Technical Product Manual - DCT1900Maintenance, Test and Maintenance SoftwareMaint-DCT1900/R8/mw 2-7© 2000-2005status AVE. Base Stations that are wired to the CLU/SLU and have power but have not beenadded to the system through the CSMW will get the status NEW. Erroneous boards or peripheralswill get the status MFG.Watch–dog TestBoard controllers have a watch–dog circuit which is periodically refreshed. The watch-dog circuitresets the controller when running in a loop. The watch–dog test is a test initiated by the CPUasking all controllers to test their watch–dog circuitry. The processor is forced to run in a loop, afterwhich the watch–dog circuit should reset the processor again. The watch–dog on the CPU boardis never tested.2.3.2 Ack TestThe Ack test is a periodic test by which the CPU sends a message to all microprocessors in thesystem. 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 2minutes. The Ack test does not interfere with system service. By means of the CSMW software theperiodic running of the Ack test can be stopped or started and the test interval time can bechanged by selecting System-Configuration-Automatic System Test.2.3.3 24–Hour TestThe 24–Hour (24–H) test is a periodic system test that runs once every 24 hours. The test issimilar to the power–on test, but all tests run under supervision of the CPU (T&M) instead of theboard 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 circuitswill get status Test Mode AwaiTing (TMT). Circuits that are free from call handling are blockedimmediately. Circuits that are being tested will get status TME.The system test reduces the system service noticeably. Boards or peripherals will be temporarilytaken out of service during the test or while waiting to be tested. The test should therefore run afteroffice hours. The default start time is 01:20 a.m. By means of the CSMW software, the start timecan be changed, or the daily running of the 24 hour test can be stopped by selecting System-Configuration-Automatic System Test.2.4 ResetsIn the DCT1900 system, different types of resets can be generated, each caused by differentactions and with different results on reset counters and error tables. Table 2–1 shows the relationbetween action, reset type and result on counters.2.4.1 Reset TypesCPU Power–on ResetA 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.
