Processing facility alert and alarm indications for multiplexed transmission facilities having a plurality of multiplex levels
First Claim
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1. In a multi-level hierarchical alarm system, a method of reporting a specific alarm signal out of a plurality of alarm signals, comprising the steps of:
- for each specific alarm signal, performing timing using a timer corresponding to said each specific alarm signal;
if said specific alarm signal becomes active, freezing timing for all lower level alarm signals included in and below said specific alarm signal in a hierarchy of alarm signals;
if said specific alarm signal is absent, unfreezing timing for a lower level alarm indication included in said specific alarm signal; and
reporting said specific alarm signal if the timer corresponding to said specific alarm signal times out.
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Abstract
In large multi-tiered hierarchical alarm systems for high capacity telecommunications transmission systems, it is important to notify the maintenance craft of only the highest alarm, and to notify only when the alarm has been validated by persisting for a sufficiently long time. Advantageously, this is accomplished by timing alarms and freezing the timing when a higher level alarm is detected. If the higher level alarm is no longer present, timing on the lower level frozen alarm signal continues until there is a timeout. A timed out alarm is reported to the maintenance craft.
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10 Claims
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1. In a multi-level hierarchical alarm system, a method of reporting a specific alarm signal out of a plurality of alarm signals, comprising the steps of:
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for each specific alarm signal, performing timing using a timer corresponding to said each specific alarm signal; if said specific alarm signal becomes active, freezing timing for all lower level alarm signals included in and below said specific alarm signal in a hierarchy of alarm signals; if said specific alarm signal is absent, unfreezing timing for a lower level alarm indication included in said specific alarm signal; and reporting said specific alarm signal if the timer corresponding to said specific alarm signal times out. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification