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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Glossary
Page GL-26
T
System
Programming and
Maintenance
See
SPM
.
system
renumbering
Procedure used to change the numbers assigned to
telephones, adjuncts,
calling group
s, paging groups, park
zones,
Remote Access
, and lines/trunks.
T1 Type of digital transmission facility that in North America
transmits at the
DS1
rate of 1.544 Mbps.
T1-emulated data A T1 tie trunk programmed for S56DATA for use by data
calls at speeds up to 56 kbps. These trunks may be used
for tandem and non-tandem operation.
T1-emulated voice A T1 tie trunk programmed for Tie-PBX or Tie-Toll for use
by voice calls.
T1 Switched 56
service
T1
digital data transmission over the
public network
or over
a
private network
at 56
kbps
. See
Switched 56 service
.
tandem switching The capability of
private network
communications systems
that allows them to direct outside calls from one facility to
another facility, rather than just to an extension. Calls may
be sent, for example, from a
PSTN
facility to a
tandem
trunk
or vice versa.
tandem trunk An private outside facility (as opposed to an inside system
line) that connects two communications systems in a
private network
and can carry calls to another outside
facility through
tandem switching
. The trunk is not
connected to the
PSTN
.
tandem tie trunk A
tandem trunk
that is an analog
delay-start tie trunk
,
providing a single line/trunk per facility and allowing
analog
transmission
of voice and low-speed data; or a T1 facility
offering 24 channels on emulated tie trunks and
programmed for voice or data.
tandem PRI trunk (tandem Primary Rate Interface trunk) A private network
trunk.
TAPI Telephony Application Programming Interface. An
application programming interface that allows computer
telephony applications to be used. TAPI is not yet
supported by the MERLIN LEGEND Communications
System. See also
TSAPI and CTI.
telephone power
supply unit
Equipment that provides power to an individual telephone.
terminal adapter See
ISDN terminal adapter
.
tie trunk Private trunk directly connecting two telephone switches.
timed flash See
switchhook flash
.