Cisco Systems CISCO1841-HSEC/K9-RF manual Troubleshooting Cables, Connections, and Interface Cards

Chapter 8 Troubleshooting Cisco 1800 Series Routers (Modular)

Problem Solving

Environmental Reporting Features

If the router is operating at an abnormally high temperature, consider the following causes:

•Fan failure

•Air conditioner failure in the room

•Air blockage to cooling vents

Take steps to correct the problem. See the “Site Environment” section on page 3-4.

Troubleshooting Cables, Connections, and Interface Cards

Network problems can be caused by cables, cable connections, or interface cards, or by external devices such as a modem, transceiver, hub, wall jack, WAN interface, or terminal. Check for the following symptoms to help isolate the problem.

•Card is not recognized by the router.

–Make sure that the card is firmly seated in its slot.

–Check the LEDs on the card. Each card has its own set of LEDs.

–Make sure that you have a version of Cisco IOS software that supports the card.

•Card is recognized, but interface ports do not initialize.

–Make sure that the card is firmly seated in its slot.

–Check external cable connections.

–Make sure that you have a version of Cisco IOS software that supports the card. Check the software requirements for the affected card, which can be found in the configuration note for the card.

•Router does not boot properly, or constantly or intermittently reboots.

–Make sure that the card is firmly seated in its slot.

–Check the router chassis or software.

•Router boots, but the console screen is frozen.

–Check the external console connection.

–Verify that the parameters for your terminal are set as follows:

(a)The same data rate as configured for the router (9600 baud is the default)

(b)8 data bits

(c)1 stop bit

(d)No parity generated or checked

•Router powers on and boots only when a particular card is removed.

–Check the card. See the “Cisco One-Year Limited Hardware Warranty Terms” section on page 1-14and the “Obtaining Documentation and Submitting a Service Request” section on page 15 of the “Introduction to Cisco 1800 Series Routers (Modular) Hardware Documentation” document for warranty and customer service contact information.

•Router powers on and boots only when a particular cable is disconnected.

Cisco 1800 Series Routers (Modular) Hardware Installation Guide

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