what is utp cable in networking

what is utp cable in networking

An UTP cable consists of four pairs of cables. The wiring standards specify the order in which the pairs are inserted into the RJ-45 connector. UTP cables can be categorized depending on whether the cable directly interconnects two computers or computers are connected through a hub. Among the 8 wires of UTP, only four wires are used for sending and receiving data. Figure shows the necessary four wires according to the pin number of the connector and their purposes, when the cable is connected to the computer and hub. When the cable is connected to the computer, wires connected to pin number 1 and 2 are used for sending data and wires 3 and 6 are used for receiving data. Whereas if the cable is connected to the hub, wires 3 and 6 are used for sending data and wires 1 and 2 are used receiving data.

• Straight-through cables connect two computers through a hub. One piece of cable connects a computer to the hub, and another connects other computer to the hub. The computer uses the wires 1 and 2 for sending data and the hub uses the same wires for receiving data and vice versa.

Note that if a straight-through cable is used to connect two computers directly, data will not sent or received.

• Cross-over cables are used to connect two computers directly without using a hub. The sending pair of one computer should be connected to the receiving pair of another computer and vice versa.

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