Code of China Chinese Standard Classification Professional Classification ICS Classification Latest
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YD/T 1990-2009 General technical requirements for Optical Transport Network 1080.0 via email in 1~3 business day valid
GB/T 4110-1983 Pulse code modulation communication system hierarchy 60.0 via email in 1~3 business day valid
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 5070.0 via email in 1~3 business day valid
GB/T 15409-2008 Frame structure for synchronous digital hierarchy signal 420.0 via email in 1~5 business day valid
GB/T 18119-2000 Video coding for low bit rate communication 450.0 via email in 1~3 business day valid
GB/T 16712-2008 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks 2850.0 via email in 1~3 business day valid
GB/T 7554-1987 5-unit numerical code for telegram service 60.0 via email in 1~3 business day valid
GB/T 21645.6-2009 Technical requirements for automatically switched optical network—Part 6:Management plane 360.0 via email in 1~5 business day valid
GB/T 14733.11-1993 Terminology for telecommunications-Telecommnication 690.0 via email in 1~8 business day superseded
GB/T 3383-1982 Telecommunication transmission unit; Decibel 30.0 via email in 1~3 business day valid
YD/T 1991-2009 Technical requirements for N×40Gbit/s optical wavelength division multiplexing (WDM) systems 420.0 via email in 1~3 business day superseded
GB/T 7611-2016 Characteristic of the electrical interface at hierarchical bit rate for digital network 1305.0 via email in 1~10 business day valid
YD/T 1274-2003 Technical specification for optical Wavelength Divison Multiplexing (WDM) system 160×10Gb/s and 80×10Gb/s part 540.0 via email in 1~5 business day valid
YD/T 1959-2009 Technical Requirements for 2048kbit/s Optical Interface Between Relaying Protection Equipment and Multiplexer 150.0 via email in 1~3 business day valid
GB/T 2789-1981 Technical requirements for network interface for the analogue microwave relay communication systems 120.0 via email in 1~3 business day valid
YD/T 1745-2009 Security protection testing requirements for transport network 390.0 via email in 1~3 business day valid
YD/T 1961-2009 Technical Requirements for SDH-based Multi-service Transport Platform (MSTP)--Interoperatibility 180.0 via email in 1~3 business day valid
GB/T 13621-1999 series and radio-frequency channel arrangement and equipment main technical specifications for 100~1 000MHz radio relay communication systems 240.0 via email in 1~3 business day valid
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 270.0 via email in 1~3 business day valid
YD/T 847-1996 Frame Structures of 64 -1920kbit/S Channels in Audiovisual Telecommunication Services 390.0 via email in 1~3 business day valid
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