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Glossary-8
ter: Old French word for three.
Terminal Equipment: A computer running terminal software is used as terminal
equipment in modem connections.
Terminal program: A program which emulates the operation of a hardware terminal
on a computer's screen and keyboard.
Token: A token is a reencoding of information in less bits; basically an abbreviation.
Transfer mode: Data can be transferred either synchronouosly or asynchronously.
Transfer rate: The speed at which the data bits are effectively transferred.
UART: Universal Asynchronous Receiver and Transmitter; a special IC chip which
controls the serial port. Different models are available for PCs. Models with an in-
ternal buffer usually allow higher transfer rates.
V.: The ITU-TSS V.-standards describe data transfer via telephone lines.
Western jack: Telephone wall outlet connector used in the USA and other countries.
X.: The ITU-TSS X.-standards describe data transfer in public data networks.
XModem: A widely used, though somewhat aged, file transfer protocol. The use of
128 byte data blocks severely limits the achievable throughput.
XON/XOFF: Software flow control. The data flow is stopped by sending ASCII char-
acter Control-Q (dec. 17; hex $11) and restarted by Control-S (dec. 19; hex $13).
YModem: A file transfer protocol which uses data blocks of 1 Kbyte and transfers
filenames and more than one file in one transfer.
ZModem: A file transfer protocol with variable block size, reinitiation of aborted
transfers and transfer of several files in one transfer along with file (and path) names.