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GB/T 7424.20-2021Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

April 30, 2021

Implementation date

November 1, 2021

Scope

GB/T 7424.20-2021 (Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions) is available as an English-translated PDF.

GB/T 7424.20-2021 is the Chinese standard "Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions".

Its scope clause reads: This part of GB/T 7424 specifies the general requirements for the test methods of optical cable mechanical properties, environmental properties, components and electrical properties.

Including terms and definitions, general rules. This section applies to optical cables and optical hybrid cables used in communication equipment and devices using similar technologies.

It also applies to optical fiber units, Micro-tube fiber unit, etc. Its clauses include terms and definitions.

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Document preview — GB/T 7424.20-2021

National Standard of the People's Republic of China

Classification: M 33

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General
Appendix A (informative appendix) Structure changes of this part compared with IEC 60794-1-2.2017
Appendix B (Informative Appendix) Sampling Guide for Optical Cable Verification Test

1 Scope

This part of GB/T 7424 specifies the general requirements for the test methods of optical cable mechanical properties, environmental properties, components and electrical properties.

Including terms and definitions, general rules.

This section applies to optical cables and optical hybrid cables used in communication equipment and devices using similar technologies. It also applies to optical fiber units,

Micro-tube fiber unit, etc.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article

Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 12357.4 Multimode Optical Fiber for Communication Part 4.Characteristics of Type A4 Multimode Optical Fiber (GB/T 12357.4-2016, IEC 60793-2-40.2009, NEQ)

GB/T 15972.22-2008 Optical fiber test method specification Part 22.Measurement method of dimensional parameters and test procedure length (IEC 60793-1-22.2001, MOD)

GB/T 15972.40 Specification for optical fiber test methods Part 40.Measurement methods and test procedures for transmission characteristics and optical characteristics

Attenuation (GB/T 15972.40-2008, IEC 60793-1-40.2001, MOD)

GB/T 15972.46 Specification for optical fiber test methods Part 46.Measurement methods and test procedures for transmission characteristics and optical characteristics

Transmittance change (GB/T 15972.46-2008, IEC 60793-1-46.2001, MOD)

IEC 60794-1-1.2015 Optical fiber cable Part 1-1.General specification (Opticalfibrecables-Part 1-1.Generic specification-General)

3 Terms and definitions

The terms and definitions defined in IEC 60794-1-1.2015 apply to this document. For ease of use, the following is repeated

Certain terms and definitions in IEC 60794-1-1.2015.

3.1 Nochangeinattenuation

Acceptance criteria for attenuation measurement.

Note 1.No change in attenuation includes measurement uncertainty caused by measurement error, or calibration error caused by the lack of a suitable reference standard.

Note 2.In actual understanding, the following values are used.

a) No change in attenuation of type B single-mode fiber. the absolute value of the total attenuation change (deltaA) is not greater than 0.05dB, or the absolute value of the attenuation coefficient change (deltaa)

The value is not more than 0.05dB/km. Any measured value within this range is regarded as "no change in attenuation".

The requirements for these parameters are expressed as. "no change" (ie |deltaA|<=0.05dB or |deltaa|<=0.05dB/km).

After negotiation between the user and the supplier, a small deviation of the low frequency deviation from this limit can be accepted, for example, less than 10%. However, for the mechanical performance test

Test, accept the deviation of not more than 0.15dB. For the environmental performance test, a deviation of not more than 0.10dB/km is accepted.

YD/T 2554.1 | GB/T 9771.1 | GB/T 20186.1 | GB/T 7424.23 | GB/T 7424.22 | GB/T 7424.21 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60793 · IEC 60794

Cited by

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