AT&T 2500 series, 7500 series, 7100 series, 7200 series, 7400 series, 7300 series manual Hdlc

GL-14GLOSSARY

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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	A standard bit-oriented protocol, developed by the International Standards
Control (HDLC)	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	A wide area network (WAN) and local area network (LAN) with an open
Network (ISN)	architecture combining host computers, minicomputers, word processors,
	storage devices, PCs, high-speed printers, and nonintelligent terminals into
	a single packet-switching system.