Nortel North American DMS-100 Instruction Manual page 296

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DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Returning a busy D-channel to service
ISDN PRI primary and backup D-channels
Determine the state of the D-channel.
Note: The MAP display lists the state of the D-channel to the right side of
the DCHL header.
If
one D-channel is INS (in service) and the other is
STB (standby)
one D-channel is INB (installation busy) or MB (man-
ual busy), and the other is in a different out-of-ser-
vice state or INS
both D-channels are either INB or MB
Choose an INB or MB D-channel to restore. Record the channel identifier (D1
or D2).
Note 1: Do not choose an in-service (INS) or standby (STB) D-channel to
clear. An INS D-channel is a normal operation state for the primary
D-channel. An STB D-channel is a normal operation state for the backup
D-channel. The STB state occurs for a backup D-channel when the
primary D-channel is INS.
Note 2: You must use the same identifier (D1 or D2) for all procedures and
steps used to clear the chosen D-channel. The MAP display lists the
identifier under the LANG header.
Note 3: When both D-channels are out of service, restore each channel
separately. The first restored D-channel becomes the primary and is INS.
The second restored D-channel becomes the backup and is STB.
If the state of the D-channel
is INB
is MB
CAUTION
PRI service interruption
The following step takes an in-service D-channel out of
service. When you take an in-service D-channel out of
service, the backup D-channel automatically switches into
service.
To manually busy the D-channel, type
>BSY d_channel
and press the Enter key.
Do
step 10
step 6
step 6
Do
step 7
step 8
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(continued)