Non-linear squelch circuit for ieee-802.3 protocol

Details Non-linear squelch circuit for ieee-802.3 protocol Non-linear squelch circuit for ieee-802.3 protocol

H - Electricity

04

L

340/72

H04L 1/20 (2006.01)

Patent

CA 1321415

ABSTRACT OF THE DISCLOSURE Method and apparatus for non-linearly filtering impulse and low frequency noise received over a network so as to avoid false activation of equipment is disclosed. A squelch circuit assures that only multiple transitions of at least three half-cycles in the received waveform of a proper frequency and amplitude will activate the receive while a single half-cycle, although of a proper frequency and exceeding the threshold, will not falsely activate the receiver. RC circuits provide a variable delay in the squelch portion of the filter to suppress impulses. In an alternative embodiment, double half-cycles will not falsely activate the receiver. Emitter-coupled logic (ECL) circuitry is preferably employed to provide speed adequate for ten-million bit per second transmissions.

570340

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