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ITU X.224:1995

ITU X.224:1995 Information Technology - Open Systems Interconnection - Protocol For Providing The Connection-mode Transport Service Provides a common encoding and a number of classes of transport protocol procedures to be used with different network qualities of service.

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Table of Contents

1Scope
2References
2.1IdenticalRecommendations/InternationalStandards
2.2PairedRecommendations/InternationalStandards
equivalentintechnicalcontent
3Definitions
4Abbreviations
4.1Dataunits
4.2TypesofTransportProtocoldataunits
4.3TPDUfields
4.4Timesandassociatedvariables
4.5Miscellaneous
5OverviewoftheTransportProtocol
5.1ServiceprovidedbytheTransportLayer
5.2ServiceassumedfromtheNetworkLayer
5.3FunctionsoftheTransportLayer
5.4ClassesandoptionswhenoperatingoverCONS
5.5Characteristicsofclass4transportprotocolwhen
operatingoverCLNS
5.6ModeloftheTransportLayer
6Elementsofprocedure
6.1Useofthenetworkservice
6.2TransportProtocolDataUnit(TPDU)transfer
6.3Segmentingandreassembling
6.4Concatenationandseparation
6.5Connectionestablishment
6.6Connectionrefusal
6.7Normalrelease
6.8ErrorreleasewhenoperatingoverCONS
6.9AssociationofTPDUswithtransportconnections
6.10DataTPDUnumbering
6.11Expediteddatatransfer
6.12Reassignmentafterfailurewhenoperatingover
CONS
6.13RetentionandacknowledgementofTPDUs
6.14Resynchronization
6.15Multiplexinganddemultiplexingwhenoperating
overCONS
6.16Explicitflowcontrol
6.17Checksum
6.18Frozenreferences
6.19Retransmissionontime-out
6.20Resequencing
6.21Inactivitycontrol
6.22Treatmentofprotocolerrors
6.23Splittingandrecombiningwhenoperatingover
CONS
7Protocolclasses
8Specificationforclass0-Simpleclass
8.1Functionsofclass0
8.2Proceduresforclass0
9Specificationforclass1-Basicerrorrecoveryclass
10Specificationforclass2-Multiplexingclass
11Specificationforclass3-Errorrecoveryand
multiplexingclass
12Specificationforclass4-Errordetectionandrecovery
class
13StructureandencodingofTPDUs
13.1Validity
13.2Structure
13.3ConnectionRequest(CR)TPDU
13.4ConnectionConfirm(CC)TPDU
13.5DisconnectRequest(DR)TPDU
13.6DisconnectConfirm(DC)TPDU
13.7Data((DT)TPDU
13.8ExpeditedData(ED)TPDU
13.9DataAcknowledgement(EA)TPDU
13.10ExpeditedDataAcknowledgement(EA)TPDU
13.11Reject(RJ)TPDU
13.12TPDUError(ER)TPDU
14Conformance
14.5Claimsofconformanceshallstate
AnnexAStatetables
A.1General
A.2Conventions
A.3Tables
A.4Statetablesforclasses0and2
A.5Statetablesforclasses1and3
A.6Statetablesforclass4overCONS
A.7Statetablesforclass4overCLNS
AnnexBNetworkconnectionmanagementsubprotocol
B.1Introduction
B.2Scope
B.3Definitions
B.4Abbreviations
B.5Overviewoftheprotocol
B.6Elementsofprocedure
B.7Protocoloperation
B.8StructureandencodingofTPDUs
B.9Conformance
B.10Statetable
B.11DiagramforNCMSprotocoloperation
AnnexCPICSProforma
C.1General
C.2Identification
C.3IndicesusedinthisAnnex
C.4BasedRecommendation/InternationalStandard
conformance
C.5Generalstatementofconformance
C.6Protocolimplementation
C.7NCMSfunctions
C.8Initiator/respondercapabilityforprotocol
classes0-4
C.9Supportedfunctions
C.10SupportedTPDUs
C.11SupportedparametersofissuedTPDUs
C.12SupportedparametersforreceivedTPDUs
C.13UserdatainissuedTPDUS
C.14UserdatainreceivedTPDUS
C.15Negotiation
C.16Errorhandling
C.17Timersandprotocolparameters
AnnexDChecksumAlgorithms
D.1Symbols
D.2Arithmeticconventions
D.3Algorithmforgeneratingchecksumparameters
D.4Algorithmforcheckingchecksumparameters
AnnexEStatetablesforoperationofclass4over
connection-modeandconnectionless-mode
networkservices
E.1General
E.2Conventions
E.3Tables
E.4Statetablesforclass4
AppendixIDifferencesbetweenITU-TRec.X.224(1993)
andISO/IEC8073:1992
I.1Assignmenttonetworkconnections
I.2Conformance
I.3Classnegotiation
I.4Precedence
I.5DifferencebetweenITU-TRec.X.224andISO/IEC
8073

Abstract

Provides a common encoding and a number of classes of transport protocol procedures to be used with different network qualities of service.

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