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.
