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part of the terminal that contains the processing unit,
ROM, RAM, disk and diskette drives, and the I/O
channel.
T
terminal. In data communication, a device, usually
equipped with a keyboard and a display, that is capable
of sending and receiving information.
till. A tray in the cash drawer of the point-of-sale
terminal, used to keep the different denominations of
bills and coins separated and easily accessible.
transmit. To send information from one place for
reception elsewhere. (A)
twisted pair. A transmission medium that consists of
two insulated electrical conductors twisted together. (A)
typematic. The ability of a key on a keyboard to
repeatedly type a character as long as it is held down.
U
Universal Serial Bus (USB). A serial interface
standard for telephony and multimedia connections to
personal computers.
Universal Serial Bus (USB), powered. A
powered-USB connector provides additional power from
the host system. A powered-USB receptacle consists of
two connectors stacked vertically inside the common
housing. The upper connector contains four contacts
that are used for powering the attached device.
unshielded twisted pair (UTP). One or more twisted
pairs of copper wire in the unshielded voice-grade cable
commonly used to connect a telephone to its wall jack.
user. (1) A category of identification defined for file
access protection. (2) A person using a program or
system.
USB. See Universal Serial Bus.
V
version . A separately licensed program that usually
has significant new code or new function.
vital product data (VPD). Information about the
computer, such as machine type and model or serial
number, stored in the BIOS.
volatile memory. Memory that loses its contents when
power is turned off.
VPD. See vital product data.
83
Glossary
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