Nortel BCM 3.7 Manual page 934

934 T
TRO
The trunk route optimization MCDN feature allows the call to find the most direct route
through the private network to send a call between nodes. This function occurs during the
initial alerting phase of a call.
tromboning
Tromboning refers to the way a transferred call uses lines on a network. If TAT is not
present (no MCDN protocol is applied), a call made from a telephone on another system,
and then transferred from the telephone to a third telephone on the first system can
consume two network lines. By using TAT, the transferred call becomes an internal call
once it is transferred, freeing up the network lines.
trunk
The physical connection between the Business Communications Manager system and the
outside world using the public telephone system or another network system.
trunk answer
Use this feature to answer a call on any line that has an active Ringing service Service
Mode, when that line does not appear on your telephone. Enable Trunk Answer under
Ringing Service, Schedules, <schedule name>. (Services, Telephony Services, Scheduled
Services)
trunk anti-tromboning
See TAT.
trunk media bay modules
A computer module which provides access to telecommunications trunks.
• The digital trunk media bay module (DTM) provides the connection between a
standard digital PSTN T1 or PRI line and the Business Communications Manager
system.
• The Caller ID trunk media bay module (CTM)/Global analog trunk module (GATM)
provides the ability to access four (CTM/GATM4) or eight (CTM8/GATM8) analog
Caller ID PSTN lines. The 4X16 module combines a CTM and a DSM to support four
lines and 16 telephone connections on one module.
The GATM, connects to the lines through an amphenol connector rather than an RJ
connector like the CTM. The GATM also supports downloadable firmware (BCM 3.5
and newer software), depending on how the country DIP switches are set. Currently
the GATM is only supported in North America, Australia, United Kingdom and
Taiwan markets.
• The Basic Rate Interface media bay module (BRI) provides access to a maximum of
eight BRI ISDN telephone lines, two per loop. Each loop on the BRI can be
configured for either ISDN trunks or ISDN station devices.
trunk route optimization
See TRO.
N0008589 3.3