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GL-22 GLOSSARY
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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
Control (SDLC)
A version of HDLC designed by IBM for use between their equipment.
synchronous data
transmission
A method of transmitting data in which discrete signal elements are
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
terminal (SMT)
An administration device for System 85 that is similar to the maintenance
and administration panel (MAAP). The SMT allows access to and the
ability to change the translation information associated with System 85
features.
System Network
Architecture (SNA)
An IBM communications architecture for distributed computer networks.
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 (TDM)
Multiplexing that divides a transmission channel into successive time
slots. See also multiplexing.