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Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
Multicore and symmetrical pair/quad cables for digital communications - Part 21: Horizontal floor wiring - Blank detail specification
WITHDRAWN published on 23.1.2007
Selected format:Multicore and symmetrical pair/quad cables for digital communications—Part 3:Horizontal floor wiring—Blank detail specification
WITHDRAWN published on 11.11.1999
Selected format:Multicore and symmetrical pair/quad cables for digital communications - Part 3Work area wiring - Sectional specification
WITHDRAWN published on 23.1.2007
Selected format:Multicore and symmetrical pair/quad cables for digital communications - Part 31: Work area wiring - Blank detail specification
WITHDRAWN published on 23.1.2007
Selected format:Multicore and symmetrical pair/quad cables for digital communications—Part 4:Work area wiring—Sectional specification
WITHDRAWN published on 11.11.1999
Selected format:Multicore and symmetrical pair/quad cables for digital communications- Part 4Riser cables - Sectional specification
WITHDRAWN published on 23.1.2007
Selected format:Multicore and symmetrical pair/quad cables for digital communications - Part 41: Riser cables - Blank detail specification
WITHDRAWN published on 23.1.2007
Selected format:Multicore and symmetrical pair/quad cables for digital communications—Part 5:Work area wiring—Blank detail specification
WITHDRAWN published on 11.11.1999
Selected format:Multicore and symmetrical pair/quad cables for digital communications - Part 5: Symmetrical pair/quad cables with transmission characteristics up to 600MHz - Horizontal floor wiring - Sectional specification
WITHDRAWN published on 23.1.2007
Selected format:Multicore and symmetrical pair/quad cables for digital communications—Part 6:Riser cables—Sectional specification
WITHDRAWN published on 11.11.1999
Selected format:Latest update: 2026-06-14 (Number of items: 2 282 206)
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