Chapter 6 Troubleshooting; Troubleshooting Cables And Connections - Cisco CISCO1841 - 1841 Integrated Services Router Hardware Installation Manual

Chapter 6 Troubleshooting
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Troubleshooting Cables and Connections

Network problems can be caused by cables or cable connections, 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:
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If the router is operating at an abnormally high temperature, the following message is displayed on
the console screen:
%SYS-1-OVERTEMP: System detected OVERTEMPERATURE condition. Please resolve cooling
problem immediately!
Some causes of abnormally high router temperature are as follows:
Fan failure
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– Air conditioner failure in the room
– Blocked cooling vents
Take steps to correct the problem. Also see the
If the fan is not rotating at the desired speed, the following message is displayed on the console
screen:
%ENVMON-3-FAN_FAILED: Fan not rotating.
Make sure that the fan power cable is properly attached to the mainboard fan power connector. If the
problem persists, contact your technical support representative.
The interface ports do not initialize.
Check external cable connections.
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The router does not boot properly, or it constantly or intermittently reboots.
– Check the router chassis or software. See the
Terms" and the "Obtaining Documentation and Submitting a Service Request"
Preface for warranty and customer service contact information.
The router boots, but the console screen is frozen, it displays no output, or it displays garbled output.
Check the external console connection.
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Verify that the parameters for your terminal are set as follows:
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(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
The router powers on and boots only when a particular cable is disconnected.
There may be a problem with the module or cable. See the
–
Warranty Terms" and the
sections of the Preface
Cisco 1800 Series Integrated Services Routers (Fixed) Hardware Installation Guide
"Site Environment" section on page
"Cisco One-Year Limited Hardware Warranty
"Obtaining Documentation and Submitting a Service Request"
for warranty and customer service contact information.
Solving Problems
2-4.
sections of the
"Cisco One-Year Limited Hardware
6-3