Nortel Networks DCT1900 manual Error Handling, Board Controllers and Peripherals

Technical Product Manual - DCT1900

Maintenance, Test and Maintenance Software

SPC		DTC2
				Peripheral
P8
				P8
	BC	L2	L1
	Peripherals
BC				BC
	BC	L2	L1
SPC				Peripheral
P1
				P1
		DTC1
SPU Board	DTU Board			LTU Board
SPC			CLC	Base
				Station
8			8
BC	Peripherals
SPC
1		BC
CLC	Base
	Station
8
BC
CLC	Base		CLC	Base
				Station
	Station		1
1
SLU Board			CLU Board	Peripherals

Fig. 2–1 Board Controllers and Peripherals

2.2Error Handling

The T&M software in the CPU is activated either on detection of operational faults, or when a test has to be executed. A description of tests that T&M can perform is found in Section 2.3. This section deals with fault handling.

Operational faults and faults detected during tests will cause T&M to start up a fault handling procedure by which T&M tries to verify and clear the error. Figure 2–2 shows the different steps of the fault handling procedure. The two conditions for reception of a fault message cause the start of the flow.

All messages received by T&M are stored in either the Info or the Fault table. Not all messages that are received are faults. Some are of the category "information only". In this case, the message is logged in the "Info" table with the status code L (logged). In all other cases, a message will be written in the "Fault" table, with another status code. When the message deals with a persistent fault the following occurs:

2-2	Maint-DCT1900/R8/mw
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