Title: Specification and Requirements for Pre-Buried Communication Cables in Railway Systems

Pre-Buried Communication Cables play a crucial role in maintaining efficient and reliable communication networks within railway systems. The purpose of this document is to establish specific requirements for these cables in order to ensure their safe and effective use. The following guidelines must be followed: 1. Type of cable: The cable must be suitable for underground use, with a high resistance to moisture, corrosion, and vibration. 2. Diameter: The diameter of the cable should be sufficient to provide adequate bandwidth for signal transmission, while also minimizing interference with other underground utilities. 3. Installation method: Pre- Buried Communication Cables must be installed according to established specifications, with attention paid to factors such as soil type, temperature, and pressure. 4. Termination points: Cable termination points must be securely mounted to prevent damage or unauthorized access. 5. Testing and maintenance: Regular testing and maintenance of Pre-Buried Communication Cables is necessary to ensure their continued reliability and performance. By following these guidelines, railway systems can maintain secure and efficient communication networks that are essential for safe and reliable transportation of passengers and goods.

Introduction

The railway system is an essential transportation infrastructure that connects different cities and regions, facilitating the movement of people, goods, and services. As such, it requires reliable and efficient communication systems to ensure the proper functioning of the entire network. One of the critical components of these communication systems is the铁路通信电缆， which plays a vital role in transmitting data, control signals, and voice messages between railway stations, trains, and other related equipment. The proper installation and maintenance of these cables are crucial to ensure their longevity and optimal performance. This document outlines the relevant specification and requirements for pre-burying communication cables in railway systems to ensure their successful integration into the overall infrastructure.

Scope and Application

This specification and requirement document applies to all communication cables used in pre- Buried Communication Cables (PBC) installations in railway systems. These cables include coaxial cable, fiber optic cable, and video cable, among others. The document provides detailed guidelines on the selection, installation, testing, and maintenance of PBCs to ensure they meet the specified performance criteria and safety standards.

Selection of Cable Types

1、Coaxial Cable

Coaxial cable is the most commonly used communication cable for railway applications due to its superior performance characteristics. When selecting coaxial cables for PBC installations, it is essential to consider factors such as frequency range, bandwidth, signal stability, immunity to interference, and cable thickness and diameter. Additionally, the cable should conform to relevant industry standards, such as IEC 60502, IEC 60503, and IEC 60998.

2、Fiber Optic Cable

Fiber optic cable is another popular choice for PBC installations due to its high data transmission rate, low latency, and excellent noise immunity. When selecting fiber optic cables for railway systems, it is important to consider factors such as wavelength length, core type (single-mode or multi-mode), fiber density, connector type, and cable protection features. The cable should also comply with relevant industry standards, such as ISO/IEEE 11801, ANSI/NFPA 1232, and EN 50674-1.

3、Video Cable

Video cable is specifically designed for transmitting high-quality video signals over long distances. When selecting video cables for PBC installations in railway systems, it is crucial to consider factors such as resolution, frame rate, bit rate, color depth, signal integrity, and compatibility with existing infrastructure. The video cable should also adhere to relevant industry standards, such as SMPTE ST 2110标准。

Installation Guidelines

1、Soil Testing

Before installing PBCs in the ground, it is important to conduct soil testing to determine the cable's potential path resistance and earthing capacity. Based on the test results, the appropriate grounding arrangement should be designed to ensure adequate current flow and prevent voltage drops across the cable conductors. This may involve installing underground electrodes or using surge protectors at terminations.

2、Installation Methodology

The installation methodology for PBCs should be carefully planned to ensure accurate positioning and secure attachment. Common installation methods include pit diggers (for coaxial cable), trenching (for both coaxial and fiber optic cables), and underground duct insertion (for video cables). The method selected should take into account factors such as ground conditions, cable length, complexity of the installation site, and local regulations.

3、Cable Protection Features

Cable protection features such as shielding, insulation coatings, and conduit protection barriers help minimize interference and protect the cable from environmental damage. When installing PBCs in railway systems, it is essential to follow industry guidelines on cable protection features to ensure optimal performance and safety.

Testing and Maintenance Procedures

1、Pre-Burial Testing

Prior to burial, all PBCs installed in railway systems should undergo pre-burial testing to verify their electrical continuity, signal quality, and performance under various operating conditions. This testing should be conducted by qualified personnel using specialized equipment according to relevant industry standards. Any damaged or non-functional cables should be repaired or replaced before burial.

2、Post-Burial Inspection and Maintenance

Regular post-burial inspections and maintenance are necessary to ensure the continued safe and reliable operation of PBCs in railway systems. Inspections may include visual inspections of the cables for signs of wear or damage

Articles related to the knowledge points of this article：

The Price of Mining Communication Cables

Title: DaQiang Communications Cable Factory: The Backbone of China’s Communications Infrastructure

The Cost of Communication Cables

Communication equipment room cable cutting and splicing steps

Title: Communication Cable Distribution Rack

Title: Communication and Power Cable Laying: A Comprehensive Guide