Maintenance-Object Repair Procedures
555-233-143
8-1034 Issue 1 May 2002
PN Maintenance Circuit Pack Sanity Maze
Test (#303)
The processor on the PN’s Maintenance circuit pack has direct access to special
registers in the 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 PN’s Maintenance circuit pack to recycle carriers).
To prevent an insane 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 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 8-409. Test #303 PN’s Maintenance Circuit Pack Sanity Maze Test
Error
Code
Tes t
Result Description / Recommendation
1000 ABORT System resources required to run this test are not available.
2000 ABORT Response to the test was not received within the allowable time period.
2033 ABORT 1. Retry the command at 1-minute intervals up to 5 times.
FAIL The Sanity Maze of the PN’s Maintenance circuit pack is defective.
1. Replace the PN’s Maintenance circuit pack.
PASS The Sanity Maze is working properly, and the PN’s Maintenance circuit pack
can access the unused register. If recycle carrier commands (for PN 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. See ‘‘CARR-POW (Carrier Power Supply)’’ on page 8-393.
2. Since this test only tests the PN, there is a very small probability that the
PN’s Maintenance circuit pack cannot access those registers that deal with
PN devices. The Maintenance circuit pack may need to be replaced.
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