3Com ISDN Modem, User Manual

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Evaluating Symptoms and Solutions 8-5
Calls cannot be
placed from analog
equipment If you cannot place a call,
there may be a problem with
the configuration of your ISDN
line.
Calls from an analog port may
be blocked.
Call the telephone company to 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 each port is
checked.
Attach a different telephone to the
analog port to verify if the problem is
with the analog device.
SPID 2 takes several
minutes to initialize The switch type has been
manually changed to
“unknown” (S50=0) but the
SPID fields have not been
cleared. If you change the switch to
“unknown”, clear the values in the
SPID fields by deleting the values
listed in S52 and S53. Use terminal
emulation software to enter the
commands
ATS52=
and
ATS54=
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.
Send the command
AT\S
and check
the cause code field.
(Continued)
Table 8-1 Symptoms, Causes, and Solutions
Symptom Possible Cause Solution