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Hardware Reference 19
C613-03087-00 Rev E
AR750S LEDs and what they mean
Functions of the AR750S LEDs are shown in the following table. Additional
LEDs may be present if a PIC is installed. Functions of PIC LEDs are described
in the Port Interface Card Hardware Reference.
LED State Function
Power/PWR Green The router is receiving power and the power switch is ON.
System/SYS Off Normal operation.
Amber Lit briefly during router startup, or the router is
malfunctioning.
Flashing
1 flash
3 flashes
6 flashes
There is a fault. To check the router’s fan speed,
temperature, and internal voltages, use the show system
command.
The router fan has failed.
There is an internal power supply fault in the router.
The router temperature is too high or too low. Put the
router in a location that will maintain an ambient
temperature range of 0 ºC to 50 ºC (32 ºF to 122 ºF), with
adequate airflow around the router and its vents.
PIC0
PIC1
Green A port interface card (PIC) is correctly installed and has
been detected by the router.
ETH0 / ETH1
L/A
Green The Eth port has a 100 Mbps link.
Amber The Eth port has a 10 Mbps link.
Flashing Data is being transmitted on the Eth port.
ETH0 / ETH1
D/C
Green The Eth port is operating at full duplex.
Amber The Eth port is operating at half duplex.
Amber
flashing
There is a collision on the Eth port.
PORT 1..5
L/A
Green The switch port has a 100 Mbps link.
Amber The switch port has a 10 Mbps link.
Flashing Data is being transmitted on the switch port.
PORT 1..5
D/C
Green The switch port is operating at full duplex.
Amber The switch port is operating at half duplex.
Amber
flashing
Collision on the switch port.