Technical Product Manual - DCT1900Maintenance, Test and Maintenance Software2-2 Maint-DCT1900/R8/mw© 2000-2005Fig. 2–1 Board Controllers and Peripherals2.2 Error HandlingThe T&M software in the CPU is activated either on detection of operational faults, or when a testhas to be executed. A description of tests that T&M can perform is found in Section 2.3. Thissection deals with fault handling.Operational faults and faults detected during tests will cause T&M to start up a fault handlingprocedure by which T&M tries to verify and clear the error. Figure 2–2 shows the different steps ofthe fault handling procedure. The two conditions for reception of a fault message cause the start ofthe flow.All messages received by T&M are stored in either the Info or the Fault table. Not all messagesthat are received are faults. Some are of the category "information only". In this case, the messageis logged in the "Info" table with the status code L (logged). In all other cases, a message will bewritten in the "Fault" table, with another status code. When the message deals with a persistentfault the following occurs:SPCP8SPCP1SPU BoardBCL2DTC2DTU BoardL1L2 L1DTC1CLU BoardBCBCSPC8SPC1SLU BoardBCCLC8CLC1BCBaseStationCLC8CLC1BCBaseStationBaseStationBaseStationPeripheralsPeripheralsPeripheralP8PeripheralP1LTU BoardBCPeripherals
