Collision filter

Details Collision filter Collision filter

1990-02-20

1992-04-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 852, 3408255, H04J 302

Patent

active

051074915

ABSTRACT:
There is disclosed a collision filter for use in a network to detect a fault condition wherein two or more nodes are simultaneously transmitting on the network. The fault condition is characterized by an increased average DC voltage level on the network. The collision filter includes a low pass filter stage having an input coupled to the network and an output and a notch filter having an input coupled to the low pass filter stage output. The notch filter has at least one attenuation notch at a desired frequency and an output for providing the increased average DC voltage level responsive to a fault condition.

REFERENCES:
patent: 3813669 (1974-05-01), Saunders
patent: 4438298 (1984-03-01), Rubin
patent: 4534024 (1985-08-01), Maxemchuk
patent: 4608559 (1986-08-01), Friedman et al.
patent: 4611320 (1986-09-01), Southard
patent: 4644348 (1987-02-01), Gerety
patent: 4810949 (1989-03-01), Schiemenz et al.

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