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Monitoring LEDs 7-2
■ Verify that the ISDN cable is properly connected to the
3C882 ISDN modem and the ISDN wall jack.
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 TEST, D channel, and B channel 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.
Monitoring the D Channel LED
Observe the D channel LED. If you are connected to a live
digital ISDN line, the D channel LED remains lit for up to a
few minutes after the self-test and then begins to flash.
When the D channel LED flashes, it indicates that the ISDN
signal is present and it is attempting to synchronize with the
telephone company.
When the D channel LED goes out, it indicates that a valid
communication channel has been established and you can
place calls. If the D channel LED does not go out, refer to the
“Evaluating Symptoms and Solutions” section.