Packetized ensemble modem

Details Packetized ensemble modem Packetized ensemble modem

1980-11-10

1984-03-20

Brigance, Gerald L.

Multiplex communications

Wide area network

Packet switching

370 60, 370 94, 370 16, 370 50, H04J 1100, H04J 400

Patent

active

044385110

ABSTRACT:
A high speed digital data modem particularly suited for use on a dial up telephone line is disclosed. For the transmit ensemble, the telephone passband is divided into sixty-four sub-bands each with a carrier located approximately in the center of each sub-band. Each carrier is amplitude and phase modulated in order to encode five (5) bits. One carrier is used as a reference signal for phase and amplitude. The modulated carriers can be changed in data content every epoch. By use of packetization of data, individual amplitude correction, and individual phase correction for each carrier, the high speed modem may achieve up to 12000 bps over a dial up line with a simultaneous 300 bps reverse channel.

REFERENCES:
patent: 3706929 (1972-12-01), Robinson
patent: 3875394 (1975-04-01), Shapely et al.
patent: 4206320 (1980-06-01), Keasler et al.
Product Brochure for Gandalf SM9600 Super Modem, Gandalf Data, Inc.
"Digital Super Modem: Why and How It Was Developed", Data Communications, Jun. 1980, pp. 87-95, Hick.
Product Brochure for AT&T 2096A, 9600 bps, Dataphone II.

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