Nortel Meridian Meridian 1 Feature Description And Administration page 1266

Page 1266 of 1814
553-2901-301 Standard 9.00 January 2002
MSDL Idle Code Selection
The Idle Code Selection feature allows a Meridian 1, upon receiving a
"Yellow Alarm" condition from the remote end with a disabled T1 carrier, to
be configured to respond by sending an "Idle PCM" code instead of an
"Unassigned PCM" code. Therefore, a remote switch, such as a Lucent 5ESS,
which expects to receive an "Idle PCM" code can be cleared of a Red Alarm,
the Meridian 1 can be cleared of a Yellow Alarm, and trunks and channels can
be brought back into service.
The craftsperson should confirm that the remote end supports the "Idle PCM"
code, before configuring this feature on a loop.
The Idle Code Selection is an enhancement to the existing DTI (package 75)
and PRA (package 146) packages.
Figure 103 shows the existing operation, where the Meridian 1 responds to
the remote end only with an "Unassigned PCM" code. Figure 104 shows the
enhancement made by the Idle Code Selection feature, where the Meridian 1
responds with either the "Unassigned PCM" code or the "Idle PCM" code,
depending on how the loop has been configured, as described in
"Feature implementation" on page 1269.