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| Classification of communication cables |
If according to the type of cable, the communication cable is classified as follows:
1, single wire: refers to the original communication cable, single wire loop, with the earth as the regression line.
Symmetric cable: A loop is composed of two wires that are exactly the same under ideal conditions.
3, coaxial cable: in the same axis of the two conductors form a circuit, the outer conductor surrounded by the inner conductor, while the two are insulated.
According to the application, communication cables can be divided into the following three categories:
1, long-distance cable: long transmission distance, generally for reuse, most directly buried in the ground, in a few cases by overhead installation, or installed in the pipeline.
City cable: The number of wires in the cable is many. Generally installed in the pipeline, a small amount of local cable attached to the building or overhead installation.
3, local cable: mainly refers to the communication cable used in the telecommunications Bureau, generally installed on the wiring frame, but also installed in the cable slot; The local cable is used between the transmission equipment and the exchange equipment in the telecommunications Bureau, as well as the interior of other internal equipment. In order to prevent fire within the telecommunications Bureau, it is sometimes necessary to add flame retardant shields to the cable of the bureau.
According to the above classification method, communication cables can be symmetrical cables or coaxial cables.
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