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GB/T 7424.20-2021: Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions
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Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions
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GB/T 7424.20-2021
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Basic data | Standard ID | GB/T 7424.20-2021 (GB/T7424.20-2021) | | Description (Translated English) | Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | M33 | | Word Count Estimation | 10,129 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 7424.20-2021: Optical fibre cable generic specification - Part 20: Basic optical cable test procedures - General and definitions
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Optical fibre cable generic specification - Part 20.Basic optical cable test procedures - General and definitions
ICS 33.180.10
M33
National Standards of People's Republic of China
Partially replace GB/T 7424.2-2008
General Specification for Optical Fiber Cables Part 20.Basic Test Methods for Optical Fiber Cables
General rules and definitions
(IEC 60794-1-2.2017, Opticalfibrecables-
Released on 2021-04-30 and implemented on 2021-11-01
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 General 2
Appendix A (informative appendix) Structure changes of this part compared with IEC 60794-1-2.2017 5
Appendix B (Informative Appendix) Sampling Guide for Optical Cable Verification Test 6
Reference 7
Foreword
GB/T 7424 is divided into the following 9 parts.
---Optical Cable General Specification Part 1.General;
---General Specification for Optical Cables Part 20.General Principles and Definitions of Basic Test Methods for Optical Cables;
---General Specification for Optical Cables Part 21.Basic Test Methods for Optical Cables, Mechanical Performance Test Methods;
---General Specification for Optical Cables Part 22.Basic Test Methods for Optical Cables, Environmental Performance Test Methods;
---General Specification for Optical Cables Part 23.Basic Test Methods for Optical Cables Test Methods for Optical Cable Components;
---General Specification for Optical Cables Part 24.Basic Test Methods for Optical Cables, Electrical Test Methods;
---Optical Cable Part 3.Sectional Specification for Outdoor Optical Cable;
---Optical Cable Part 4.Sectional Specification Optical Fiber Composite Overhead Ground Wire;
---Optical Cable Part 5.Sectional Specification for Miniature Optical Cable and Optical Fiber Unit for Air Blown Installation.
This part is Part 20 of GB/T 7424.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
GB/T 7424.20~GB/T 7424.24 jointly replace GB/T 7424.2-2008 "General Specification for Optical Cable Part 2.Optical Cable Basic
experiment method". This part replaces Chapter 3 and Chapter 4 in GB/T 7424.2-2008.This part and GB/T 7424.2-2008
Compared with Chapter 3, the main technical changes are as follows.
---Modified the temperature and humidity in the standard test conditions (see 4.2.2, 3.4.1 of the.2008 edition);
---Added loose test conditions (see 4.2.3);
---Modified the sample pretreatment time (see 4.2.4, 3.4.2 of the.2008 edition);
--- The title of the article "safety" is revised to "safety and environment", and specific content has been added (see 4.3, 3.6 of the.2008 edition);
--- Change the title of the article "calibration" to "calibration" (see 4.4, 3.7 of the.2008 edition);
--- Deleted the "optical cable test" (see Chapter 4 of the.2008 edition);
---Added "Optical Cable Verification" (see 4.5);
---Added "light injection conditions" (see 4.6);
--- Added "standard light test wavelength" (see 4.7).
This part uses the redrafting method to modify and adopt IEC 60794-1-2.2017 "Optical Cable Part 1-2.General Specification Optical Cable Basic Test
General Principles of Methods.
Compared with IEC 60794-1-2.2017, this part has more structural adjustments. Appendix A lists this part and IEC 60794-1-2.
The.2017 chapter number comparison list.
The technical differences between this part and IEC 60794-1-2.2017 and the reasons are as follows.
---Regarding normative reference documents, this section has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.
The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.
● Replace IEC 60793-2-40 with non-equivalent adopting international standard GB/T 12357.4;
● Replace IEC 60793-1-40 with GB/T 15972.40 which is modified to adopt international standards;
● Replace IEC 60793-1-46 with GB/T 15972.46 which is modified to adopt international standards;
● Added reference to GB/T 8170;
● Added reference to GB/T 15972.22-2008.
--- Chapter 3 lists specific terms and definitions.
---Modify the heading "standard environmental conditions" of section 4.2 of IEC 60794-1-2.2017 to "test environmental conditions and sample pre-treatment
Management” and rearrange the content.
---The 4.3 "Symbols and Abbreviations" of IEC 60794-1-2.2017 is deleted.
---Move the content of 4.6 of IEC 60794-1-2.2017 to 4.2 "Sample environmental conditions and sample pretreatment".
--- 4.8 has increased the "quantity value" requirement.
---4.9 The requirement of "monitoring and inspection" has been added.
This section has made the following editorial changes.
--- Modify the standard name to "General Specification for Optical Cables Part 20.General Principles and Definitions of Basic Test Methods for Optical Cables";
---Informative Appendix B "Guidelines for Sampling of Optical Cable Verification Tests" has been added.
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This part is under the jurisdiction of the National Communication Standardization Technical Committee (SAC/TC485).
Drafting organizations of this section. Sichuan Huiyuan Optical Communication Co., Ltd., Chengdu Terui Communication Equipment Testing Co., Ltd., Datang Telecom Technology Industry
Group, Jiangsu Yongding Co., Ltd., Jiangsu Hengtong Optoelectronics Co., Ltd., Fiberhome Technology Group Co., Ltd., YOFC
Co., Ltd., Chengdu Datang Cable Co., Ltd., China Academy of Information and Communications Technology, Jiangsu Nanfang Communication Technology Co., Ltd., Tongding Internet Information Co., Ltd.
Co., Ltd.
The main drafters of this section. Zhao Qiuxiang, Luo Yi, Song Zhituo, Mo Siming, Liu Cheng, Li Jing, Xue Mengchi, Chen Xiaohong, Huang Zhengou, Peng Yuan, Shi Bin,
Gan Lu, Sun Guofang, Duan Jianbin, Liu Tai, Xiao Rengui.
The previous releases of the standards replaced by this part are as follows.
---GB/T 7425 (all parts)-1987;
---GB/T 8405 (all parts)-1987;
---GB/T 7424.1-1998 (Chapter 3 and Chapter 6);
---GB/T 7424.2-2002, GB/T 7424.2-2008 (Chapter 3 and Chapter 4).
General Specification for Optical Fiber Cables Part 20.Basic Test Methods for Optical Fiber Cables
General rules and definitions
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 (ΔA) is not greater than 0.05dB, or the absolute value of the attenuation coefficient change (Δa)
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 |ΔA|≤0.05dB or |Δa|≤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.
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