Nortel Networks DCT1900 - Manual (Page 355)

Technical Product Manual - DCT1900
Maintenance, Test and Maintenance Software
Maint-DCT1900/R8/mw 2-5
© 2000-2005
2.2.3 Maintenance
If the fault counter does not exceed its limits, T&M will now try to correct the error by resetting the
circuit or board. This is called a T&M reset. This reset causes the circuit or board to start a self
test. When the fault is cleared after this, the fault is intermittent. T&M will release the circuit by
changing its state to AVE. In the Fault Table the fault message will be completed with the status
code R (released).
When the fault returns after the self test, the fault is persistent. T&M will take the circuit out of
service by changing its state to malfunctioning, MFG, and raise an alarm. This alarm is called a
general alarm. A general alarm will cause the following:
z The general alarm relay on the MCCB is activated.
z An alarm message is sent to the MS (Mobility only).
z A "system service required" window appears on the PC screen when the CSM software is
running.
z A fault report is written in the service table.
z The fault message in the fault table is completed with the status code S (service).
z The faulty circuit or board is set to MFG.
It should be noted that service is only required when a general alarm occurs. For those faults
where a message is only written into the info and fault tables, no service is required because the
system is not malfunctioning yet. The service table can be read out by executing the Select File -
Create Service Report command. The error message in the table indicates the fault code, the
malfunctioning board or circuit, its position in the system and a time–and–date stamp.
2.2.4 Error Tables
The three different error tables, as indicated above are:
z Info table
z Fault table
z Service table
All tables have a size of 40 messages each. The info and fault table are cyclic buffers. The buffer
always holds the last 40 messages. These two tables may never be cleared, except by a CPU
reset or a system power down.
The service table is a non–cyclic buffer. This means that when full, new error messages will not be
logged. All service tables may be cleared by accessing the Clear Service Message command
under System on the CSMW menu bar.
All tables can be displayed by the Distributor–Diagnostics–Info–Error tables menu of the CSMW
software.