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Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
Appendix A Troubleshooting
Reading Rear-Panel LEDs
Rear-Panel LEDs on Cisco 3660 Routers
For an explanation of the Cisco 3660 rear-panel LEDs, see:
• SYSTEM LED (see Table A-1)
• Power LED (see Table A-7)
• Fast Ethernet connector LEDs (see Table A-8)
• PCMCIA card LEDs (see Table A-4)
• Power supply LEDs (see Table A-3)
See Figure A-6 for the locations of these LEDs.
Note The system LED on the rear panel of the Cisco 3660 router has the same function as the system LED on
the front panel. (See Table A-1.)
The power LED communicates the status of the Cisco 3660 mainboard.
The LED on each Cisco 3660 router power supply has the same function as the PS1 and PS2 LEDs on
the Cisco 3660 router front panel. (See Table A-3.)
The PCMCIA LEDs on the Cisco 3660 router rear panel are the same as those on the Cisco 3620 and
Cisco 3640 router front panels. (See Table A-4.)
Figure A-6 Cisco 3660 Router Rear-Panel LEDs
Ta ble A- 7 Po we r LE D
Color Status
Green Operating voltages on the mainboard are within acceptable ranges.
Off An error condition is detected in the operating voltages.
E
N
E
T
H
0
E
T
H
3
E
T
H
E
R
N
E
T
4
E
E
T
H
2
E
T
H
1
1
2
3
A
C
T
L
I
N
K
0
VOICE
2V
V0
V1
EN
E
N
HIGH SPEED SERIAL
1HSSI
H
S
S
I 0
TD
TC
RD
RC
LB/CN
C
N
/
L
P
R
X
C
S
E
R
IA
L
3
S
E
R
IA
L
2
S
E
R
IA
L
1
S
E
R
IA
L
0
R
X
D
T
X
C
T
X
D
C
N
/
L
P
R
X
C
R
X
D
T
X
C
T
X
D
C
N
/
L
P
R
X
C
R
X
D
T
X
C
T
X
D
C
N
/
L
P
R
X
C
R
X
D
T
X
C
T
X
D
E
N
S
E
R
IA
L
4
T
S
E
E
M
A
N
U
A
L
B
E
F
O
R
E
I
N
S
T
A
L
L
A
T
I
O
N
V
I
C
F
X
S
IN USE
IN USE
1
0
17345
FDX
LINK
100Mbps
FDX
LINK
100Mbps
1
0
Power
supply LED
VCC OK
SYSTEM