3Com Impact IQ 3C882 User Manual page 75

Table 7-1 Symptoms, Causes, and Solutions
Symptom Possible Cause
B channel LED(s) Problem with your computer
do not remain or application software or
green or amber incompatible local or toll
telephone company.
A connection has There is an interoperability
been established mismatch between the local
(B-1 or B-2 green and remote applications.
LED remains lit
and you receive a
CONNECT
message) but data
cannot be sent
Upon power up, A previous firmware
both the TEST and download did not complete
D channel LEDs successfully.
flash.
Both B1 and B2 The 3C882 ISDN modem
flash when the baud rate is set to 230.4 Kbps.
D channel lights
Cannot place or Your ISDN line may only have
receive two one telephone number. Your
simultaneous voice ISDN line must have two
calls. telephone numbers to allow
both analog phone ports to
be used simultaneously.
Evaluating Symptoms and Solutions
Solution
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.
Make sure that the local and remote
data applications have
communications capability and are
properly configured.
Download the firmware. Refer to the
Readme file for firmware download
instructions.
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.
Check your ISDN line configuration. If
you have only one telephone number
you have to add a second telephone
number.
7-4