Toshiba U200 user manual Modem, Carrier

Troubleshooting

Modem

Refer to Appendix C, AT Commands and Appendix D, S-registers.

Problem	Procedure
Communication	Make sure the computer’s internal modem
software can’t initialize	settings are correct. Refer to Phone and Modem
modem	Properties in the Control Panel.
You can hear a dial	If the call is going through a PBX machine, make
tone but can’t make a	sure the communication application’s tone dial
call	detection feature is disabled.
	You can also use the ATX command. Refer to
	Appendix C, AT Commands.

You place a call, but a connection can’t be made

Make sure the settings are correct in your communications application.

After making a call you can’t hear a ring

Make sure the tone or pulse selection in your communications application is set correctly.

You can also use the ATD command. Refer to Appendix C, AT Commands.

Communication is cut	The computer will automatically cut off
off unexpectedly	communication when connection with the carrier
	is not successful for a set time interval. Try
	lengthening this time interval.

A CONNECT display is quickly replaced by NO

CARRIER

Check the error control setting in your communications application.

You can also use the AT\N command. Refer to Appendix C, AT Commands.

Character display	In data transmission, make sure the parity bit and
becomes garbled	stop bit settings correspond with those of the
during a	remote computer.
communication	Check the flow control and communication
session
	protocol.
You cannot receive an	Check the rings before auto answer setting in
incoming call	your communications application.
	You can also use the ATS0 command. Refer to
	Appendix D, S-registers.
	If problems persist, contact your dealer.

9-18 User’s Manual