3
TROUBLESHOOTING
This chapter explains how to isolate and solve simple
problems encountered with the 3Com Impact digital
modem. Problems may stem from incorrect option settings
or improper installation. Follow the steps outlined in this
chapter.
There are no user-serviceable parts inside your 3Com Impact
digital modem. Unauthorized opening of the unit will void
the warranty.
Troubleshooting Tips
Before you call 3Com’s technical support organization for
assistance, check the following:
1 The power supply is connected and the power LED is on.
2 Turn the 3Com Impact digital modem power switch off
and then on again several times and observe the Test LED.
During power-up self-test, the Test LED flashes.
■ If the Test LED flashes and remains on for more than a few
minutes, there is an internal failure. Notify your reseller that
the 3Com Impact digital modem has failed the self-test, and
order a replacement.
■ If the LED goes off after the test has been completed, the
test has been successful.
3 Verify that the ISDN cable is connected to the digital
modem, and make sure it is connected to the ISDN wall
jack.
