STRUCTURE AND APPLICATIONS OF TWISTED-PAIR CABLES

Structure

- Twisted-pair cables are a type of cable consisting of several pairs of copper wires twisted together to prevent electromagnetic interference from outside,

- If not twisted together, the signal will be in the same phase and the amplitude increases leading to noise.

- If twisted, the signal will be opposite to each other so the noise is suppressed.

- From the emission of UTP cables and crosstalk between adjacent pairs of cables.

- There are 2 types of twisted pair cables:

+ Shielded Twisted - Pair Cables with interference-proof - STP

+ Unshielded twisted-pair cables - UTP

* STP Cable (Shielded Twisted - Pair): Consists of several twisted pairs covered with an outer shell made of braided copper wire. This shell has the function of preventing external noise and preventing internal interference emission. This anti-jamming layer is grounded to escape interference. The theoretical speed is 500Mbps and in fact 155Mbps with a length of 100m. Use DIN (DB-9), using RJ45 connectors for these cables.

* UTP Cables (Unshielded Twisted - Pair): Consists of many twisted pairs like STP cables but they have no anti-interference sheath. The maximum length of the cable segment is 100 meters. Interference easily appears when these cables are placed near devices such as high voltage lines, cross-channel interference ... using RJ45 connectors for these cables.

Applications

Used to transmit signals at close distance, connected in LAN network between computers, computers with modules, switches ...