Nortel Networks DCT1900 - Manual (Page 357)

Technical Product Manual - DCT1900
Maintenance, Test and Maintenance Software
Maint-DCT1900/R8/mw 2-7
© 2000-2005
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.
2.4 Resets
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:
z System is switched on.
z CPU reset button is pressed.
As a result a board power–on test is started by the entire system.