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

GL-22GLOSSARY

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switch	Any kind of telephone switching system. See also communications
	system and ESS™.
synchronization	The process in which proper phase alignment to a transmitter is made so
	that the beginning and end of a character, message, time slot, or frame can
	be readily identified for information retrieval.
Synchronous Data Link	A version of HDLC designed by IBM for use between their equipment.
Control (SDLC)
synchronous data	A method of transmitting data in which discrete signal elements are
transmission	transmitted at a fixed and continuous rate. Synchronous data transmission
	requires that the timing of the transmission be synchronized between the
	sending and receiving devices. Also called synchronous transmission.
	See also asynchronous data transmission.
synchronous transmission	See synchronous data transmission.
system management	An administration device for System 85 that is similar to the maintenance
terminal (SMT)	and administration panel (MAAP). The SMT allows access to and the
	ability to change the translation information associated with System 85
	features.
System Network	An IBM communications architecture for distributed computer networks.
Architecture (SNA)
T1	A digital transmission standard that in North America carries traffic at the
	digital signal level-1 (DS1) rate of 1.544 Mbps.
T1 digital carrier	A type of digital transmission medium that transmits at 1.544 Mbps and is
	capable of carrying 24 channels.
tandem	The switched connection of an incoming trunk to an outgoing trunk.
TDM	See time division multiplexing or trunk data module. Both terms are
	abbreviated to TDM.
terminal dialing	A feature that allows a user to set up and take down data calls directly
	from the keyboard of a data terminal. Also called keyboard dialing.
terminal emulation	The imitation of all or part of one computer system by another, so that the
	imitating system accepts the same data, executes the same programs, and
	achieves the same results as the imitated system.
tie trunk	A dedicated telecommunications channel connecting two private
	communications systems. Also called automatic tie trunk.
time-division	Multiplexing that divides a transmission channel into successive time
multiplexing (TDM)	slots. See also multiplexing.