8-2 CHAPTER 8: TROUBLESHOOTING

Checking the Basics

Before you monitor the LEDs or refer to the section on symptoms and solutions, check the following:

■Verify that the cables are not physically damaged. If damage is apparent, replace the cable.

■Verify that the power cord is connected to an electrical outlet and the 3C882 ISDN modem.

■Verify that the ISDN cable is properly connected to the 3C882 ISDN modem and the ISDN wall jack.

■Verify that the 3C882 ISDN modem is connected to the proper COM port. Note that the DTR LED will indicate successful communication between your communications application and the 3C882 ISDN modem.

The 3C882 ISDN modem will not operate if connected to an analog telephone wall jack. Make sure that the 3C882 ISDN modem is connected directly into the ISDN wall outlet without connection to any intermediate telephone equipment (an NT1 device is not required with the 3C882 ISDN modem).

Monitoring LEDs

If you are experiencing operational inconsistencies, monitor the following LEDs to isolate problems.

Monitoring the TEST LED

Press the Reset button and observe the TEST LED. During power-up self-test, the TEST LED flashes.

■If the LED goes out after the test has been completed, the test has been successful.

■If the TEST LED flashes and remains on for more than a few minutes, there is an internal failure. Notify your reseller that the 3C882 ISDN modem has failed the self-test, and order a replacement.