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ITU-T X.200 Information technology - Open Systems Interconnection - Basic Reference Model: The basic model
ITU-T X.216 Information technology - Open Systems Interconnection - Presentation service definition
ITU-T X.226 Information technology - Open Systems Interconnection - Connection-oriented Presentation protocol: Protocol specification
ITU-T Q.2100 B-ISDN signalling ATM adaptation layer (SAAL) - Overview description
ITU-T X.234 Information technology - Protocol for providing the OSI connectionless-mode transport service
ITU-T X.273 Information technology - Open Systems Interconnection - Network layer security protocol
ITU-T X.274 Information technology - Telecommunication and information exchange between systems - Transport layer security protocol
ITU-T X.622 Information technology - Protocol for providing the connectionless-mode Network service: Provision of the underlying service by an X.25 Subnetwork
ITU-T X.623 Information technology - Protocol for providing the connectionless-mode Network service: Provision of the underlying service by a subnetwork that provides the OSI Data Link service
ITU-T X.8 Multi-aspect PAD (MAP) framework and service definition
ITU-T X.863 Information technology - Open Systems Interconnection - Distributed Transaction Processing: Protocol Implementation Conformance Statement (PICS) proforma
ITU-T X.880 Information technology - Remote Operations: Concepts, model and notation