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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Glossary and abbreviations
1658
system manager
A person responsible for specifying and administering features and services for a system.
system reload
A process that allows stored data to be written from a tape into the system memory (normally after a power
outage).
T
T1
A digital transmission standard that in North America carries traffic at the DS1 rate of 1.544 Mbps. A T1
facility is divided into 24 channels (DS0s) of 64 kbps. These 24 channels, with an overall digital rate of 1.536
Mbps, and an 8-kbps framing and synchronization channel make up the 1.544-Mbps transmission. When a
D-channel is present, it occupies channel 24. T1 facilities are also used in Japan and some Middle-Eastern
countries.
TAAS
Trunk Answer from Any Station
TABS
Telemetry asynchronous block serial
TAC
Trunk-access code
tandem switch
A switch within an electronic tandem network (ETN) that provides the logic to determine the best route for a
network call, possibly modifies the digits outpulsed, and allows or denies certain calls to certain users.
tandem through
The switched connection of an incoming trunk to an outgoing trunk without human intervention.
tandem tie-trunk network (TTTN)
A private network that interconnects several customer switching systems.
TC
Technical consultant
TCM
Traveling class mark
TDM
See time-division multiplexing (TDM).
TDR
Time-of-day routing
TEG
Terminating extension group
terminal
A device that sends and receives data within a system. See also administration terminal.
tie trunk
A telecommunications channel that directly connects two private switching systems.