译：GB/T 17904.1-1999 ISDN user-network interface data link layer specification and conformance testing method—Part 1:User-network interface data link layer specification

译：GB/T 17904.2-1999 ISDN user-network interface data link layer specification and conformance testing method—Part 2:Data link layer protocol conformance testing method

译：GB/T 11595-1999 Interface between data terminal equipment(DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit

译：GB/T 11597-1999 Procedure for the exchange of control information and user data between a packet assembly/disassembly (PAD) facility and a packet mode DTE or another PAD

译：GB/T 17801-1999 Interface between data terminal equipment(DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and accessing a packet switched public data network through a public switched telephone network or an integrated services digital network or a circuit switched public data network

译：GB/T 11589-1999 International user classes of service in, and categories of access to, public data networks and integrated services digital networks(ISDNs)

译：GB/T 11590-1999 International data transmission services and optional user facilities in public data networks and ISDNs

译：GB/T 17789-1999 Procedures for simultaneous transmission of data and digitally encoded voice signals over the PSTN or over 2-wire leased point-to-point telephone type circuits

译：GB/T 17153-1997 General principles for interworking between public networks,and between public networks and other networks for the provision of data transmission services

译：GB/T 16654-1996 Technical requirements for ISDN(2B+D)NT1 user-network interface equipment

译：GB/T 16520-1996 Message handling Electronic data interchange messaging service

译：GB/T 16521-1996 General arrangements for interworking between packet switched public data networks (PSPDN) and circuit switched public data networks (CSPDN) for the provision of data transmission services

译：GB/T 15839-1995 Networking specifications for 64～1920kbit/s videoconferencing systems

译：GB/T 15837-1995 Synchronization interface-requirements for digital network

译：GB/T 2886-1992 Technical requirements for group 2 document facsimile apparatus used in public telephone network

译：GB/T 7610-1987 Characteristics of pulse code modulation for voice-frequencies

译：GB/T 7555-1987 General characteristics complying with the network performance objectives for 12 channel carrier telephone systems on open-wire pairs