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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 3 Troubleshooting PRE-1 Modules
Console Port Serial Connection Problems
Step 2 Check that the Ethernet port in question is assigned a valid IP address.
For more information about configuring Ethernet ports, refer to the Cisco uBR10012 Universal
Broadband Router Software Configuration Guide.
If the cable, connections, power, and configuration all check out, and you still cannot connect to the
Ethernet port on the module, replace the module in question. If the problem persists, contact the Cisco
TAC for further assistance. Refer to the “Obtaining Technical Assistance” section on page x for
instructions on contacting the Cisco TAC.
Console Port Serial Connection Problems
If the console screen connected to a Cisco uBR10012 console port appears frozen or fails to work
properly, check the following steps:
Step 1 Refer to the “Cisco uBR10012 System Startup Sequence” section on page 1-5. If the display stops
responding during this process, there is no console output.
Step 2 Check the console cable and make sure it is properly connected to the console port on the active PRE-1
module at one end and to your terminal equipment or terminal server at the other end.
Note You cannot connect to the console port on the standby PRE-1 module. You must connect to
the console port on the currently active PRE-1 module. If a switchover occurs, you must
switch the serial cable to the new active PRE-1 module to maintain the console connection.
Step 3 Verify that you are using the right type of cable and adapter. For information about pin-out connections
and installation instructions, refer to the Cisco uBR10012 Universal Broadband Router Hardware
Installation Guide.
Step 4 Make sure the cable is not defective or broken. Replace the cable with another high quality cable if
possible, and check to see if the console port starts working.
Step 5 Check that the terminal equipment is configured with the correct settings for the console port. The
default console port settings are:
• 9600 baud
• 8 data bits
• 1 stop bit
• No parity
• No flow control
Step 6 Check the LEDs on the PRE-1 faceplate to make sure it has powered up properly. If necessary, remove
and reinsert both PRE-1 modules to power them up again. Also, make sure the terminal equipment is
working properly.
Step 7 The console can appear frozen if the PRE-1 processor is busy performing other tasks, such as parsing a
large configuration file or passing a large burst of traffic. These periods are usually only temporary, and
normal reaction resumes after a few moments.