NEC SV8500 Operation And Maintenance Manual - page 79
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CHAPTER 1
General
The CPU transfers line/trunk card control information to the associated peripheral circuits via IO
Bus. When a party error is detected in the transfer data or when the required information cannot be
transferred from a circuit card, the CPU identifies the cause of the fault, changes over the CPU so
that system operation is not affected, and executes restart processing.
•
Speech Path Fault
The CPU monitors the operating status of the TSW card, the occurrence of errors in writing data to
the switch memory, and the basic clocks supplied to the speech path. Upon detecting a fault, the
CPU identifies the cause of the fault, determines whether the fault is temporary or permanent, and
executes required processing such as changeover of the TSW card.
•
Others
The alarm detecting circuit on the EMA card continuously monitors the occurrence of faults in the
PWR supply cards, such as abnormal status within the equipment frame, and lights the alarm lamp
on the front when a fault is detected.
(b) Lamp Indications on the Front Cover
When a fault occurs, the corresponding lamp on the front of EMA card indicates the location of the
fault.