A LINE CODING TECHNIQUE FOR EFFICIENT TRANSMISSION AND DELINEATION OF ENCAPSULATED FRAMES OVER HIGH SPEED DATA LINKS

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 b yte streams with a predefined sequence of bytes assigned to each of said streams , encoding every 2 bits of data in each stream into one of 4 logical voltage l evels 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.