3Com 3C882 manual Symptom Possible Cause Solution, Do not remain Or application software or

	Evaluating Symptoms and Solutions		7-4
Table 7-1 Symptoms, Causes, and Solutions
Symptom	Possible Cause	Solution
B channel LED(s)	Problem with your computer	Carefully monitor the B1 and B2 LEDs
do not remain	or application software or	while attempting a call. These LEDs
green or amber	incompatible local or toll	flash during call establishment and
	telephone company.	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	There is an interoperability	Make sure that the local and remote
been established	mismatch between the local	data applications have
(B-1 or B-2 green	and remote applications.	communications capability and are
LED remains lit		properly configured.
and you receive a
CONNECT
message) but data
cannot be sent
Upon power up,	A previous firmware	Download the firmware. Refer to the
both the TEST and	download did not complete	Readme file for firmware download
D channel LEDs	successfully.	instructions.
flash.

Both B1 and B2 flash when the D channel lights

Cannot place or receive two simultaneous voice calls.

The 3C882 ISDN modem baud rate is set to 230.4 Kbps.

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.

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.