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 |
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Number of Blinks | Meaning | |
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2 | The 860T dual-port random-access memory (DPRAM) failed. |
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3 | The parameter RAM area of the 860T DPRAM failed. |
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4 | The 860T system protection control register has a write failure. |
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5 | The router cannot detect the dynamic random-access memory (DRAM). |
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6 | The user programmable machine has a write failure. |
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9 | The router DRAM failed. | |
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Troubleshooting WAN Interface Cards and Cables
Use the show diag command to help determine problems with a card. Table 3-2lists problems that could occur with the WAN interface cards and the possible causes of these problems.
| | Cisco 1700 Router Hardware Installation Guide | | |
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| 78-5405-03 | | | 3-7 |
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