Method and means for automatically detecting and correcting a po

Details Method and means for automatically detecting and correcting a po Method and means for automatically detecting and correcting a po

1992-05-08

1994-05-24

Canney, Vincent P.

Excavating

371 204, 371 65, H04L 1240

Patent

active

053155971

ABSTRACT:
A circuit for incorporation into LAN-compatible devices uses both the link integrity test (LIT) pulses and the end of frame delimiter (EOF) waveform information in received data transmissions to detect polarity errors on the twisted-pair media to which the devices are connected. The circuit integrates this information and a new auto-polarity detection/correction algorithm with the LIT algorithm of the IEEE 10 Base T standard to provide a stable and reliable twisted-pair link operation. Also, once the circuit is in its normal operational stage, it will not declare that a link is faulty unless it fails to receive a LIT pulse or an EOF waveform within a time-out period that is in accord with the IEEE standard. Therefore, the circuit is quite insensitive to line noise.

REFERENCES:
patent: 5107489 (1992-05-01), Brown et al.
patent: 5249183 (1993-09-01), Wong et al.

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