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Appendix A

Solving Problems


This chapter provides information on the more common problems you may encounter in using your GT 50 router. It includes the following topics:

Hardware Problems

Software Problems


Hardware Problems

Check the following table for the more common symptoms of hardware problems you may encounter with your GT 50 or with routers in general. The table identifies the symptom, possible cause(s), and the solution(s) to the problem.
Symptom Possible Cause(s) Solution
No LED or other activity.

1/0 switch is in the Off (0) position.

Power cord or power supply not properly seated.


Bad power supply, power cord, or connector.

GT 50 is not plugged into a power source.




Circuit power interrupted.

Switch to On (1).


Check all cords and the power supply for proper seating.

Replace any defective item.


Connect GT 50 to power supply and plug power supply into grounded power source and set power switch to 1 (ON).

Check outlet and circuit fuses or breakers.

Cannot access the GT 50 via the local network.

Incorrect cable.




Crossover switch is in the wrong position.

Replace with 10BaseT cable to connect to PC or hub.

Check Link LED.

Switch to correct position.

Cannot communicate from your GT 50 to another device via the local network.

Wrong cable


Loose connection



Crossover switch is in the wrong position.

Replace with the appropriate LAN cable.

Secure all connections.

Check Link LED.

Switch to correct position.

Cannot access a remote network or the Internet.

Wrong RS-232 cable type.


WAN interface connection is loose.

ISP service is down.


Gateway between GT 50 and the ISP is down.

Telephone lines are down.

Use an RS-232 straight- through cable.

Seat the WAN connection securely.

Try again later. Contact your ISP for status.

Try again later. Contact your ISP for status.

Check for active telephone service on line.

Software Problems

Check the following table for the more common symptoms of software problems you may encounter with your GT 50. The table identifies the symptom, possible cause(s), and the solution(s) to the problem.
Symptom Possible Cause(s) Solution
Cannot find a destination.

Wrong IP address.

Configure the correct address.

Cannot read a configuration.

Configuration not loaded in the GT 50.

Download the appropriate configuration file.

Cannot access the GT 50.

User does not have appropriate permission.

Check user's account and assign the required permission.

GT 50 is not receiving data.

Configuration settings are not compatible.

Verify that the settings are the same for both the source and destination routers.

Cannot access a remote network or the Internet.

Wrong IP address.


Incorrect network mask address.

No default gateway configured or incorrect default gateway address.

The DNS Server's IP address is either not configured or misconfigured.

Correct the IP address for the destination.

Correct the network mask address.

Configure a default gateway or correct the default gateway address.

Get the correct IP address for the DNS Server from your ISP. Configure this address on each station on your network.



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