Data transmission system for a local network

Details Data transmission system for a local network Data transmission system for a local network

1983-12-19

1986-06-17

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 94, 3408255, H04J 302, H04J 600

Patent

active

045960119

ABSTRACT:
A local network, in which a plurality of data processors are coupled by modems to a communication medium, is disclosed. Each modem is arranged to shift a carrier frequency to a first and second frequency according to a digital signal from the associated data processor. In order to provide for reliable and quick detection of a collision of signals simultaneously transmitted from a plurality of modems to the communication medium, the difference between the first and second frequencies is set such that one cycle of a beat signal generated on the communication medium due to a collision of signals is not longer than one bit time length of the digital signal.

REFERENCES:
patent: 4199663 (1980-04-01), Herzog
patent: 4210780 (1980-07-01), Hopkins et al.
patent: 4345250 (1982-08-01), Jacobsthal
patent: 4470110 (1984-09-01), Chiarottino et al.
patent: 4476467 (1984-10-01), Terwilliger et al.
IEEE 802 Local Network Standard, Draft B, Chapter V.2, 8.0 Appendix, Oct. 19, 1981.

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