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The Transmission Rate Of The Modem
- Apr 14, 2017 -

The transmission rate of modem refers to the amount of data transmitted by modem per second. Generally speaking of 14.4K, 28.8K, 33.6K, and so on, refers to the transmission rate of the modem. The transfer rate is in bps (bits/sec). Therefore, a 33.6K modem can transmit 33600bit of data per second. Modems compress data during transmission, so the data throughput of 33.6K modems can theoretically reach 115200bps or even 230400bps.

The transmission rate of modems is actually determined by the modulation protocol supported by modems. The V.32.V.32bis, V.34.V.34+, V.FC and so on in the box or specification of modems refer to the modulation protocol used by modems. The V.32 is a non-synchronous/synchronous 4800/9600bps full Duplex standard protocol; V.32bis is the enhanced version of V.32, which supports 14400bps transmission rate; V.34 is synchronous 28800bps full duplex standard protocol; While V.34+ is synchronous full duplex 33600bps standard protocol. The above standards are formulated by the ITU (International Communication Alliance), while V.FC is a 28800bps modulation protocol proposed by Rockwell, but not widely supported.

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