AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual page 215

Glossary
synchronous data transmission
A method for continuous digital data stream in which the transmission of each
binary bit is synchronized with a master clock.
System Programming & Maintenance (SPM)
A DOS-or UNIX-based application for programming and maintaining the
communications system.
system renumbering
A process used to change the extension numbers assigned to telephones,
adjuncts, calling groups, paging groups, Call Park zones, and Remote
Access.
T1
A digital transmission carrier path that in North America transmits at the DS1
rate of 1.544 Mbps.
TDM
time-division multiplex
tie trunk
A private line directly connecting two communications systems.
time-division multiplexing (TDM)
A process where the transmission channel is divided.
tip/ring (T/R)
The contacts and associated conductors of a single-line telephone plug or
jack.
touch-tone receiver (TTR)
A device used to decode touch-tones dialed from single-line telephones or
Remote Access telephones.
T/R
See tip/ring (T/R).
uninterruptible power supply (UPS)
A device that connects to the communications system to provide 117 VAC to
the equipment when the commercial power source fails.
unit load
A measure of the power load drain of a module, telephone, or adjunct.
UPAM
Universal Paging Access Module
.
Glossary GL-13