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National Standard for Standard Optical Cables

The latest national standard for optical cables in China is GB/T 7424. 3-2025, specifying outdoor optical cable requirements and aligning with IEC 60794-3. 2022.

GB/T 7424 Series OverviewThe GB/T 7424 series is the national standard system for optical cables in China, providing specifications, test methods, and quality assurance guidelines for various types of optical fiber cables. The series includes: GB/T 7424. 1: General provisions for optical cablesGB/T 7424.

2: Basic test methods for optical cablesGB/T 7424. 3-2025: Specifications for outdoor optical cables, replacing the 2003 version and implemented on February 1, 2026 GB/T 7424. 3-70: Standards for outdoor fast/multi-layer optical cablesGB/T 7424.

4: Fiber optic composite overhead ground wireGB/T 7424. 5: Miniature optical cables and air-blown fiber unitsGB/T 7424. 20–24: General rules and test methods for mechanical, environmental, and electrical performance The 2025 update of GB/T 7424.

3 incorporates structural adjustments, editorial changes, and technical updates aligned with IEC 60794-3. 2022, covering optical fiber characteristics, cable components, structure, mechanical and environmental adaptability, and testing methods.

IE

C 60794-1-1: 2023 AlignmentThe IEC 60794-1-1: 2023 standard provides international guidance for optical fiber cables, specifying uniform requirements for geometrical, transmission, material, mechanical, ageing, climatic, and electrical properties. This edition updates optical fiber, attenuation, and bandwidth subclauses, serving as a reference for the GB/T 7424 series and other IEC 60794-x standards. ITU-T L.

103 RecommendationFor indoor optical cables, the ITU-T L. 103 (2024) recommendation defines cable characteristics, construction, and test methods to ensure proper performance in indoor environments. While compliance is voluntary, it provides a globally recognized framework for indoor fiber installations.

Practical Implications

Manufacturers must follow GB/T 7424. 3-2025 for outdoor cables to meet national compliance and quality assurance requirements. Testing and inspection should adhere to the standardized mechanical, environmental, and optical performance methods outlined in the GB/T 7424 and IEC 60794 series.

Designers and installers can reference ITU-T L. 103 for indoor cable selection and performance verification. These standards collectively ensure high-quality, reliable optical cable deployment across outdoor and indoor applications, supporting both domestic and international interoperability.

National Standard for Standard Optical Cables

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