Juniper Networks Juniper M-series M10i - Manual (Page 12)

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)
■ Frame error
■ Line code violation
■ Local and remote loopback
■ Loss of signal (LOS)
■ Out of frame (OOF)
■ Yellow alarm
Alarms, errors, and
events
12 ■ ATM2 E3 IQ PIC
M10i Internet Router PIC Guide