Two/Four Wire Digital Subset.
NORTH ELECTRIC CO GALION OHIO GOVERNMENT PRODUCTS DIV
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This interim technical report contains information regarding the transmission of digital signals over 2 wire transmission facilities on a full duplex basis, heretofore only possible over 4 wire transmission facilities. It covers the results derived from a study of wire transmission characteristics. Based on the results of this study, three techniques are described as potential candidates. They are as follows 1 Frequency Division Multiplexing Technique 2 Signal Superimposition Technique whereby digital signals traversing in opposite directions are shifted in such a manner that the outgoing digital signal transitions occur in the middle of an incoming digital stream thereby enabling both signals to be recovered 3 Time Division Multiplexing Technique. The conclusions indicate that, although all three techniques described above are technically feasible, only 2 and 3 offer economical advantages.
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