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ITU-T X.320 General arrangements for interworking between Integrated Services Digital Networks (ISDNs) for the provision of data transmission services
ITU-T V.38 A 48/56/64 kbit/s data circuit-terminating equipment standardized for use on digital point-to-point leased circuits
ITU-T X.75 Packet-switched signalling system between public networks providing data transmission services
ITU-T X.160 Architecture for customer network management service for public data networks
ITU-T X.301 Description of the general arrangements for call control within a subnetwork and between subnetworks for the provision of data transmission services
ITU-T X.321 General arrangements for interworking between Circuit-Switched Public Data Networks (CSPDNs) and Integrated Service Digital Networks (ISDNs) for the provision of data transmission services
ITU-T X.325 General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services
ITU-T T.52 AMD 1 T.52 (1993) Amendment 1
ITU-T X.300 General principles for interworking between public networks and between public networks and other networks for the provision of data transmission services
ITU-T F.59 General characteristics of the international telex service
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