DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127 Issue 1
August 1997
Maintenance Object Repair Procedures

Page10-788MAINT (EPN Maintenance Circuit Pack)

10
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 defecti ve.
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.
■In a switch without duplicated Expansion Links, current service is not
affected because the circuitry failing is not being used. Nevertheless,
a Minor alarm remains in the Alarm Log against MAI N T. Therefore, the
EPN Maintenance circuit pack must be replaced.
■In a switch with duplicated Expansion Links, service is not affected as
long as you DO NOT SWITCH LINKS; otherwise, the connection t o the
EPN Maintenance circuit pack is lost. Losing the EPN Maintenance
circuit pack connection means loss of the EPN Manager I (G1) or
G3MT and EPN Environment maintenance. If an Expansion Links
switch does occur, the software probably switches the links back,
based on the relative health of each link. The EPN Maintenance circuit
pack must be replaced to correct this problem.
PASS The on-board circuitry associated with both Expansion Interface circui t 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 ci rcui t
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 10-262. TEST #229 Serial Channel Local Loop Around Test — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page