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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.245 Information technology - Open Systems Interconnection - Connection-oriented Session protocol: Protocol Implementation Conformance Statement (PICS) proforma
ITU-T X.255 Information technology - Open Systems Interconnection - Connectionless Session protocol: Protocol Implementation Conformance Statement (PICS) proforma
ITU-T X.256 Information technology - Open Systems Interconnection - Connectionless Presentation protocol: Protocol Implementation Conformance Statement (PICS) proforma
ITU-T X.236 Information technology - Open Systems Interconnection - Connectionless Presentation protocol: Protocol specification
ITU-T X.736 AMD 1 Implementation Conformance Statement proformas
ITU-T X.237 Information technology - Open Systems Interconnection - Connectionless protocol for the Association Control Service Element: Protocol specification
ITU-T X.733 AMD 1 Implementation Conformance Statement proformas
ITU-T X.734 AMD 1 Implementation Conformance Statement proformas
ITU-T X.735 AMD 1 Implementation Conformance Statement proformas
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