DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-991MAINT (EPN Maintenance Circuit Pack)
9
EPN Maintenance Circuit Pack Sanity Maze Test
(#303)
The EPN Maintenance circuit pack processor has direct access to special
registers in the EPN Maintenance circuit pack. These registers are tied to such
things as the Expansion Interface circuit pack reset leads and Carrier Port Power
Unit reset leads (which enable the EPN Maintenance circuit pack to recycle
carriers). To prevent an insane EPN Maintenance circuit pack from inadvertently
controlling these external devices, a special interface called the Sanity Maze is
provided that must first be navigated by the EPN Maintenance circuit pack
FAIL The on-board circuitry associated with the Standby serial link is defective.
Since the EPN Maintenance circuit pack reported this failure, the on-board
circuitry associated with the Active serial link is functional.
1. This test checks the circuitry on the EPN Maintenance circuit pack
associated with the Standby Expansion Interface link.
a. In a switch without duplicated Port Network Connectivity, current
service will not be affected because the circuitry failing is not being
used. Nevertheless, a Minor alarm will remain in the Alarm Log against
MAINT. Therefore, the EPN Maintenance circuit pack must be
replaced.
b. In a switch with duplicated Port Network Connectivity, service will not
be affected as long as you DO NOT INTERCHANGE THE PNCS;
otherwise, the connection to the EPN Maintenance circuit pack will be
lost. Losing the EPN Maintenance circuit pack connection will mean
loss of the connection to the terminal and EPN Environment
maintenance. The EPN Maintenance circuit pack must be replaced to
correct this problem.
PASS The on-board circuitry associated with both Expansion Interface circuit pack
serial links is good. If there is still a problem communicating with the EPN
Maintenance circuit pack, check the following:
1. The cable comprising the serial link (B carrier Expansion Interface circuit
pack to EPN Maintenance circuit pack only) may be defective.
2. The EPN Maintenance circuit pack may actually be defective.
NOTE:
This test may not be 100 percent accurate.
3. The Expansion Interface circuit pack on the Standby link may be
defective.
Table 9-380. TEST #229 Serial Channel Local Looparound Test — Continued
Error
Code
Tes t
Result Description/ Recommendation
Continued on next page
