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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-857MAINT (EPN Maintenance Circuit Pack)
10
MGR I Channel Local Loop Around Test (#228)
This test is destructive.
This test checks the on-board circuitry of the EPN Maintenance circuit pack
associated with the serial link for the terminal connection. This test does not
cause the terminal to become disconnected. However, any data being displayed
FAIL
(cont’d.)
2. If the -5 volt unit is good and this test continuously fails, background
maintenance automatically escalates to an EPN Maintenance circuit
pack Reset (Test #306). Otherwise, you can 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. Otherwise, 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 Expansion Links:
1. Determine which serial link is the standby by issuing the
status system system technician command.
2. Switch Expansion Links by entering set expansion-link
PCSS where PCSS is the 4-character Expansion Interface
circuit pack location for the Standby link.
3. Run the Short Test Sequence 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.
■ Single Expansion Interface Link Switch:
1. Replace the EPN Maintenance circuit pack and invoke the
Short Test Sequence.
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 report the
correct EPN cabinet type. The EPN Maintenance circuit pack may still have
problems related to Tests #228, #229, #303, or #306.
Table 10-241. TEST #106 Sanity Handshake Test — Continued
Error
Code
Test
Result Description/Recommendation
Continued on next page