Two/Four Wire Digital Subset.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1975
- Accession Number
- ADA011729