7-6 Netopia ISDN Modem User’s Guide
■If the D channel LED goes out, the ISDN modem is ready to
place and receive calls.
If you have a standard analog telephone attached to one of
the ISDN modem’s analog device ports, you can place a
voice call in the normal fashion. You should have the ability
to obtain a dial tone, enter digits, and connect to your des-
tination. While the voice call is being placed, either the B-1
or B-2 LED flashes yellow. Once the voice call is connected
and the other party picks up the phone, the B-1 or B-2 LED
that was flashing now remains lit until the call is discon-
nected.
If you do not hear a dial tone or cannot establish a call on
either telephone port, there is most likely a problem with
the configuration of your ISDN line or one of your two
B channels. Call the telephone company and have it verify
that you have been given the correct SPID and telephone
number and that your line is configured for circuit-switched
voice and data service.
6. Monitor the B-1 and B-2 LEDs.
Data calls typically involve more interactions than voice calls.
Your computer, applications software, or the remote destination
can prevent establishment of a data connection. If you are able
to establish a two B channel data connection, your Netopia
ISDN Modem is most likely functioning correctly.
■If you are unable to establish a data connection, carefully
monitor the B-1 and B-2 LEDs while attempting a data
connection. While establishing the data connection, the
B-1 and B-2 LEDs flash green. They then remain green
once the data connection is established.
■If neither of the B-1 or B-2 LEDs flashes green, check to
make sure that your computer is turned on and
operational, that your Netopia ISDN Modem cable is
properly connected and not damaged, and that your
application software has sent an AT dial command in the
proper format.