Digital modems developed from the need to transmit data for North American air defense during the 1950s. Modems were used to communicate data over the public switched telephone network or PSTN. Analog telephone circuits can only transmit signals that are within the frequency range of voice communication. A modem sends and receives data between two computers. Modem stands for modulate/demodulate.
In 1962, the first commercial modem was manufactured - the
The 56K modem was invented by Dr. Brent Townsend in 1996.
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