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 13621-1999
Capacity series and radio-frequency channel arrangement and equipment main technical specifications for 100～1000 MHz radio relay communication systems
GB/T 17801-1999
Interface betweendata 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 service
GB/T 11590-1999
International data transmission services and optional user facilities in public data networks and ISDNs
GB/T 11589-1999
International user classes of service in，and categories of accessto，public data networks and integrated services digital networks(ISDNs)
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 16816-1997
A 48/56/64 kbit/s data circuit terminating equipment standardized for use on digital point-to-point leased circuits
GB/T 16522-1996
General arrangements for interworking between packet switched public data networks (PSPDN)
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
GB/T 6879-1995
Performance andtest methods of the 30 channels pulse code modulation multiplex equipment at 2048 kbit/s
GB/T 15940-1995
Basic multiplexing structure for synchronous digital hierarchy signals
GB/T 7609-1995
General test method for transmission performance of PCM voice channel in telecommunication network
GB/T 15698-1995
Information technology--Telecommunications and information exchange between systems--High-level data link control (HDLC)procedures--General purpose XID frame information field content and format
GB/T 15629.2-1995
Information processing systems--Local area networks--Part 2:Logical link control
GB/T 15629.3-1995
Information processing systems--Local area networks--Part 3:Carrier sense multiple access with collision detection(CSMA/CD)--Access method and physical layer specifications
GB/T 7254-1995
Performanceand methods of the second order digital multiplex equipment operating at 8448 kbit/s and using positive justification
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 11324-1995
Performance and test methods of the fourth order digital multiplex equimpent operatingat 139264 kbit/s and using positive justification