RJ-45 LEDs
Each RJ-45 port has two LED indicators. Left LED indicates the Link status; right LED indicates the status
of the duplex LED.
Table 19: RJ-45 LED Indication
Indication
LED State
LED
Link up in 10/100/1000Base-T
Green
Left
Activity in 10/100/1000Base-T
Blinking
Green
Fault/Error/Link down
Yellow
Administratively down
Off
Link up in full duplex
Green
Right
Link up in half duplex
Off
Power Supply Unit LEDs
Each power supply unit has a corresponding LED on the front panel.
Table 20: PSU LED Indication
Indication
LED
State
LED
Power Supply is working and 12V output is alright.
Green
OK
12V output failure (Either input not present or fault in the power supply unit).
Red
System–Interface LED Behavior
Table 21: 1G Copper and 1G SFP LED Indication
1G SFP Port LEDs
1G Copper Port LEDs (Link/Duplex)
Event
Off
Off/Off
ROMMON
Off
Off/Off
IOS Shut
Yellow
Yellow/Off
IOS No shut (cable disconnect)
Off
Green/Green
IOS No shut (cable connect) (media-type RJ-45)
Green
Off/Off
IOS No shut (cable connect) (media-type SFP)
Green
Off/Off
IOS No shut (cable connect) (media-type auto)
Cisco ASR-920-20SZ-M Aggregation Services Router Hardware Installation Guide
72
Troubleshooting Aids
RJ-45 LEDs