Symptom Action
• PRI 000 PRI is responding
•
DTA 021 loss of frame alignment for 3
seconds
• DCH 1010 DCHI is software disabled
The system initializes and there are no active
B-channels.
When a PRI or ISL trunk interfaces with
another system and the system initializes,
you may have to disable and then re-enable
each B-channel.
D-channel problems
D-channel problems are indicated when the D-channel Handler Interface (DCHI) releases after
being enabled.
This applies to both primary and backup D-channels. For example:
Command Response Description
LD 96
ENL DCH N
DCH 1003 MDL error
DCH 1006 link establishment error
DCH RLS DCHI released
If these messages appear, follow the steps in Table 3: Procedure 3 D-channel status check on
page 21.
Table 3: Procedure 3 D-channel status check
Step Action Response
1 Check the status of the D-channel's PRI.
2 Clear any PRI problems.
3 Contact the far end. If the far-end D-channel is down, the
DCH1006 message is printed.
4 Test the DCHI using tests 100, 101, 200 and
201 (the tests must be run in sequential
order).
5 Print the protocol log using:
LD 96
D-channel problems
ISDN Primary Rate Interface Maintenance November 2011 21
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