The telephone cable is the entry line of the telephone, which is connected to the telephone before making a call.
It is divided into 2 cores and 4 cores. Conductor materials are divided into three types: copper-clad steel, copper-clad aluminum and pure copper. Pure copper conductors have the best performance. Insulation material is high-density polyethylene or polypropylene, according to the national standard chromatogram to indicate the color of the insulating wire. Pairs of insulation: twist a single insulation into pairs according to different pitches, and use the specified chromatographic combination to identify the wire pairs, which reduces the mutual interference and crosstalk between the leads and reduces the power consumption.
Application of telephone cables
Communication engineering wiring, connection between indoor telephone communication cable system wiring, trunk line between voice communication systems, program-controlled exchange, telephone.
Specifications of telephone cables
The common specifications of telephone cables are two-core and four-core, with wire diameters of 0.4mm and 0.5mm, respectively, and 0.8mm and 1.0mm in some areas. In addition to two cores and four cores, there are four, six, eight and ten cores. If the general household is using the city mode, 2 cores are enough. If it is used by a company or some PBX, considering the need for broadband use of the telephone, it is recommended to use a 4-core telephone cable. If a digital phone is used, it is recommended to use a 6-core telephone cable.
Common conductor materials
1. Copper clad steel
This kind of wire is relatively hard and is not suitable for external pulling, which is easy to break the core. But it can still be used when buried in the wall. And can only be used for short distance use, (such as corridor junction box to user)
2. Copper clad aluminum
This kind of wire is relatively soft, and it is easier to break the core. It can be buried in the wall, or it can be pulled outside the wall. And can only be used for short distance use, (such as corridor junction box to user)
3. Pure copper
This kind of wire is soft and can be buried in the wall or pulled outside the wall. Can be used for long-distance transmission.
