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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Glossary and abbreviations
1659
time-division multiplex (TDM) bus
A bus that is time-shared regularly by preallocating short time slots to each transmitter. In a PBX, all port cir-
cuits are connected to the TDM bus, permitting any port to send a signal to any other port.
time-division multiplexing (TDM)
Multiplexing that divides a transmission channel into successive time slots. See also multiplexing
.
time interval
The period of time, either one hour or one-half hour, that BCMS measurements are collected for a reports.
time slice
See time interval
.
time slot
64 kbps of digital information structured as eight bits every 125 microseconds. In the switch, a time slot refers
to either a DS0 on a T1 or E1 facility or a 64-kbps unit on the TDM bus or fiber connection between port net-
works.
time slot sequence integrity
The situation whereby the N octets of a wideband call that are transmitted in one T1 or E1 frame arrive at the
output in the same order that they were introduced.
to control
An application can invoke Third Party Call Control capabilities using either an adjunct-control or
domain-control association.
to monitor
An application can receive event reports on an active-notification, adjunct-control, or domain-control associa-
tion.
TOD
Time of day
tone ringer
A device with a speaker, used in electronic voice terminals to alert the user.
TOP
Task-oriented protocol
trunk
A dedicated telecommunications channel between two communications systems or COs.
trunk allocation
The manner in which trunks are selected to form wideband channels.
trunk-data module
A device that connects off-premises private-line trunk facilities and DEFINITY ECS. The trunk-data module
converts between the RS-232C and the DCP, and can connect to DDD modems as the DCP member of a
modem pool.
trunk group
Telecommunications channels assigned as a group for certain functions that can be used interchangeably
between two communications systems or COs.
TSC
Technical Service Center
TTI
Terminal translation initialization