
A-5
Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
OL-23778-01
Appendix A Troubleshooting
Reading the LEDs
T1/E1 Interface LEDs
Table A-5
summarizes the LEDs on the T1/E1 interface (available only for A901-12C-FT-D and
A901-4C-FT-D).
SFP Ethernet Interface LEDs
Table A-6
gives information about the LEDs on the SFP interface.
RJ-45 Ethernet Interface LEDs
Table A-7
summarizes the LEDs on the RJ-45 Ethernet interface.
Table A-5
T1/E1 Port LEDs
LED
Color/State
Description (two LEDs for each T1/E1 port)
Active
(labeled C,
left LED)
Green
Carrier condition—operating without problem
Yellow
Loop condition
Off
Out of service or not configured
Alarm
(labeled AL,
right LED)
Yellow
Alarm condition
Off
No alarm
Table A-6
SFP LEDs
LED
Color/State
Description
SFP Link/Active
(labeled LINK ACT)
Orange
Link and active indicator
Off
Link not enabled
Table A-7
100/1000 Ethernet Port LEDs
LED
Color/State
Description (two LEDs for each 100/1000 Ethernet port)
100/1000
RJ-45 link
(labeled L,
left LED)
Solid Green
Link with no activity
Flash Green
Link with activity
Off
No link detected
100/1000
RJ-45 speed
(labeled S,
right LED)
Green
Speed 1000
Yellow
Speed 100
Off
Off