Telebit T3000 Reference Manual page 151

Placing a Call
Is the telephone line connected to the TO LINE connector on the
modem's back panel?
A common mistake is to connect the telephone line to the
TO PHONE connector, which is used for connecting a
telephone to the modem for voice communications.
Connect the telephone line to the TO LINE connector on
the modem's back panel. Optionally, connect a telephone
set to the TO PHONE connector.
Is the modem ready to accept commands or data from the DTE?
The MR (Modem Ready), DTR (Data Terminal Ready) and CTS
(Clear to Send) indicators should be lit.
The modem must be operational and able to communicate
with the DTE before placing a call.
Send a dialing command sequence to the modem from your
terminal or computer.
Be sure to include any required access codes and wait for
dial tone characters
(W)
in the dialing sequence. If your
call requires operator assistance, you can place a call
manually using your telephone set, then press the T/D
switch to cause the modem to go off-hook and listen for
the called modem's answer tones.
Did the modem go off-hook and begin the dialing sequence? You
should hear a brief dial tone followed by dialing sounds as the
modem places the call. The OH (Off-Hook) indicator should be lit.
If the OH indicator did not light, the modem probably did
not recognize the dial command.
Try
entering the
command again. Be sure to precede the command with an
AT prefix and follow the command with a carriage return.
Verify that the modem is properly configured to
communicate with your equipment.
7-8 Troubleshooting