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ITU-T X.217 Information technology - Open Systems Interconnection - Service definition for the Association Control Service Element
ITU-T X.445 Asynchronous protocol specification - Provision of OSI connection mode network service over the telephone network
ITU-T X.37 Encapsulation in X.25 packets of various protocols including frame relay
ITU-T E.174 Routing principles and guidance for universal personal telecommunications (UPT)
ITU-T X.163 Definition of management information for customer network management service for public data networks to be used with the CNMe interface
ITU-T X.115 Definition of address translation capability in public data networks
ITU-T E.743 Traffic measurements for SS No. 7 - Dimensioning and planning
ITU-T X.802 Information technology - Lower layers security model
ITU-T X.295 OSI conformance testing methodology and framework for protocol recommendations for ITU-T applications - Protocol profile test specification
ITU-T X.222 Use of X.25 LAPB compatible data link procedures to provide the OSI connection-mode data link service
ITU-T X.235 Information technology - Open Systems Interconnection - Connectionless Session protocol: Protocol specification
ITU-T X.245 Information technology - Open Systems Interconnection - Connection-oriented Session protocol: Protocol Implementation Conformance Statement (PICS) proforma