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GB/T 4958.1-1985
Methods of measurement for equipment used in terrestrial radio-relay systems--Part 1:Measurements common to subsystems and simulated systems--Section One--General
GB 4877-1985
Intermediate frequencies of television
GB/T 4827-1984
Requirements of data transmission at 50 bit/s
GB 4824-2001
Industrial,scientific and medical(ISM) radio-frequency equipment-Electromagnetic disturbance characteristics-Limits and methods of measurement
GB/T 4575-1984
Frequency comparison pilot seriesfor the FDM systems in the toll communication network
GB/T 4364-1984
Signs of operating directions of manual control mechanism of telecommunication equipments
GB/T 4312.2-1984
Technical parameters and measuring methods for FM stereophonic broadcasting transmitters with supplementary channel
GB/T 4312.1-1984
Technical parameters and measuring methods for FM broadcasting transmitters--Monophonic and stereophonic
GB/T 4110-1983
Pulse code modulation communication system hierarchy
GB 3971.2-1983
Interoffice junction digital line signalling system for telephone automatic switching network
GB/T 3974-1983
Telephone transmission interference allowances for long-distance high-capacity analogue microwave communication systems
GB/T 3873-1983
General specifications for products packaging of communication equipments
GB/T 3659-1983
Methods of measurement of television video channel
GB/T 3660-1983
Unified weighting network for measuring video continuous random noise
GB/T 3455-1982
Electrical characteristics for unbalanced double-current interchange circuits
GB/T 3451-1982
Standard tuning frequency
GB/T 3380-1982
Ringing and tone for telephone automatic switching network
GB/T 3378-1982
Subscriber line signalling system for telephone automatic switching network
GB/T 3377-1982
Multifrequency register signalling system for telephone automatic switching network
GB/T 3384-1982
Parameters of interface for the analogue carrier systems over the network