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3-7
Cisco 1700 Router Hardware Installation Guide
78-5405-03
Chapter 3 Troubleshooting
• Power system—Check the external power source, power cable, router power
supply, and circuit breaker. Check for inadequate ventilation or air circulation
that might cause overheating.
• ISDN configuration—Consider ISDN-specific hardware and software
configurations (ISDN BRI WAN interface cards only).
OK LED Diagnostics
Use the front-panel OK LED to 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 patterns (described
in Table 3-1) depending on the problem. A pattern consists of 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 3-1 OK LED Blinking Patterns
Troubleshooting WAN Interface Cards and Cables
Use the show diag command to help determine problems with a card. Table 3-2
lists problems that could occur with the WAN interface cards and the possible
causes of these problems.
Number of Blinks Meaning
2 The 860T dual-port random-access memory (DPRAM) failed.
3 The parameter RAM area of the 860T DPRAM failed.
4 The 860T system protection control register has a write failure.
5 The router cannot detect the dynamic random-access memory (DRAM).
6 The user programmable machine has a write failure.
9 The router DRAM failed.