Juniper M120 - Unpacking the M120; Tools and Parts Required to Unpack the M120 Router; Unpacking the M120 Router

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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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Yellow alarm bit (X-bit) disagreements
Alarms, errors, and
events
T1 PIC ■ 113
T1 PIC