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Standards GB - Chinese national standards - Page 583
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
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GB/T 15972.45-2021
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Specifications for optical fibre test methods—Part 45Measurement methods and test procedures for transmission characteristics—Mode field diameter
Standard published on 30.4.2021
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GB/T 15972.46-2008
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Specifications for optical fibre test methods - Part 46: Measurement methods and test procedures for transmission and optical characteristics - Monitoring of changes in optical transmittance
Standard published on 31.3.2008
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GB/T 15972.47-2021
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Specifications for optical fibre test method—Part 47Measurement methods and test procedures for transmission characteristics—Macrobending loss
Standard published on 21.5.2021
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GB/T 15972.48-2016
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Specifications for optical fibre test methods—Part 48: Measurement methods and test procedures for transmission and optical characteristics—Polarization mode dispersion
Standard published on 25.4.2016
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GB/T 15972.48-2026
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Specifications for optical fibre test methods—Part 48: Measurement methods and test procedures for transmission characteristics—Polarization mode dispersion
Execute Date: november 2026
Standard published on 30.4.2026
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GB/T 15972.49-2021
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Specifications for optical fibre test methods—Part 49: Measurement methods and test procedures for transmission characteristics—Differential mode delay
Standard published on 11.10.2021
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GB/T 15972.50-2008
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Specifications for optical fibre test methods - Part 50: Measurement methods and test procedures for environmental characteristics - Damp heat(steady state)
Standard published on 10.4.2008
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GB/T 15972.51-2008
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Specifications for optical fibre test methods - Part 51: Measurement methods and test procedures for environmental characteristics - Dry heat
Standard published on 31.3.2008
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GB/T 15972.52-2008
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Specifications for optical fibre test methods - Part 52: Measurement methods and test procedures for environmental characteristics - Change of temperature
Standard published on 31.3.2008
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GB/T 15972.53-2008
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Specifications for optical fibre test methods - Part 53: Measurement methods and test procedures for environmental characteristics - Water immersion
Standard published on 31.3.2008
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