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OK LED Diagnostics
Use the front-panel OK LED to help determine any problems with the router.
When the router first boots up, it performs a power-on self-test (POST). If the
router detects a problem during the POST, the OK LED blinks in a different
pattern (described in Table 1), depending on the problem. A pattern is a specific
number of blinks that is repeated until the router is turned off. If the router
experiences any of these problems, contact your Cisco reseller.
Table 1
Number of Blinks
2
3
4
5
6
9
78-6169-02
ISDN configuration—Consider ISDN-specific hardware and software
•
configurations (ISDN BRI WICs only).
OK LED Blinking Patterns
Meaning
The 860T dual-port RAM (DPRAM) failed.
The parameter RAM area of the 860T DPRAM failed.
The 860T system protection control register has a write
failure.
The router cannot detect the dynamic RAM (DRAM).
The user programmable machine has a write failure.
The router DRAM failed.
Cisco 1750 Router Hardware Installation Guide
Problem Solving
vii
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Table of Contents
Troubleshooting
