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Appendix B Troubleshooting
This chapter is intended to help you troubleshoot problems you may encounter while setting up and
using the Modem. It also describes some common hardware and software problems and gives some
suggestions to troubleshoot them.
B.1 Diagnostics with the LEDs
Most hardware problems can be diagnosed and solved by checking the LEDs on the front panel of
your router.
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If the POWER LED is dark
- Make sure the power cord is firmly plugged into the back panel of the router and the other
end into an active AC wall or power strip outlet.
- Make sure the power switch is turned on.
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If the PC LED is dark
- Make sure your Ethernet cable is firmly plugged into the back panel of the router and the
other end into your computer or HUB.
- Make sure you using the correct Ethernet cable for your application.
- Make sure your Ethernet board is installed properly in your system by ping the IP address of
your PC.
B.2 Problems when configure the Modem via the console port
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Can’t see any message from the configuration screen
- Make sure the cable connection from the Modem’s console port to the computer being used as
a console is securely connected.
- Make sure the terminal emulation software is accessing the correct port on the computer
that’s being used as a console.
- Make sure that flow control on serial connections is turned off.
- Make sure the RS232 device attached to the console is configured as a ‘DTE’. If not, a
crossover or null modem adapter is required.
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Junk characters appear on the configuration screen
- Make sure the terminal emulation software is configured correctly. Check the baud rate and
data format is configured to 9600 bps, No parity, 8 data bits, and 1 stop bit.
B.3 Problems when connecting to the Modem via Ethernet
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Cannot connect your PC to the Modem for configuration via Ethernet.
- Make sure the PC LED is light
- Make sure the Modem’s IP address matches the IP address previously stored into the
Modem’s configuration. You must have previously set the Modem’s Ethernet IP address
and subnet mask, saved the Ethernet configuration changes, and rebooted the Modem for
the new IP address to take effect.
- Make sure the PC and the Modem are on the same IP subnetwork or the target router is
reachable through a router on your LAN.
- Make sure the TCP/IP properties setting is correct in your PC.
- Make sure if the TX and RX LED on the Modem’s front panel blinks when 'pinged'.
