Dual multipoint data transmission system modem

Details Dual multipoint data transmission system modem Dual multipoint data transmission system modem

1980-01-24

1982-06-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 691, 370 71, H04J 118

Patent

active

043354645

ABSTRACT:
A modem is provided which allows two independent sets of multipoint users to share a common communication media such as a telephone channel. At each site there is provided a modem which transmits and receives two independent frequency division multiplexed data streams simultaneously over a common telephone channel. Each data stream is encoded into an eight phase PSK or QAM signal. One data stream signal is transmitted in a low frequency range and the second is transmitted in a high frequency range. Means are provided at each site to combine the data streams for transmission over a single communication line and to separate the received combined signal from the communication line.

REFERENCES:
patent: 1717064 (1929-06-01), Rettenmeyer
patent: 2407684 (1946-09-01), Roberts
patent: 3202762 (1965-08-01), Aaron et al.
patent: 3701852 (1972-10-01), Sluijter et al.

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