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ITU-T X.70 Terminal and transit control signalling system for start-stop services on international circuits between anisochronous data networks
ITU-T X.71 Decentralized terminal and transit control signalling system on international circuits between synchronous data networks
ITU-T X.80 Interworking of interexchange signalling systems for circuit switched data services
ITU-T X.81 Interworking between an ISDN circuit-switched and a circuit-switched public data network
ITU-T X.82 Detailed arrangements for interworking between CSPDNs and PSPDNs based on recommendation T.70
ITU-T X.92 Hypothetical reference connections for public synchronous data networks
ITU-T X.130 Call processing delays in public data networks when providing international synchronous circuit-switched data services
ITU-T X.131 Call blocking in public data networks when providing international synchronous circuit-switched data services
ITU-T X.141 General principles for the detection and correction of errors in public data networks
ITU-T X.150 Principles of maintenance testing for public data networks using data terminal equipment (DTE) and data circuit-terminating equipment (DCE) test loops
ITU-T X.180 Administrative arrangements for international closed user groups (CUGs)
ITU-T X.181 Administrative arrangements for the provision of international permanent virtual circuits (PVCs)