Method and apparatus for in-band signalling in data transmission

Details Method and apparatus for in-band signalling in data transmission Method and apparatus for in-band signalling in data transmission

1975-01-27

1976-08-31

Dildine, Jr., R. Stephen

Communications: electrical

Digital comparator systems

178 69G, 325155, 3401461AB, 3401461C, H03K 518, H04L 108

Patent

active

039784495

ABSTRACT:
An in-band signalling system for the transmission of both data and control signals through a common communications channel is disclosed. Unique means of distinguishing data bits from control bits is employed without the use of additional bandwidth over that which would be required for the data alone.
A novel method for signalling includes the steps of translating the data bits into a different code set than the original, examining it for control words and if any are present, modifying or corrupting the data and thereafter combining on a time division basis the translated and/or modified data and control words over a transmission channel. To receive, data is inversely modified and control words detected. Error detection of control words is achieved by translating control words followed by their complements.

REFERENCES:
patent: 3427585 (1969-02-01), Milford
patent: 3624603 (1971-11-01), Delcomyn

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