组合使用关键词、标准类型、状态与 ICS 分类，快速定位所需国家标准。
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GB/T 17904.1-1999
ISDN user-network interface data link layer specification and conformance testing method--Part 1:User-network interface data linklayer specification
GB/T 13621-1999
Capacity series and radio-frequency channel arrangement and equipment main technical specifications for 100～1000 MHz radio relay communication systems
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
GB/T 17114-1997
Requirement for 160 kbit/s subscriber line digital multigain equipment joined to national public telecommunication network
GB/T 16858-1997
A far end camera control protocol for videoconfer-ences using data link protocol
GB/T 16813-1997
Technical specifications and test methods of the interface of radio paging system and PSTN
GB/T 9405-1995
Performance and test methods of the third order digital multiplex equipment operating at 34368 kbit/s and using positive justification
GB/T 14733.11-1993
Terminology for telecommunications--Telecommnications using transmission
GB/T 13169-1991
General specification for 4MHz (960ch) carrier systems on standardized 1.2/4.4 mm coaxial cable pairs
GB/T 13168-1991
General specification for 8MHz (1800ch) carrier systems on standardized 2.6/9.5mm coaxialcable pairs
GB/T 9541-1988
2400 bits per second duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2 wire leased telephone-type-circuits
GB/T 7554-1987
Protected 5-unit numerical code for telegram service
GB/T 7438-1987
Numbering for telex and low speed data in national communication network
GB/T 5438-1985
Characteristics and measuring methods for monophonic and stereophonic transmissions
GB/T 4110-1983
Pulse code modulation communication system hierarchy
GB/T 3383-1982
Telecommunication transmission unit--Decibel
GB/T 2789-1981
Technical requirements for network interface for the analogue microwave relay communication systems