AT&T DataPort PCX Modem User Manual page 62

Communications and Fax Software Settings
For an external modem, if your serial port is configured
for 38,400 bps or higher and you notice errors in your
data transmission, try configuring it to 19,200 bps. Before
using higher data rates again, verify that your serial port
has a 16550A compatible UART that can handle
38,400 bps or higher.
For an internal modem in an 8-bit slot, do not attempt
DTE rates higher than 19,200 bps. An internal modem in
a 16-bit slot supports higher rates.
G
Your DataPort PCX modem supports Class 1 fax. If the
DataPort PCX modem is not listed in your fax software
setup, use a generic Class 1 fax driver, if available.
G
If no DataPort PCX modem driver is listed in your
communications software package, select any
Hayes-compatible modem. This selection will not affect
your data rate.
G
Use Hardware flow control (RTS/CTS) if possible. This is
the recommended flow control method, and the DataPort
PCX default.
G
If your software has a Lock Speed selection, make sure
it is ON.
These and other guidelines are summarized in the following
tables. Table C-1 lists settings you might be required to change
or verify in your communications or fax software. Table C-2 lists
settings you might be required to change or verify in your
modem.
C-2
Issue 2 July 1995