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Maintenance Object Repair Procedures
555-233-123 10-1030 Issue 4 May 2002
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
processor prior to any register access. There are two parts to the test. Part 1
involves navigating the Sanity Maze to toggle an unused lead. Part 2 attempts to
toggle an unused lead without first navigating the Sanity Maze. The Sanity Maze
test passes if Part 1 is successful and Part 2 fails.
Table 10-373. TEST #303 EPN Maintenance CP Sanity Maze Test
Error
Code Test
Result Description/Recommendation
1000 ABORT System resources required to run this test are not available.
2000 ABORT Response to the test request was not received within the
allowable time period.
2033 ABORT 1. Retry the command at 1-minute intervals a maximum of 5
times.
FAIL The Sanity Maze of the EPN Maintenance circuit pack is
defective.
1. Replace the EPN Maintenance circuit pack.
PASS The Sanity Maze is working properly, and the EPN
Maintenance circuit pack can access the unused register. If
recycle carrier commands (for EPN carriers) do not work, the
following problems may still exist:
1. The Carrier Port Power Unit or wiring to the Carrier Port
Power Unit may be defective. Refer to CARR-POW
(Carrier Port Power Unit) Maintenance documentation.
2. Since this test only tests the EPN, there is a very small
probability that the EPN Maintenance circuit pack cannot
access those registers that deal with EPN devices. The
EPN Maintenance circuit pack may need to be replaced.
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