invented email in 1972.
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
recieves data between two computers. Modem stands for modulate/demodulate.
In 1962, the first commercial modem
was manufactured - the Bell 103 by AT&T. The Bell 103 was also the
first modem with full-duplex transmission, frequency-shift keying or FSK,
and had a speed of 300 bits per second or 300 bauds.
The 56K modem was invented by Dr.
Brent Townshend in 1996.
Robert Lucky invented the automatic
adaptive equalizer in 1965 at Bell Laboratories.
Man behind the Modems
Brent Townshend, the man who dreamed
up the idea for 56K bit/sec modems.
receives patent for PCM modems
Brent Townshend, the Quebec-based
developer who worked on several core concepts for pulse-code modulated
(PCM) modems, received several U.S. patents for that technology.
Fax Machine and the Facsimile
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