Network Router User Manual

Troubleshooting 3-3

Problems After Router is Running

Table 3-2 lists problems that could occur after the router has been up and running.

• Improperly connected

cable.

• To make sure that you have cabled properly, refer to Figure 2-5

in Chapter 2, “Installing the Cisco 805 Router.”

• Make sure the connectors at both ends of the cable are securely

seated.

• Improperly functioning

modem or channel

service unit/data

service unit

(CSU/DSU).

• Refer to the documentation that accompanies your modem or

CSU/DSU.

• Router improperly

configured as a DTE or

DCE.

• By default, the router is configured as a DTE. Check the

setting of the clock rate command to determine if it is set

properly. If a clock rate speed is not specified, the router is

configured as a DTE. If a clock rate speed is specified, the

router is configured as a DCE.

Table 3-2 Problems After Router is Running

Symptom Problem Solutions

Problems with Ethernet

connection. (The LINK LED on

the back panel is off.)

• A cable-related problem:

— Disconnected cable.

— Damaged cable.

Perform the following tasks in the following

order:

1 Make sure the connectors at both ends of the

cable are secure.

2 Make sure the cable is not physically damaged.

If it is damaged, order another cable from

Cisco or replace it with a similar cable.

Table 3-1 Problems During First Startup (continued)

Symptom Problem Solutions