Data transmission system for a local network

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

H - Electricity

04

B

325/16

H04B 1/40 (2006.01) H04B 3/10 (2006.01) H04L 12/28 (2006.01) H04L 27/10 (2006.01)

Patent

CA 1204164

- 25 - Abstract of the Disclosure 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 com- munication 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.

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