Detecting valid data from a twisted pair medium

Details Detecting valid data from a twisted pair medium Detecting valid data from a twisted pair medium

1992-07-31

1994-12-13

Beausoliel, Jr., Robert W.

Excavating

371 61, 371 682, 371 572, H01S 310

Patent

active

053735080

ABSTRACT:
Two parallel valid data detectors are provided to detect whether a sinusoidal electrical signal from a twisted pair medium represents valid data. One handles phase 0 degree starting sinusoidal electrical signal, the other handle phase 180 degree. In either case, the valid data detectors receive two series of pulses as input, indicating positive and negative differences respectively between RD and RD from the twisted pair medium. In response, if the valid data detector detects the proper data pattern within a predetermined time frame, it outputs a signal indicating the detection of valid data. The "phase 0" valid data detector looks for a high to low and back to high data pattern, whereas, the "phase 180" valid data detector looks for a low to high and back to low data pattern. Additionally, a signal magnitude detector is provided to detect magnitude differences between RD+ and RD- from the twisted pair medium, and generate the positive and a negative series of pulses for the valid data detectors, as long as the magnitude differences exceeded a predetermined minimum threshold. Furthermore, a signal synchronizer is provided to receive the valid data detection signal from either valid data detector, and synchronize the generated signal to the internal clock of the receiving circuit.

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Twisted-Pair Medium Attachment Unit and Baseband Medium Type 10BASE-T (Section 14), Local and Metropolitan Area networks, IEEE Standard 802.3i-1990, published by IEEE, New York, N.Y.

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