Nortel DMS 100 Series Maintenance Manual page 72

2-56 Maintenance overview
Exception data structure improvements
Modifications are made to the processing system data structure to support:
•
•
•
•
•
•
•
•
•
XPM exception use
In the XPM, exceptions indicate error conditions for faults that require service.
Exceptions also indicate normal non-error interrupts that indicate types of
work that the CPU must perform.
Examples of exceptions that are normal events follow:
•
•
•
•
•
•
Exceptions that are error conditions and that require service appear in the
following table.
Table 2-18 XPM error type and description (Sheet 1 of 2)
Type
1
2
3
297-8223-550 Standard 04.02 November 2000
a task to eliminate loss of trap data when multiple traps occur in a 10 s
period
accurate capture of trap-specific data
guaranteed survival of trap data over restarts and reloads
capture of both supervisor and user stacks at exception time
circular buffer management at exception time
enhanced trap administration functions
expanded trap-specific error information to accommodate parity fault
requirements
exception-processing system that reports parity faults to the parity audit
instead of the CC
save the trap system version for each trap
10 ms clock tick
message frame pulse
UART transmit and receive
trap instructions (software interrupt)
activity gain
reset
Fatal
No
No
No
Description
Value range error
Segment not present
Exit from uncalled procedure