Agilent Technologies Auroraduet N1726A, User Manual, Page: 366 / 507

Issue 01 - 06/99 7 - 59
Remote Control - Section 3
Ø Connect a normal telephone hand set to the line and
listen for a dial tone.
If you cannot hear a dial tone then there is a problem
with the phone line, not the modem.
Troubleshooting Problems Between the PC and
Modem
Problem : the modem does not respond to
any AT commands
Possible cause: you may be using the wrong COM port
or, if you are using an older modem,
there may be a speed mismatch.
Possible solutions :
Ø If you are using an external modem, check it is
hooked up to the correct COM port.
Ø Ensure you are addressing the correct COM port in
your communications software (for example, check
the
Port setting within Remote Control).
Ø If you have a card modem installed, check there are
no addressing or interrupt conflicts; for example,
both the mouse and the modem installed on the
same COM port.
Ø Check that the baud rate in your communications
software matches the modem's serial data rate. This
really only applies if you are using an older modem
as newer models 'auto detect' the serial port speed.
Ø Ensure the AT command is either all in
UPPERCASE or lowercase characters and not a
mixture of both.
Chap7s3.PM6 17/06/99, 09:52 59