Computer cables are also called a twisted pair. In them, each conductor is wrapped in pvc isolation.
Telephone cables
Among the cables, two main types are distinguished for transmitting a telephone signal: TPPEP and TRV. The first is used almost everywhere, when it is planned to serve a large number of subscribers. The cable is represented by paired retinue wires. The second type is more often used to lay telephone lines in the interior. The strength of the shell is inferior to the TPPEP. The number of cores in the TRV is usually 2 pieces, but there are 4 residential subspecies. Operation of these cables is possible at a temperature of -10 ° to +40 °.