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One tricolor per port:
■
Off—Not enabled
■
Green—Online with no alarms or failures
■
Amber—Online with alarms for remote failures
■
Red—Active with a local alarm; router has detected a failure
LEDs
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Alarm indication signal (AIS)
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Bipolar violations
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Excessive zeros
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Far-end block errors (FEBE, E-bit errors)
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Loss of frame (LOF), Loss of signal (LOS)
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Local and remote loopback diagnostics
■
Yellow alarm bit (X-bit) disagreements
Alarms, errors, and
events
E1 PIC ■ 35
E1 PIC