DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures

9-988MAINT (EPN Maintenance Circuit Pack)

9
Management Terminal Channel Local Loop-Around Test (#228)
This test is destructive.

This test checks TN775B on-board ci rcuitry associated with the ser ial link for the

management terminal connec tion. This test will not cause the local terminal log in

FAIL EPN Maintenance circuit pack did not respond to Sanity Handshake and the
test timed out.
1. Verify that the carrier A power units are good. If the -5 volt unit is
defective in the A carrier, then communication with the EPN Maintenance
circuit pac k will not be possib le.
2. If the -5 volt unit is good and this test continuously fails, background
maintenance will automatically escalate to an EPN Maintenance circuit
pack Reset (Test #306). Otherwise, manually invoke an EPN
Maintenance circuit pack Reset by issuing the test maintenance long
command and evaluating any generated error codes from Test #306. If
Test #306 passes, this test should also PASS. Use the following steps to
determine if the EPN Maintenance circuit pack, or the serial link to the
EPN Maintenance circuit pack, is defective:
Duplicated Port Network Connectivity:
1. Switch Port Network Connectivity by entering reset pnc interchange.
2. Run the Short Test S equence against the EPN Maintenance circuit pack.
If Test #106 still fails, replace the EPN Maintenance circuit pack and
retest. Otherwise, follow the error routines for any errors that are logged
by this Short Test.
Simplex Port Network Connectivity:
1. Replace the EPN Maintenance circuit pack and invoke the Short Test
Sequence against it.
2. If error persists, replace the EPN Expansion Interface circuit pack, at a
time when the EPN can go down with minimal inconvenience.
3. If the error still persists, the problem is with the actual serial link in A
carrier backplane and not with the EPN Maintenance circuit pack.
PASS The communications path to and from the EPN Maintenance circuit pack is
sane, and the EPN Maintenance circuit pack can read and rep ort the correct
EPN cabinet type. The EPN Maintenance circuit pack may still have
problems related to Tests #228, #229, #303, or #306.
Table 9-378. TEST #106 Sanity Handshake Test — Continued
Error
Code Test
Result Description/ Recommendation
Continued on next page