Appendix
Troubleshooting

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Data Communication Troubleshooting

You cannot hear the modem.

• Add M1L3 to the end of your Initialization String in the Modem Setup dialog.

When you type a character in the Terminal Window, it appears twice or not at all.

• MacComCenter Plus has its Local Echo feature turned on and the modem's echo feature is also turned on. If the system you are calling echoes your typed characters, turn off Local Echo in the Terminal Setup dialog.

Your modem or fax/modem disconnects while communicating remotely.

• If your connection is at 19200 bits per second or greater and hardware flow control is ON, ensure you have &D0 set in your initialization string.
• The other side has hung up.
• Your telephone line may have call waiting and a call has come in. It can be disabled in the Modem Setup dialog by putting the disable call waiting AT command in the Dial Prefix field. If this does not work, contact your local telephone company.
• Someone may be picking up an extension connected to the line your modem or fax/modem is using.

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Fax Troubleshooting

MacComCenter Plus is not able to connect or receive faxes from remote fax sources.

• Ensure the MacComCenter Manager is loaded and Fax Receiving is enabled.
• Your fax/modem may not be compatible with the specific brand of fax that you are connected with. Contact the modem manufacturer to determine if there is a known problem.
• Some fax machines cannot handle certain Fax IDs. For example, some fax machines require only numbers as the Fax ID, while others require only upper case or no spaces. Your Fax ID can be changed in the Fax Preferences dialog.

MacComCenter Plus connects to the remote fax machine, but none of the document pages are sent or are blank.

• If you have scheduled the fax to be sent, you may have deleted the fax document before it was sent.
• You may be trying to send a fax from the floppy disk. This is not recommended, since disk access times are longer when files are on the floppy drive. Copy the file to your hard disk and try again.

Faxes are being sent at a lower baud rate than the rated speed of the fax/modem or the specified maximum baud rate in the Port Settings dialog.

• Your fax/modem can't connect at the faster baud rate. This can be caused by poor line quality, speed limitations of the receiving fax machine, or a hardware incompatibility. This is not necessarily indicative of any problem with your fax/modem.

When you view a received fax, there appear to be missing lines, garbage, or "bar code".

• Your fax/modem may be incompatible with the sending hardware.
• There may have been a bad telephone connection for the call.
• Your fax modem may be improperly installed or damaged.

You wish to change the fax class used.

• This option can be changed on the Serial Port dialog. This dialog is accessed by selecting Preferences
  from the Edit menu in the main MacComCenter Plus application.

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Voice troubleshooting

Voice recordings sound garbled when played.

• Try recording your messages using a different input device.

MacComCenter Plus does not process incoming voice messages.

Ensure that the Fax/Voice option is enabled in the Telephony Control application, or that the Current Setting option on the Serial Ports dialog reads Fax/Voice.