GB/T 7424.3-2025Optical fibre cables - Part 3: Sectional specification - Outdoor cables (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 3 of GB/T 7424 "Optical Cables". GB/T 7424 has the following parts published.

---Optical Cable General Specification Part 1: General Provisions (GB/T 7424.1);

---Optical Cable General Specification Part 2: Basic Test Methods for Optical Cables (GB/T 7424.2);

---Optical Cable Part 3: Specifications for Outdoor Optical Cables (GB/T 7424.3);

---Optical Cable Part 3-70.Standard for Outdoor Fast/Multiple-Layer Optical Cables (GB/T 7424.370);

---Optical Cable Part 4: Specifications for Fiber Optic Composite Overhead Ground Wire (GB/T 7424.4);

---Optical Cables Part 5: Specifications for Miniature Optical Cables and Fiber Optic Units for Air-blown Installation (GB/T 7424.5);

---Optical Cable General Specification Part 20: General Rules and Definitions of Basic Test Methods for Optical Cables (GB/T 7424.20);

---General Specification for Optical Cables, Part 21: Basic Test Methods and Mechanical Performance Test Methods for Optical Cables (GB/T 7424.21);

---General Specification for Optical Cables, Part 22: Basic Test Methods and Environmental Performance Test Methods for Optical Cables (GB/T 7424.22);

---General Specification for Optical Cables, Part 23: Basic Test Methods for Optical Cables, Test Methods for Optical Cable Components (GB/T 7424.23);

---General Specification for Optical Cables, Part 24: Basic Test Methods and Electrical Test Methods for Optical Cables (GB/T 7424.24).

This document supersedes GB/T 7424.3-2003 "Optical Cables Part 3: Specifications for Outdoor Optical Cables" and is consistent with GB/T 7424.3-2003.

Compared to previous versions, aside from structural adjustments and editorial changes, the main technical changes are as follows.

a) The term "single-mode optical cable" in the scope has been changed to "outdoor optical cable" (see Chapter 1, Chapter 1 of the 2003 edition), and has been expanded to include applications for "fast..." High-speed/multi-deployment optical cables, as well as optical cables specifically designed for sewage pipes and gas pipelines (see Chapter 1);

b) Changes have been made to the terminology, definitions, symbols, and abbreviations (see Chapter 3, Chapters 3 and 4 of the 2003 edition);

c) Added requirements for multimode fiber types and performance (see 4.1, 4.2, 4.6);

d) The measurement method for polarization mode dispersion (PMD) has been changed (see 4.5, 5.5 in the 2003 edition);

e) Measurement of the cutoff wavelength of patch cord optical cables has been removed (see 5.6 in the 2003 edition);

f) The term "loose tube fiber" was changed to "polymer tube" (see 5.5, 6.4 of the 2003 edition);

g) Increased requirements for polymer casing hardness, flexibility, etc., and improved methods for measuring oil separation and evaporation of the composite material filled in the casing (see...).

h) The structural and dimensional requirements for the fiber optic ribbon have been changed to "comply with IEC 60794-1-31" (see 5.6, 6.5 of the 2003 version), and the following has been added.

The fiber optic guidance system for chromatographic identification is described in section 5.6.

i) Increased requirements for metal tubing (see 5.7);

j) Added longitudinal water permeability tests for the cable core and compound drip tests for the optical cable (see 6.3);

k) The dimensions and peel strength requirements of the aluminum strip in the moisture barrier have been changed (see 6.5, 7.5 in the 2003 version), and the continuity of the electrical charge on the metal strip in the moisture barrier has been added.

Sexual requirements (see 6.5);

l) Additional tests and requirements have been added for the tensile strength, elongation at break, and resistance to environmental stress cracking of the optical cable outer sheath (see 6.6.3);

m) Added requirements for sheath marking content, character spacing, and fiber optic cable length marking (see 6.7);

n) Added content regarding installation and usage conditions (see Chapter 7);

o) The lightning test (see Chapter 9 in the 2003 edition) has been removed, and fiber stripping, flexibility, UV resistance, external freezing, and immersion tests have been added.

Mineral oil testing (see Chapter 9).

This document is modified to adopt IEC 60794-3:2022 "Optical cables - Part 3: Outdoor optical cables".

This document has undergone the following structural adjustments compared to IEC 60794-3:2022.

---Increased by 4.6;

---Appendix A has been added.

This document differs significantly from IEC 60794-3:2022.The relevant clauses are indicated in the margins using vertical markers.

Straight lines (|) are marked. A summary of these technical differences and their reasons can be found in Appendix A.

The following editorial changes have been made to this document.

---To align with existing standards, the standard name has been changed to "Optical Cable Part 3: Specification for Outdoor Optical Cables";

---Added support for "rapid/multiple fiber optic cable deployment";

---Change descriptive content in the scope to comments.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.

Introduction

Optical fiber, as the core medium for optical signals, is widely used in transmission and access networks, data centers, power transmission, and security monitoring.

Fiber optic signal transmission is the cornerstone of building modern communication networks. With the continuous emergence of new technologies, materials, and products in the field of fiber optic communication...

Currently, related testing and measurement technologies are developing rapidly. This is to ensure that the technical requirements, testing, and measurement procedures for optical cable products are standardized globally.

Standards, promoting international trade. The International Electrotechnical Commission (IEC) has developed and implemented the IEC 60794 series of standards, covering the mechanical properties of optical cables.

