Ositech comm Trumpcard Data/Fax Modem User's Manual And Reference page 16

Section One
V.42
V.42 refers to the standard set by ITU-T for error control protocol. The
V.42 standard also supports the MNP error correction protocol standard.
V.42bis
V.42 bis refers to the standard set by ITU-T for data compression. Data
compression can only be used in conjunction with error correction.
MNP 2, 3, and 4
MNP 2, 3, and 4 refers to an alternate standard for error correction
protocol.
MNP 10
MNP 10 refers to a error correction protocol often used in harsh
environments (cellular use)
MNP 5
MNP 5 refers to an alternate standard for data compression.
V.17
V.17 refers to the standards set by ITU-T for 14400, 12000, 9600 and
7200 bps facsimile communications
V.29
V.29 refers to the standards set by ITU-T for 9600 and 7200 bps facsimile
communications.
V.27ter
V.27ter refers to the standards set by ITU-T for 4800 and 2400 bps
facsimile communications.
V.FC
V.FC refers to Rockwell's proprietary Modem communications standard
for 28800, 26400, 24000, 21600, 19200, 16800, and 14400 bps
communications.
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