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A-7
Cisco 3600 Series Routers Hardware Installation Guide
OL-2056-05
Appendix A Troubleshooting
Reading Front-Panel LEDs
Note Your router’s front or rear panel shows ACTIVE slot# and READY slot# LEDs corresponding to the
number of network module slots in the router. (See Table A-4.)
The Cisco 3620 router has two slots numbered 0 and 1; the Cisco 3640 router has four slots numbered
0, 1, 2, and 3; and the Cisco 3660 router has six slots numbered 1, 2, 3, 4, 5, and 6.
Note The Cisco 3660 router has PCMCIA slots located on its rear panel. (See Figure A-6.)
Front-Panel LEDs on Cisco 3631 Routers
The LEDs on the front panel of the router enable you to determine router performance and operation.
Figure A-4 shows the LEDs on the front panel of the Cisco 3631 router. For an explanation of these
LEDs see Table A-5.
Figure A-4 Cisco 3631 Front-Panel LEDs
Table A-4 ACTIVE, READY, and PCMCIA LEDs in Cisco 3620, Cisco 3640, and Cisco 3660 Routers
LED Description
ACTIVE 0, 1, 2, 3, 4, 5, 6 Blinks to indicate network activity on the module installed in the indicated
slot.
READY 0, 1, 2, 3, 4, 5, 6 Functional module has been installed in the indicated slot. If the LED is
off, the slot is empty or the module is not functional.
PCMCIA 0, 1 Data activity on the indicated PCMCIA slot.
SERIES
62575
Power LED Activity LED
SYS/RPS LED