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

1987-08-13

1990-03-13

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307549, 307555, 370 851, 370 941, 371 64, 375104, H03K 1716, H03K 193

Patent

active

049085301

ABSTRACT:
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.

REFERENCES:
patent: 4504959 (1985-03-01), Heckenbach
patent: 4597082 (1986-06-01), Hill et al.
patent: 4602364 (1986-07-01), Herman et al.

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