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Alarm indication signal (AIS)
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Remote defect indication (RDI)
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Loss of frame (LOF)
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Loss of signal (LOS)
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Bipolar violation (BPV)
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Excessive zero (EXZ)
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Line code violation (LCV)
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Error seconds (ES)
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Severely errored seconds (SES)
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Severely errored frames (SEF)
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Bit error event (BEE)
Alarms, errors, and
events
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Layer 2 per-queue and per-channel packet and byte counters
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24–hour history or error counter updated at 15–minute intervals
Instrumentation
(counters)
Channelized T1 IQ PIC ■ 47
Channelized T1 IQ PIC