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 p rocessor has direct ac cess to special
registers in the EPN Maintenance circuit p ack. These registers are tied to suc h
things as the Expansion Interface c ircuit pack reset lead s and Carrier Port Power
Unit reset leads (which enable the EPN Maintenance circuit pack to recycle
carriers). To prevent an insane EPN Maintenance circuit pac k from inadvertently
controlling these external d evices, a special inter face called the Sanity Maze is
provided that must first b e 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 dup licated Port Network Connectivity, current
service will not be affected because the circuitry failing is not being
used. Nevertheless, a Minor alar m will remain in the Alarm Log ag ainst
MAINT. Therefore, the EPN Maintenance circuit pack must be
replaced.
b. In a switch with d uplicated 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 circ uit pack
serial links is good. If ther e is still a problem co mmunicating with the EPN
Maintenance circuit pack, check the following:
1. The cable comprising the serial link (B carrier Expansion Interface c irc uit
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 Test
Result Description/ Recommendation
Continued on next page