Nortel Networks DCT1900 manual Ack Test, 3 24-Hour Test, Resets, Reset Types

Technical Product Manual - DCT1900

Maintenance, Test and Maintenance Software

status AVE. Base Stations that are wired to the CLU/SLU and have power but have not been added to the system through the CSMW will get the status NEW. Erroneous boards or peripherals will get the status MFG.

Watch–dog Test

Board controllers have a watch–dog circuit which is periodically refreshed. The watch-dog circuit resets the controller when running in a loop. The watch–dog test is a test initiated by the CPU asking all controllers to test their watch–dog circuitry. The processor is forced to run in a loop, after which the watch–dog circuit should reset the processor again. The watch–dog on the CPU board is never tested.

2.3.2 Ack Test

The Ack test is a periodic test by which the CPU sends a message to all microprocessors in the system. Each processor shall respond with an acknowledgement. If a processor does not respond, an error is detected, and T&M will start a verification test. The test runs at a default setting every 2 minutes. The Ack test does not interfere with system service. By means of the CSMW software the periodic running of the Ack test can be stopped or started and the test interval time can be changed by selecting System-Configuration-Automatic System Test.

2.3.3 24–Hour Test

The 24–Hour (24–H) test is a periodic system test that runs once every 24 hours. The test is similar to the power–on test, but all tests run under supervision of the CPU (T&M) instead of the board controllers. Excluded from the 24–H test are boards or peripherals occupied in call handling. T&M will wait for them to become free, while prohibiting new involvement in calls. These circuits will get status Test Mode AwaiTing (TMT). Circuits that are free from call handling are blocked immediately. Circuits that are being tested will get status TME.

The system test reduces the system service noticeably. Boards or peripherals will be temporarily taken out of service during the test or while waiting to be tested. The test should therefore run after office hours. The default start time is 01:20 a.m. By means of the CSMW software, the start time can be changed, or the daily running of the 24 hour test can be stopped by selecting System- Configuration-Automatic System Test.

2.4Resets

In the DCT1900 system, different types of resets can be generated, each caused by different actions and with different results on reset counters and error tables. Table 2–1 shows the relation between action, reset type and result on counters.

2.4.1 Reset Types

CPU Power–on Reset

A CPU power–on reset is generated when:

zSystem is switched on.

zCPU reset button is pressed.

As a result a board power–on test is started by the entire system.

Maint-DCT1900/R8/mw	2-7
© 2000-2005