Cisco 1721 - Manual (Page 58)

Chapter 3 Troubleshooting
Problem Solving
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Cisco 1721 Router Hardware Installation Guide
78-13834-02
Troubleshooting WICs and Cables
Use the show diag command to help determine problems with a card. Table 3-2
lists problems that could occur with WAN interface cards (WICs) and the possible
causes of these problems.
Table 3-1 OK LED Blinking Patterns
Number of Blinks Meaning
2 The 860P dual-port random-access memory (DPRAM) has
failed.
3 The parameter RAM area of the 860P DPRAM has failed.
4 The 860P 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 has failed.