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T1
TAAS
TABS
TAC
tandem switch
tandem through
tandem tie-trunk network
(TTTN)
TC
TCM
TDM
TDR
TEG
terminal
tie trunk
time-division multiplex
(TDM) bus
time-division
multiplexing (TDM)
time interval
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.
Trunk Answer from Any Station
Telemetry asynchronous block serial
Trunk-access code
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.
The switched connection of an incoming trunk to an outgoing trunk without human
intervention.
A private network that interconnects several customer switching systems.
Technical consultant
Traveling class mark
See
time-division multiplexing (TDM)
Time-of-day routing
Terminating extension group
A device that sends and receives data within a system. See also
terminal
on page 387.
A telecommunications channel that directly connects two private switching systems.
A bus that is time-shared regularly by preallocating short time slots to each
transmitter. In a PBX, all port circuits are connected to the TDM bus, permitting any
port to send a signal to any other port.
Multiplexing that divides a transmission channel into successive time slots. See also
multiplexing
on page 417.
The period of time, either one hour or one-half hour, that BCMS measurements are
collected for a reports.
on page 429.
Issue 1.0 May 2003
time interval
administration
429
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