Method and apparatus for transmission of local area network...

Details Method and apparatus for transmission of local area network... Method and apparatus for transmission of local area network...

H - Electricity

04

J

H04J 1/00 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2045340

METHOD AND APPARATUS FOR TRANSMISSION OF LOCAL AREA NETWORK SIGNALS OVER UNSHIELDED TWISTED PAIRS ABSTRACT OF THE DISCLOSURE Apparatus, and a related method for its opera- tion, for transmitting binary data at high speed through unshielded twisted pairs of conductors intended for a much lower data speed and bandwidth. By using a combination of demultiplexing into multiple data chan- nels, encoding the binary signals into a modified three-level duobinary code, and filtering the signals before transmission, data rates as high as 125 megabits per second can be transmitted over four unshielded twisted pairs of conductors. Two illustrative forms of the invention are disclosed, one of which uses two channels for transmission over two twisted pairs in each direction of transmission. The other form of the invention uses four data channels, to further reduce the transmitted bandwidth in each channel, and four twisted pairs of conductors, for transmission in both directions by means of hybrid circuits interconnecting the transmitter and receiver functions at each end of the channels.

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