Nortel North American DMS-100 Instruction Manual page 293

1-278 Trouble locating and clearing procedures (continued)
Returning a busy D-channel to service
ISDN PRI primary and backup D-channels
Application
Use this procedure to return a busy D-channel to service.
Definition
The D-channel is in
•
•
The PRI trunk is D-channel manual busy (DMB). A DMB PRI trunk indicates
the manual removal from service of the D-channel associated with the trunk
group. Trunk group members associated with the out-of-service D-channel
remain DMB until the restoration of the D-channel. Only members that are
INB do not remain DMB until the restoration of the D-channel. Logs
ISDN111, ISDN112, or ISDN114 can generate.
An out-of-service D-channel addresses problem conditions. Normal activity
continues on an in-service D-channel. In this event, you perform a procedure
that clears problems on the out-of-service D-channel only. Both D-channels
can be out of service. Perform a procedure that clears problems for each
D-channel. Start with the condition that affects service the most severely. The
first restored D-channel becomes the primary D-channel and is in service
(INS). The second restored D-channel becomes the backup D-channel and is
standby (STB).
Common procedures
There are no common procedures.
Action
This procedure contains a summary flowchart and a list of steps. Use the
flowchart to review the procedure. Follow the steps to perform the procedure.
297-8021-544 Standard 14.02 May 2001
the installation busy (INB) state. This state indicates an installed
D-channel that is not in service
the manual-busy (MB) state. This state indicates the manual removal of the
D-channel from service