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Evaluating Symptoms and Solutions 7-3
Monitoring the B Channel LEDs
Attempt to place a call and observe the B channel LED(s). The
B1 and B2 LEDs flash amber for a voice call or green for a
data call during the call establishment phase. They then
remain continuously amber or green once the connection is
established. If they do not remain continuously amber or
green, refer to the “Evaluating Symptoms and Solutions”
section.
Evaluating Symptoms and Solutions
Table 7-1 lists symptoms of common problems, possible
causes, and possible solutions.
Table 7-1 Symptoms, Causes, and Solutions
Symptom Possible Cause Solution
TEST LED remains
lit for more than a
few minutes
An internal failure. Notify 3Com Technical Support that
the 3C882 ISDN modem has failed the
self-test.
D channel remains
lit for more than a
few minutes
Poor physical connection to
the local telephone company.
If the telephone wires at your site
appear to be satisfactory, call your
local telephone company for repair of
telephone company equipment and
troubleshooting assistance.
D channel
continues to flash
for more than a
few minutes
A mismatch between the
settings of the ISDN line and
the 3C882 ISDN modem
configuration.
Verify the telephone number and
SPID (if required). If the D channel
LED continues to flash, call your
telephone company to verify the SPID
and telephone number and ensure
that the telephone company has
configured the ISDN line properly
(refer to Appendix A).
Calls cannot be
placed from
analog equipment
If you cannot place a calls,
there may be a problem with
the configuration of your
ISDN line.
Calls from that analog port
may be blocked.
Call the telephone company and have
it verify that your line is configured
for circuit-switched voice and data
service.
From the Configuration dialog box,
check the Phone Port 1 and Phone
Port 2 boxes which are used for voice
call routing. Ensure that the correct
Phone Port box for that port is
checked.
(continued)