3.4 - Hierarchy of Errors and Alarms
Among the TSW200E1 test results, there are errors and alarms counters. To master the
equipment operation and to know what each counter really means, it is necessary to understand each
counter function and its hierarchy.
When there are higher priority alarms, the lower priority alarms are not displayed. This is
done to avoid counting the lower priority alarms that are caused by higher priority alarms. The
alarms are counted once each second whenever they are active, even if they do not happen for the
entire second. The errors are counted in absolute values of occurrence: each error is counted. The
exception is when a higher priority alarm becomes active, inhibiting the lower priority errors. For
example, the occurrence of FAS Error is inhibited by FAS Loss, AIS or No Signal, etc. The highest
priority alarm is the No Signal alarm.
The definition for each counter follows:
• BIT ERROR: The counter is incremented whenever a bit error is detected on the
received pattern.
• FAS ERROR:
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