Large number of communication cables

A large logarithmic communication cable is a collection of twisted pair cables integrated into a single outer sheath, used as the backbone or vertical subsystem of a network to transmit large amounts of data or voice signals. It uses chromatographic coding (such as white blue, white orange, etc.) to identify the line sequence and form the physical transmission channel of the main communication network.

The large number of pairs of communication cables refers to the integration of multiple pairs of mutually insulated wires (pairs ≥ 25) within a single cable, usually used for transmitting large amounts of voice and data signals in backbone communication networks.

Execution standard: YD/T322-1996

Basic unit: 25 pairs as a subunit, identified by chromatographic lines (main colors: white/red/black/yellow/purple; auxiliary colors: blue/orange/green/brown/gray).

Cable core structure: Multiple subunits are layered and twisted around a central reinforcement (such as steel wire/FRP), with an outer shielding layer (aluminum foil/copper wire weaving) and sheath.

Structural features:

The HYA type urban communication cable adopts full spectrum insulation, with aluminum-plastic composite sheath bonded together to form a sealed protective layer. The HYA type urban communication cable has the characteristics of good electrical performance and easy construction.

Protection level:

Flame retardant sheath meets GB/T 19666 flame retardant level C or above;

Moisture proof filling type (cable core filling grease) is suitable for humid environments.

Product Usage:

HYA type local telephone cable can be used in communication lines in towns, suburbs, and factories and mines.

Selection and laying points

Selection logic:

1. Select by logarithm:

Building vertical backbone: 50-200 pairs (covering 2-20 floors);

Main lines in the mining area: 200-600 pairs (connecting the ground and underground).

2. Enhance by scene:

Wet environment → Choose moisture resistant filling type (HYAC);

Mechanical damage risk zone → Armor type (such as HYA53 steel strip armor).

3. Installation requirements

Minimum bending radius ≥ 15 times the outer diameter of the cable (to avoid twisting deformation of wire pairs);

Stay away from power cables (parallel spacing ≥ 0.3m) to reduce electromagnetic interference.