Multiplex communications – Wide area network – Packet switching
Patent
1991-10-17
1993-12-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 691, 370120, 370124, H04J 302
Patent
active
052727009
ABSTRACT:
A baseband signal is spectrally efficiently transmitted on a broadband transmission medium by inserting gaps in packets of digital data transmitted in a modulated first radio frequency carrier. The transmitted packets of data are received by demodulating the modulated first radio frequency carrier, and the gap is monitored for the presence of digital data thus indicating a collision of simultaneously transmitted packets of digital data. A seed of arbitrary digital bits are used in scrambling each packet of digital data and is transmitted with the packet of data for use in descrambling the data. In retransmitting the packet of data the seed is included. The originally transmitting node receives the retransmitted packet and compares the retransmitted seed with the originally transmitted seed for detecting an error in retransmission.
REFERENCES:
patent: Re32327 (1987-01-01), Biba et al.
patent: 4498169 (1985-02-01), Rozmus
patent: 4751701 (1988-06-01), Roos et al.
patent: 5084903 (1992-01-01), McNamara et al.
patent: 5088111 (1992-02-01), McNamara et al.
Hansen David E.
Long James C.
McNamara Robert P.
Phan Chinh Q.
Serrone Michael J.
Blum Russell W.
First Pacific Networks, Inc.
Olms Douglas W.
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