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ITU-T X.20 Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for start-stop transmission services on public data networks
ITU-T X.20bis Use on public data networks of data terminal equipment (DTE) which is designed for interfacing to asynchronous duplex V-series modems
ITU-T X.21bis Use on public data networks of data terminal equipment (DTE) which is designed for interfacing to synchronous V-series modems
ITU-T X.24 List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) on public data networks
ITU-T X.302 Description of the general arrangements for internal network utilities within a subnetwork and intermediate utilities between subnetworks for the provision of data transmission services
ITU-T X.305 Functionalities of subnetworks relating to the support of the OSI connection-mode network service
ITU-T X.322 General arrangements for interworking between packet switched public data networks (PSPDNs) and circuit switched public data networks (CSPDNs) for the provision of data transmission services
ITU-T X.323 General arrangements for interworking between packet switched public data networks (PSPDNs)