Apparatus and method for detecting and correcting reverse polari

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G06F 1100

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active

057270066

ABSTRACT:
The present invention allows for the detection and correction of certain error conditions in packet-based data communications systems, including systems utilizing multiple channels or signal pairs, where all channels or signal pairs do not carry a link integrity signal or other repetitive non-data signal. A first aspect of the present invention provides detection and correction for reverse polarity. A second aspect of the present invention provides detection and correction for pair swap. A third aspect of the present invention provides a link integrity function. Detection of reverse polarity, detection of pair swap, and detection of link integrity by utilizes the non-data components of received packets, either independently or in conjunction with a link integrity signal or other repetitive non-data signal. Reverse polarity is corrected by inverting the received signals prior to transmission or repetition to subsequent circuitry. Pair swap is corrected by switching the signals received on the swapped pairs prior to transmission or repetition to subsequent circuitry. Link integrity status is indicated via a transmitted signal.

REFERENCES:
patent: 5414708 (1995-05-01), Webber et al.
patent: 5467369 (1995-11-01), Vijel et al.
"10/100 Base-T4 Fast-.PHI..TM. Transceiver", BCM5000-SP9 (Broadcom Corporation), Apr. 2, 1996, pp. 1-38.
"100Base-T4/10BASE-T Fast Ethernet Transceiver (CAT3)", Doc. No. 38-00415 (Cypress-CY7C971), pp. 7-42 to 7-65.
"10Mbps/100Mbps Lan Physical Layer Interface", (Intel-82553), pp. 1-60.
"100BASE-T SPECIFICATION", Presentation Reprints from IEEE 802.3 High-Speed Study Group, Fast Ethernet Alliance, Mar. 7, 1994.
"Physical coding sublayer (PCS) physical medium attachment sublayer (PMA) and baseband medium, type 100BASE-T4"; IEEE Standard 802.3U-Jun. 12, 1995; Clause 23; pp. 59-138.
Intel, "10 Mbps/100Mbps Lan Physical Layer Interface", Apr. 1995, pp. 1-60.

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