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  • UTP (Unshielded Twisted Pair)

    UTP (Unshielded Twisted Pair) is a regular copper wire that joins many home and many business computers to the telephone company. UTP is the most common form of twisted pair wiring, because it is less expensive and easier to work with than STP (Shielded Twisted Pair). It is used in Ethernet 10Base-T and 100Base-T networks as well as in home and office telephone wiring.

    Two insulated copper wires are twisted around each other to decrease crosstalk or electromagnetic induction between pairs of wires. The twist in UTP helps to reduce crosstalk interference between wire pairs. Every signal on a twisted pair involves both the wires. Twisted pair is often installed in two or more pairs, all within a single cable, to offer multiple connections to computers. A twisted pair enclosed in a shield, which operates as a ground, is known as shielded twisted pair (STP).

    Twisted pair is frequently linked with home usage. Whereas, an advanced grade of twisted pair is many a times used for horizontal wiring in LAN networks since it is less expensive than coaxial cable.

    UTP Cable Standards

    The following are a few UTP Cable standards used in the market:

    Cat 3 UTP

    Category 3 UTP is rated to carry data up to 10Mbit/s.

    Cat 3 UTP was the standard cable used with Ethernet 10Base-T.

    Cat 5 UTP

    Category 5 UTP is rated to carry Ethernet up to 100Mbit/s and ATM up to 155Mbit/s.

    Cat 5 UTP was the standard cable used with Ethernet 100Base-TX.

    Cat 5e UTP

    Category 5e UTP is an enhanced version of Cat 5 UTP.

    Cat 5e UTP is rated to carry data up to 1000Mbit/s.

    Cat 5e UTP is the standard cable used with Ethernet 1000Base-T.

    Cat 5e can also be used to extend the distance of 100Base-TX cable runs up to 350 meters.

    Cat 6 UTP

    Category 6 UTP is very similar to Cat 5 UTP, except that it is designed and manufactured to even stricter standards.

    UTP Termination

    Two-pair (four-wire) UTP used for telephone use is normally terminated in an RJ-11 connector.

    Four-pair (eight-wire) UTP used for data use is normally terminated in an RJ-45 connector.


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    1. shaban

      12 January, 2012 at 3:11 pm

      what is the main function of the unshilded twisted pair(UTP)

    2. Samuel Boateng

      3 June, 2011 at 6:01 pm

      thus for the T568b

      • Jodi

        17 November, 2011 at 4:23 am

        I want to know what are the virtue of UTP…

      • peace on earth

        24 March, 2012 at 9:21 pm

        Dear Mr.Samuel Boateng
        you inverted the UTP pinout assignment, since the T568A standard is WG,G,WO,Blue,WBlue,O,WBrown,Brown but the T568B standard is WO,O,WG,Blue,WBlue,G,WBrown,Brown

    3. hari om

      2 June, 2011 at 2:18 pm

      why the hell , the unshielded twisted pair called so, as it is already shielded or insulated

      • Will.Spencer

        30 March, 2012 at 6:12 am

        hari om:

        “Shielding”, in this context, refers to shielding against RF interference. Insulation doesn’t do that.

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