Rate And Protocol Problems - AT&T DataPort PCX Modem User Manual

Troubleshooting
P: You are unable to log on to an online service.
S: Verify the character structure of the online service and
make appropriate changes in your software before dialing.
Some services, such as CompuServe
require a character format of 7E1 (7 data bits, even parity,
and 1 stop bit).
S: Configure the modem for 2400 bps (ATF5) with no error
control (AT\N0) and try to call again.

Rate and Protocol Problems

P: Your modem is configured to operate at its maximum
speed, but connects at a lower speed, such as
2400 bps.
S: With Automode enabled (ATF0), your modem will match its
dial-line rate and modulation scheme with the other
modem's dial-line rate. Therefore, if the other modem is
configured to operate at 2400 bps (V.22bis), the DataPort
PCX modem will connect at that rate. Ask the remote
modem's owner to determine the highest rate the remote
modem can support.
S: The DataPort PCX modem does not support other vendors'
proprietary systems and may be forced by the other modem
to connect at a lower rate.
P: Your modem is configured for V.17 fax (14,400 bps), but
faxes at a lower speed.
S: The other fax modem/fax machine may not support
V.17 fax.
S: Make sure that your fax software supports V.17 fax.
S: Make sure that 14,400 bps is selected as the send and
receive rate in your fax software.
P: Your modem never connects using V.42bis
compression.
S: Ensure that the software you are using supports RPI.
S: Ensure that V.42bis support is enabled in the software. In
QuickLink II Fax, use the Connection Setup window.
6-8
Issue 2 July 1995
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