BS 7870-5 The Ultimate Guide to Optic Fiber Cables

2024-10-08 09:19:52 0

Abstract

BS 7870-5 is a British Standard that specifically focuses on the requirements for optical fiber cables used in telecommunications. This article aims to provide a detailed explanation of BS 7870-5, covering four main aspects: cable construction, performance characteristics, installation considerations, and testing requirements. By understanding the specifications outlined in this standard, professionals in the cable industry can ensure compliance and deliver high-quality products and installations.

1. Cable Construction

The construction of optical fiber cables plays a crucial role in their performance and durability. BS 7870-5 provides guidelines for various components used in cable construction, including fibers, strength members, fillers, binders, water-blocking elements, and outer sheaths.

Fibers are typically made of glass or plastic materials with high transmission capabilities. Strength members provide mechanical support to prevent excessive stretching or bending of the fibers during installation or operation. Fillers are used to maintain the shape of the cable core while binders hold all components together.

Water-blocking elements such as tapes or gels are essential to protect against moisture ingress that could degrade signal quality over time. Outer sheaths provide additional protection against environmental factors like UV radiation or physical damage.

2. Performance Characteristics

To ensure reliable communication through optical fiber cables conforming to BS 7870-5 standards must meet specific performance characteristics defined by this standard.

The attenuation characteristic measures how much signal loss occurs along the length of a cable due to absorption and scattering effects within the fiber itself. Low attenuation values indicate better signal transmission efficiency.

Cable manufacturers must also consider other parameters such as chromatic dispersion (the spreading out of different wavelengths), polarization mode dispersion (variations in propagation speeds), and bandwidth capacity (maximum data rate supported).

3. Installation Considerations

The proper installation techniques greatly influence long-term reliability and functionality when it comes to optical fiber cables complying with BS 7870-5 standards.

This standard emphasizes avoiding excessive tension during installation as it can cause microbending losses or even breakage within fibers over time. Proper bend radius should be maintained at all times according to manufacturer recommendations.

Adequate protection from environmental factors like moisture ingress is critical for maintaining optimal performance levels throughout an extended lifespan. Installation practices should include appropriate sealing methods at entry points into buildings or underground conduits where necessary.

4.Testing Requirements

Testing is an integral part of ensuring compliance with BS 7870-5 standards.

Cable manufacturers need to perform rigorous tests on their products before they reach customers.

These tests may include measuring attenuation levels, determining chromatic dispersion, and verifying mechanical properties such as tensile strength.

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