译：GB/T 13426-1992 Reliability requirements and test methods for digital communication equipment

译：GB/T 13427-1992 Performance requirement of the delta modulation equipment

译：GB/T 13428-1992 Methods of measurement for the delta modulation equipment

译：GB/T 13158-1991 Compatibility test procedures of clock and synchronization equipment of digital switch introduced into digital network

译：GB/T 12640-1990 Methods of measurement for the digital microwave radio relay communication equipments

译：GB/T 12171-1990 Specification for TDM/FDM 60-channel Tran-multiplexing equipments used in the telecommunication network

译：GB 12048-1989 Requirements for clock and synchronization equipment used in the digital network

译：GB/T 7585-1987 Capacity series and radio-frequency channel arrangement for analog microwave relay systems

译：GB/T 7556-1987 General characteristics complying with the network performance objectives for 60 channel carrier telephone systems on symmetric cable pairs

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

译：GB/T 7557-1987 General characteristics complying with the network performance objectives for 300 channel carrier telephone systems on standardized 1.2/4.4mm coaxial cable pairs

译：GB/T 7436-1987 Specifications of TDM equipment operating on an analog telephone-type circuit for telegraph and lower-speed data

译：GB/T 4827-1984 Requirements of data transmission at 50 bit/s

译：GB/T 4575-1984 Frequency comparison pilot series for the FDM systems in the toll communication network

译：GB/T 3384-1982 Parameters of interface for the analogue carrier systems over the network