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GL-14 GLOSSARY
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GPP See general-purpose port.
half-duplex transmission A transmission system capable of carrying signals in both directions, but
in only one direction at a time.
handshaking A process that occurs after successful call setup but before actual data
transmission between two data devices to ascertain whether their data-
transmission parameters are set to permit successful data transmission.
handshaking logic A format used to initiate a data connection between two data module
devices.
hardwired Permanently connected via hardware.
HDLC See High-Level Data Link Control.
High-Level Data Link
Control (HDLC)
A standard bit-oriented protocol, developed by the International Standards
Organization (ISO), in which control information is always placed in the
same position and specific bit patterns used for control differ from those
used in representing data, so that errors are less likely to occur.
host computer A computer, connected to a network, that processes data from various
data-entry devices.
hybrid In the context of data processing, the ability to process both analog and
digital communications.
hybrid telephone A telephone with characteristics of both analog and digital telephones.
Also called hybrid voice terminal and nonanalog telephone.
hybrid voice terminal See hybrid telephone.
Ifield When used with the digital communications protocol (DCP), a channel
used for communicating digital information for voice and data.
inband signaling Signals transmitted within the same channel and frequency band used for
message traffic. See also robbed-bit signaling.
Information Systems
Network (ISN)
A wide area network (WAN) and local area network (LAN) with an open
architecture combining host computers, minicomputers, word processors,
storage devices, PCs, high-speed printers, and nonintelligent terminals into
a single packet-switching system.