Boca Systems M144PA, Manual

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14.4 BOCAMODEMcard-PC
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V.21 The CCITT standard for 300bps communications.
Domestic modems follow the Bell 103 standard,
but V.21 can accept international calls at 300bps.
V.22 The CCITT standard for 1200bps communications.
The domestic equivalent is the Bell 212A standard.
V.22bis The CCITT standard for 2400bps.
V.23 CCITT for 1200bps with a 75bps back channel. This is
mostly used in Europe and South America.
V.24 CCITT serial interface standard (EIA/RS232-D).
V.32 CCITT standard for 9600bps and 4800bps
communications.
V.32bis CCITT standard for an extensive range of high-speed
modems operating at 14,400bps, 12Kbps, 9600bps,
7200bps, and 4800bps.
V.42 CCITT standard for detection and negotiation for
LAPM (Link Access Procedure for Modems) error
control. V.42 will also support MNP levels 2-4.
V.42bis An extension of V.42 specifying the data compression
protocol for use with V.42.