Paradyne 2001 User Manual page 99

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Your DataPort 2001 and computer (DTE) communicate
via your computer's serial port at a variety of DTE data
rates (baud rates) ranging from 300 bps to 57,600 bps.
Use your software package to select the highest possible
data rate that your computer can support. (Most
packages simply refer to this speed as the Baud Rate.)
If your serial port is configured for 38,400 or 57,600 bps,
and you notice considerable errors in your data
transmission, try configuring it to a lower data rate such
as 19,200 bps. Before using these higher data rates
again, verify that your serial port has a 16550A
compatible UART that can handle 38,400 or 57,600 bps.
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Your DataPort 2001 supports both Class 1 and Class 2
fax. (Class 1 fax places most of the processing burden
on the software while Class 2 fax places it on the
modem.) If the DataPort 2001 is not listed in a particular
fax package, try using a generic Class 2 fax driver if
available.
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The DataPort 2001 defaults to RTS/CTS (hardware) flow
control. Various Macintosh packages require XON/XOFF
(software) flow control. Refer to your software's
documentation for which flow control method to use.
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If the AT&T COMSPHERE 3800 Series modem driver is
listed in a software package, select it and change the
AT\N5 command to AT\N7.
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Throughout this section, various Hayes modem drivers
are recommended, for example Hayes Smartmodem
2400. These drivers are recommended because their
initialization strings closely resemble the DataPort 2001's
settings. Your DataPort 2001 will continue to operate at
the highest dial line rate possible, 14,400 bps.
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If all else fails, configure the DataPort 2001 for No Error
mode by issuing the command ATS84=1&W. While in
this mode, the DataPort 2001 will act on all supported
commands (ATD and ATA) and ignore all unsupported
commands (commands that configure, such as ATS41).
This mode allows the DataPort 2001 to be used in a
variety of applications.