Juniper Networks Juniper M-series M10i - Manual (Page 35)

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
■ Alarm indication signal (AIS)
■ Bipolar violations
■ Excessive zeros
■ Far-end block errors (FEBE, E-bit errors)
■ Loss of frame (LOF), Loss of signal (LOS)
■ Local and remote loopback diagnostics
■ Yellow alarm bit (X-bit) disagreements
Alarms, errors, and
events
E1 PIC ■ 35
E1 PIC