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M/T-DIG (Maintenance/Test Digital Port)
Issue 1 June 2005 1717
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. These counters are used so that Control Channel Message Set (CCMS)
messages are not continuously sent uplink. Using this method, the message will be sent once,
when the counter reaches some preset threshold, and then not sent again until the counter is
cleared.
The ports on the Maintenance/Test circuit pack continually run self-tests, whenever the port is
idle. The Angel uses a counter so that the Background Maintenance Failure message is only
sent uplink once. This test is used to clear the counter, so that if the port continues to fail during
or after Communication Manager demanded testing, the Angel will send a message to indicate
that fact.
This test is only used to send a message to the Angel on the Maintenance/Test circuit pack.
Therefore, this test should never abort or fail.
Digital Port Sanity Test (#565)
This test verifies that the port circuitry involved in the digital trunk testing on the Maintenance/
Test digital port is functioning properly. This circuitry is common to both Maintenance/Test digital
ports on the Maintenance/Test circuit pack. Therefore, this test is only run for port 2. The test
aborts when it is run on port 3, as described in Table 636: Test #565 Digital Port Sanity Test
on
page 1718.
The Digital Port Sanity Test (#565) operates by connecting the two Maintenance/Test digital
ports on the TDM bus so that they talk and listen to each other. Four self-tests are attempted:
● sending data from port 2 to port 3 in asynchronous mode
● sending data from port 3 to port 2 in asynchronous mode
● sending data from port 2 to port 3 in synchronous mode
● sending data from port 3 to port 2 in synchronous mode
Table 635: Test #270 Clear Error Counters
Error
Code
Test
Result
Description / Recommendation
Any ABRT 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.