Test methods for electrical and mechanical properties, environmental performance, optical fiber cable components, and electrical testing methods, as well as test methods for optical fiber cable components, indoor optical fiber cables, and outdoor optical fiber cables.

Products include optical cables, optical cables laid along power lines, micro-duct cables/pipes for air-blowing installation, indoor and outdoor optical cables, fire-resistant optical cables, and vehicle-mounted optical cables.

These standards provide an important basis for the inspection and acceptance of optical cable products internationally.

The GB/T 7424 series of standards for optical cables, referencing the IEC 60794 series of standards, has established a systematic set of test methods, measurement methods, and product specifications.

Standardization System. This series of standards aims to provide a standardized set of performance evaluation criteria and product testing methods for the domestic optical cable industry, effectively guiding...

To guide the research, development, production, testing and application of domestic optical cable products, so as to promote the high-quality development of my country's fiber optics industry.

The GB/T 7424.3× "Outdoor Optical Cable" series of standards is proposed to consist of the following parts.

---Part 3: Standards for Outdoor Optical Cables. The purpose is to standardize the general requirements and testing methods for outdoor optical cables.

---Part 3-10.Standards for Outdoor Optical Cable Conduits, Direct Burial, and Bundled Aerial Communication Optical Cables. The purpose is to standardize the relevant optical cables.

Performance requirements and testing methods for various product categories.

---Part 3-20.Standards for Outdoor Self-Supporting Aerial Communication Optical Cables. The purpose is to standardize the relevant optical cable product categories.

Performance requirements and testing methods.

---Part 3-30.Specifications for outdoor optical fiber cables crossing lakes and rivers and laid along the coast. The purpose is to regulate...

Specifications for the performance requirements and testing methods of corresponding optical cable products.

---Parts 3-40.Standards for outdoor optical cables laid along rainwater and sewage pipes. The purpose is to standardize the corresponding optical cable categories.

Product performance requirements and testing methods.

---Part 3-70.Specifications for Outdoor Fiber Optic Cables (Rapid/Multiple Deployment Types). The purpose is to standardize the relevant fiber optic cable product categories.

Performance requirements and testing methods.

Optical Cable Part 3: Standard Outdoor Optical Cable

1 Scope

This document specifies the requirements for outdoor optical cables and optical cable components used in communication networks.

This document applies to duct optical cables, direct-buried optical cables, overhead optical cables, underwater optical cables crossing lakes and rivers, fast/multiple-layout optical cables, and special-purpose optical cables.

The gate is applied to optical cables for sewage pipes and gas pipelines; other similar applications of optical cables can be referenced for application.

Note 1.For optical cables installed near overhead power lines, additional requirements and test methods are required.

This document does not apply to fiber optic composite overhead ground wires, fiber optic composite phase wires, or optical cables suspended from phase or ground wires of overhead transmission lines.

Not applicable to optical cables with underwater line amplifiers.

Note 2.This document does not specify the maintenance methods and performance requirements for underwater optical cables crossing lakes and rivers.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 2951.11 General test methods for insulation and sheathing materials of cables and optical fibers—Part 11: General test methods for thickness and Dimensional measurement and mechanical property testing (GB/T 2951.11-2008, IEC 60811-1-1:2001, IDT) GB/T 2951.12 General test methods for insulation and sheathing materials of cables and optical fibers - Part 12: General test methods - thermal aging Test methods (GB/T 2951.12-2008, IEC 60811-1-2:1985, IDT) GB/T 2951.21 General test methods for insulation and sheathing materials of cables and optical fibers - Part 21: Tests for elastomer mixtures Methods. Ozone resistance test - Heat stretching test - Mineral oil immersion test (GB/T 2951.21-2008, IEC 60811-2-2:2001, IDT) GB/T 2951.41-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 41: Polyethylene and Polypropylene Special test methods for mixtures. environmental stress cracking test, melt index measurement method, direct combustion method for measuring carbon black and...

(or) Thermogravimetric analysis (TGA) to measure carbon black content; microscopic evaluation of carbon black dispersion in polyethylene.

(IEC 60811-4-1:2004, IDT) GB/T 2951.51-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 51: Tests for Filler Pastes Methods. Dropping oil separation, low-temperature brittleness, total acid value, corrosiveness, dielectric constant at 23°C, and direct current at 23°C and 100°C.

Resistivity (IEC 60811-5-1:1990, IDT) GB/T 6995.2 Methods for Identification Marking of Wires and Cables Part 2: Standard Colors GB/T 7424.21-2021 General Specification for Optical Cables Part 21: Basic Test Methods and Mechanical Performance Test Methods for Optical Cables (IEC 60794-1-21:2020, MOD) Note. The content referenced in GB/T 7424.21-2021 has no technical differences from the content referenced in IEC 60794-1-21:2020.

GB/T 7424.22-2021 General Specification for Optical Cables Part 22: Basic Test Methods and Environmental Performance Test Methods for Optical Cables (IEC 60794-1-22:2017, MOD) Note. The content referenced in GB/T 7424.22-2021 is not technically different from the content referenced in IEC 60794-1-22:2017.

GB/T 7424.23-2021 General Specification for Optical Cables Part 23: Basic Test Methods for Optical Cables and Test Methods for Optical Cable Components (IEC 60794-1-23:2019, MOD) Note. The content referenced in GB/T 7424.23-2021 is not technically different from the content referenced in IEC 60794-1-23:2019.

GB/T 7424.24-2020 General Specification for Optical Cables Part 24: Basic Test Methods and Electrical Test Methods for Optical Cables (IEC 60794-