Status
Color
LED
Critical alarm - system-scope (including RP0).
Red
ALARM
Critical alarm - Relating to voltage rail failures.
Flashing Red
Major alarm - system-scope (including RP0).
Amber
Minor alarm - system-scope (including RP0).
Flashing Amber
No alarm.
Off
Time core is synchronized to an external source including IEEE1588.
Green
SYNC
System is in Synchronous Ethernet mode.
Flashing Green
Acquiring state or Holdover: Time core is in acquiring state or holdover
mode.
Amber
Time core clock synchronization is disabled or in free-running state.
Off
Secure Boot boot flash contents validation failed. (set by IOFPGA).
This case is only applicable immediately after power-on.
Flashing Red
ALARM (Both
LEDs)
GPS config and GPS port is down. Time-of-day (ToD), 1PPS, and 10
MHz ports are not provisioned or disabled.
Off
TIMING
ToD, 1PPS, and 10 MHz signals are not valid.
Amber
GPS port is up. ToD, 1PPS, and 10 MHz signals are valid.
Green
GNSS is not configured.
Off
GNSS
GNSS Normal State. Self-survey is complete.
Green
Power up. GNSS is not tracking any satellite.
Red
Auto holdover.
Amber
Learning state–normal. Self-survey is not completed.
Blinking Green
Fan Assembly LEDs
Cisco NCS 540 has 4 fans at the back panel. There is an LED on each fan assembly and they reflect the
different status of the fans.
Cisco NCS 540 Router Hardware Installation Guide
52
LEDs
Fan Assembly LEDs