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Trivial File Transfer Protocol (TFTP) A protocol similar to FTP that does not provide the security or error-checking features of FTP. See also File Transfer Protocol.

trunk lines The telephone lines that form the backbone of a telephone network for a company. These lines connect the telephone(s) to the telephone company and to the PSTN. See also Public Switched Telephone Network.

T-series connections A series of digital connections leased from the telephone company. Each T-series connection is rated with a number based on speed. T1 and T3 are the most popular.

TTL See Time to Live.

twisted-pair cable A type of network transmission medium that contains pairs of color-coded, insulated copper wires that are twisted around each other. A twisted-pair cable consists of one or more twisted pairs in a common jacket.

type A DOS command that displays the contents of a file. Also, short for data type.

UDP See User Datagram Protocol.

Uniform Resource Locator (URL) A URL is one way of identifying a document on the Internet. It consists of the protocol that is used to access the document and the domain name or IP address of the host that holds the document, for example,

uninterruptible power supply (UPS) A natural line conditioner that uses a battery and power inverter to run the computer equipment that plugs into it. The battery charger continuously charges the battery. The battery charger is the only thing that runs off line voltage. During a power problem, the battery charger stops operating, and the equipment continues to run off the battery.

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