In this system the two tones for any one side of the connection are sent at similar frequencies as in the 300 bit/s systems, but slightly out of phase. Voiceband modems generally remained at 300 and 1,200 bit/s (V.21 and V.22) into the mid-1980s. A V.22bis 2,400-bit/s system similar in concept to the 1,200-bit/s Bell 212 signaling was introduced in the U.S., and a slightly different one in Europe. The limited available frequency range meant the symbol rate of 1,200 bit/s modems was still only 600 baud .
- This is accomplished through hardware flow control using extra lines on the modem–computer connection.
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However, the software generating and interpreting the modem tones to be sent to the softmodem uses many system resources. Another problem is the lack of cross-platform compatibility, meaning that non-Windows operating systems often do not have an equivalent driver to operate the modem. This is accomplished through hardware flow control using extra lines on the modem–computer connection.
