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Chapter 4

Solving Problems


This chapter provides information on the more common problems you may encounter in using your GTX Series 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 router or with routers in general. The table identifies the symptom, possible cause(s) of the symptom, and the solution(s) to the problem
Symptom Possible Cause(s) Solution(s)
No LED, console, or other activity.

Power cord or power supply not properly seated.

Bad power supply, power cord, or connector.

Router is not plugged into a power source.



Circuit power interrupted.

Check all cords and power supply for proper seating.


Replace any defective item.

Plug your router into a grounded power outlet and make sure the Power switch is On.

Check outlet and circuit fuses or breakers.

Cannot access the
router.

Incorrect console cable.

Replace with null modem cable or equivalent.

Cannot communicate from your router to another device.

Wrong cable




Loose connection

Check the Part Number
(P/N) on the cable (if there is one) and use the appropriate cable.

Secure all connections.

Cannot access a remote network or the Internet.

WAN interface connection is loose.

ISP service is down.


Gateway between the router and the ISP is down.

Telephone lines are down.

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 router. The table identifies the symptom, possible cause(s) of the symptom, and the solution(s) to the problem.
Symptom Possible Cause(s) Solution(s)
Cannot find a destination.

Wrong IP address.

Configure the correct address.

Cannot read a configuration.

Configuration not loaded in the router.

Download the appropriate configuration file.

Cannot access the

router.

Incorrect Terminal program settings.


User does not have appropriate permission.

Configure using 9600 baud, 8 bits, No Parity, 1 Stop bit, No flow control.

Check user's account and assign the required permission.

router is not receiving data.

RIP is not enabled.

Enable RIP.

Data-link protocols are not compatible.

Check that the same protocol is configured on the source and destination routers.

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.

Correct the IP address for the destination.

Incorrect network mask address.

Correct the network mask address.

No default gateway configured or incorrect default gateway address.

Configure a default gateway or correct the default gateway address.



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