Line coding technique for efficient transmission and delineation

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels

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H04J 306

Patent

active

060883693

ABSTRACT:
According to the invention there is provided a method of signal coding that permits high speed data transmission over multiple pairs of UTP-5 cable from a transmission end to a receiving end which includes, at the transmission end, separating an incoming frame of data into a plurality of byte streams with a predefined sequence of bytes assigned to each of the streams, encoding every 2 bits of data in each stream into one of 4 logical voltage levels forming a symbol or quat thereby reducing the symbol or baud rate by 50% and inserting an escape sequence into one or more of the streams consisting of a sequence of zero's followed by a control code to indicate a transition from one state to another. At a receiving end, the method further includes reading the escape sequence and decoding the signals in accordance with the code contained in the escape sequence.

REFERENCES:
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patent: 5257270 (1993-10-01), Hilden et al.
patent: 5301187 (1994-04-01), Reum
patent: 5878221 (1999-03-01), Szkopek et al.
PMC-Sierra, Inc. Document No. PMC-960837 "Physical Layer Proposal for 1 Gbit/s Full/Half Duplex Ethernet Transmission over Single (4-pair) or Dual (8-pair) UTP-5 Cable" Nov. 11-14, 1996.
PMC-Sierra, Inc. Document No. PMC-961008 "PCS Mapping using 4LZS codes" Sep., 1996.

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