M/T-PKT (Maintenance/Test Packet Bus Port)
Issue 1 May 2002
8-851555-233-142
System Technician-Demanded Tests:
Descriptions and Error Codes
Always investigate tests in the order presented in the following table when
inspecting errors in the system.
Clear Error Counters (#270)
This test is not an actual test in the strict sense of the word. Many circuit packs
have counters in the Angel firmware. The circuit pack’s Angel continuously runs
port self-tests on idle ports and keeps track of any errors it detects by
incrementing a firmware counter. When the counter value reaches some preset
threshold, the Angel sends a single CCMS (Control Channel Message Set) error
message uplink to the SPE. No more error messages of that type are sent uplink
until the SPE sends a downlink message to clear the counter. This strategy keeps
a failed port/circuit pack from flooding the SPE with a continuous string of identical
error messages). This test is used to clear the counter, so that if the port
continues to fail during or after SPE-demanded testing, the Angel will send a
message to indicate that fact.
This test is only used to send a downlink message to the Angel on the
Maintenance/Test circuit pack. Since the Angel normally provides no uplink
response to this message, this test should never abort or fail.
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1. D = Destructive, ND = Nondestructive
Packet Bus Port Health Inquiry test (#567) X X ND
Clear Error Counters (#270) X ND
Table 8-362. Test #270 Clear Error Counters
Error
Code Test Result Description / Recommendation
Any ABORT This test should never abort.
Any FAIL This test should never fail.
1. Retry the command at 1-minute intervals up to 5 times.
2. If the test continues to fail, escalate the problem.
PASS The message to clear the Maintenance/Test circuit pack’s counter for
Background Maintenance Failures has been sent.
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