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template A set of guidelines that you can apply to every new user account created.

terminal emulator A program that enables a PC to act as a terminal for a mainframe or a Unix system.

terminator A device that prevents a signal from bouncing off the end of the network cable, which would cause interference with other signals.

test accounts An account set up by an administrator to confirm the basic functionality of a newly installed application, for example. The test account has equal rights to accounts that will use the new functionality. It is important to use test accounts instead of administrator accounts to test new functionality. If an administrator account is used, problems related to user rights may not manifest themselves because administrator accounts typically have full rights to all network resources.

TFTP See Trivial File Transfer Protocol.

Thick Ethernet (Thicknet) A type of Ethernet that uses thick coaxial cable and supports a maximum transmissions distance of 500 meters. Also called 10Base5.

Thin Ethernet (Thinnet) A type of Ethernet that uses RG-58 cable and 10Base2.

Time Division Multiple Access (TDMA) A method to divide individual channels in broadband communications into separate time slots, allowing more data to be carried at the same time. It is also possible to use TDMA in baseband communications.

time-domain reflectometer (TDR) A tool that sends out a signal and measures how much time it takes to return. It is used to find short or open circuits. Also called a cable tester.

Time to Live (TTL) A field in IP packets that indicates how many routers the packet can still cross (hops it can still make) before it is discarded. TTL is also used in ARP tables to indicate how long an entry should remain in the table.

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