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Evaluating Symptoms and Solutions 7-4
B channel LED(s)
do not remain
green or amber
Problem with your computer
or application software or
incompatible local or toll
telephone company.
Carefully monitor the B1 and B2 LEDs
while attempting a call. These LEDs
flash during call establishment and
then remain green or amber once the
connection is established.
If neither LED flashes, ensure that
your computer is turned on and
operational, and that your application
software has sent an AT dial command
in the proper format.
There may be an incompatible local
or toll telephone company. Contact
your local telephone company and
have it verify that you can dial a data
call to the destination telephone
number.
A connection has
been established
(B-1 or B-2 green
LED remains lit
and you receive a
CONNECT
message) but data
cannot be sent
There is an interoperability
mismatch between the local
and remote applications.
Make sure that the local and remote
data applications have
communications capability and are
properly configured.
Upon power up,
both the TEST and
D channel LEDs
flash.
A previous firmware
download did not complete
successfully.
Download the firmware. Refer to the
Readme file for firmware download
instructions.
Both B1 and B2
flash when the
D channel lights
The 3C882 ISDN modem
baud rate is set to 230.4 Kbps.
Ensure that your computer’s COM port
supports 230.4 Kbps or change the
COM port setting of either your
computer or the ISDN modem so that
both devices are set to the same COM
port rate.
Cannot place or
receive two
simultaneous voice
calls.
Your ISDN line may only have
one telephone number. Your
ISDN line must have two
telephone numbers to allow
both analog phone ports to
be used simultaneously.
Check your ISDN line configuration. If
you have only one telephone number
you have to add a second telephone
number.
Table 7-1 Symptoms, Causes, and Solutions
Symptom Possible Cause Solution