Nortel BCM 3.7, Manual

Page: 272 / 1004

272 Assigning Trunk/line data
N0008589 3.3
• A telephone can be administered to search automatically for an idle line from several lines that
appear on the telephone. Assign a line pool as the prime line (in
Line access ) and all the lines
in the line pool must appear on that telephone. When the user lifts the receiver or presses
Handsfree, any one of the lines, if idle, can be selected by Automatic Outgoing Line selection.
• Changes in the settings for trunk type on a system that is in use, can result in dropped calls.
• When assigning lines to line pools, consider your network configuration. You can create a
unified dialing plan by assigning lines to the same location to the same line pool on each of
your systems. For example, if system A and system B each have tie lines to system C, assign
the tie lines to pool D on each of the systems. You cannot assign target lines to a line pool, as
they are incoming-only.
Using loss packages
The Loss package settings allow you to select the appropriate loss/gain and impedance settings for
each line. The setting is based on the terminating switch type and the distance between Business
Communications Manager and the terminating switch.
When measuring the distance from Business Communications Manager to CO and from Business
Communications Manager to PBX system
s , use 600 ohms as the termination resistance setting.
A loss of 4 dB corresponds to a cable length of approximately 2700 m (9000 ft).
Table 42 Loss package settings
Loss
Package Receive
Loss Transmit
Loss
Impedance Distance to switch/cable loss/terminating switch
Short CO 0 dB 3 dB Short Short/<2 dB/Business Communications Manager to CO
Medium CO 0 dB 0 dB TIA/EIA 464 Medium/>2 dB and <6 dB/Business Communications
Manager to CO
Long CO -3 dB 0 dB TIA/EIA 464 Long/>6 dB/Business Communications Manager to CO
Short PBX 0 dB 0 dB Short Short/<2 dB/Business Communications Manager to PBX
Long PBX -3 dB 0 dB TIA/EIA 464 Long/>2 dB/Business Communications Manager to PBX