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Rockwell Protocol Interface
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(RPI) A cost-cutting feature of some modems allowing data
V.42) to be provided in software instead of hardware.
Usually an RPI modem comes with RPI-aware software (e.g. the
low-end RPI models of Supra come with the COMit which
supports RPI, providing MNP 2,4,5,7, V.42 and V.42bis). RPI
is not supported by many commercial packages nor by current
releases of popular shareware communication programs
(Telix v3.22 and Telemate v4.12). ProComm Plus for
Windows 2.0 will support RPI.
Currently Rockwell produce two classes of RPI chip set. The
original is capable of 2400 bit/s data, 9600 bit/s class
1-only fax. The newer one is capable of 14400 bit/s data/fax.
Currently there are no RPI chipset from Rockwell supporting
speeds higher than 14400 bit/s.