User`s manual

U.S. Robotics I-modem Command Reference
Troubleshooting • Page 15-8
Bad faxes or canÕt fax
¥ Make sure the fax software is set to use Class 1 fax. Refer to your fax softwareÕs manual.
¥ If you use memory-resident programs (TSRs Ð Terminate and Stay Resident programs)
or disk-caching programs, they may be interfering. Try disabling them before you run
your com-muni-cations software.
Both devices exchange carrier signals, but fail to establish a communications link
¥ Make sure the I-modem is in the correct mode (fax or data), depending on whether the
connection is to be made with a facsimile device or a data device.
See Chapter 2, Modes of Operation
, for information on switching between Fax and Data
modes.
¥ Make sure the proper bit rate, word length, parity, and number of Stop bits have been
selected.
¥ Synchronous
operations: Review the instructions in Chapter 16, Analog Synchronous
Applications. If you've conÞgured the I-modem correctly, the problem may be with the
synchronous adapter or with the system you're trying to call.
¥ Send ATI4 and check to see that your modem is at the correct Bn setting to connect with
either an HST modem (B1 setting) or V.32terbo modem (B0 setting).