2.3LAPBaddressing
7.5.2.4Timefill
7.5.2.5MappingofAPSlayer2framestopackets
7.5.2.6Exceptionconditions
7.5.3Directnetworkconfiguration
7.5.3.1Establishmentoftheunderlying
connection
7.5.3.2LAPBdatalinkset-up
7.5.3.3LAPBaddressing
7.5.3.4Timefill
8APSlayer3protocols
8.1TheAPSnetworkprotocol
8.1.1APSnetworkprotocolelementsofprocedure
8.1.1.1Connectionestablishmentprocedure
8.1.1.2Datatransferprocedure
8.1.1.3Disconnectprocedure
8.1.2APSnetworkprotocolstructure
8.1.2.1TheconnectrequestPDU
8.1.2.2TheconnectconfirmPDU
8.1.2.3ThedatatransferPDU
8.1.2.4ThedisconnectrequestPDU
8.1.2.5ThedisconnectconfirmPDU
8.1.2.6MaximumuserdatainAPSNPDUs
8.2X.25PLPoperation
8.2.1Optionalandnegotiableparameters
8.2.1.1ParameterusageintheDirectNetwork
configuration
AnnexA-Transparency
A.0Transparency
A.1Introduction
A.2APSPADtransparency
AnnexB-APSprotocolsselectionstring
B.0APSprotocolsselectionstring
B.1Introduction
B.2APSprotocolsselectionstringformat
B.3UseofthecalluserdatainX.25callrequests
AnnexC-UseoftheAPSnetworkprotocoltoprovidethe
OSIconnection-modenetworkservice
C.0UseoftheAPSnetworkprotocoltoprovidethe
OSIconnection-modenetworkservice
C.1Introduction
C.2Networkconnectionestablishmentphase
C.3Datatransferphase
C.3.1HandlingofNS-user-data
C.3.2Theresetservice
C.4Networkconnectionreleasephase
C.4.1MappingofN-DISCONNECTParameters
AnnexD-RecommendedpracticeforuseinMHSenvironment
D.0Recommendedpractices
D.1APSlayer3protocols
D.1.1UseoftheAPSnetworkprotocolforsimultaneous
communications
D.1.2Handlingoffutureversions
D.2APSlayer2protocols
D.2.1LAPBretransmissiontimer
D.3Start/stopframing
D.3.1FastFrameControlCheck(FCS)implementation
D.4Modems
D.4.1V.42modems
D.4.2Modemswithautomaticdatarateswitching
D.4.3Modemflowcontrol
D.5PADoperation
D.5.1RecommendedPADparameters
D.5.2RemotePADparameters
D.6Timersandcounters
D.6.1APSlayer2
D.6.2APSlayer3

Abstract

Applicable in MHS environments requiring optimization of data link and network layer protocols for reliable asynchronous communication over the telephone network.

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