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US 4,307,468 AGranted
Data transmission systems
AssigneeElliott Brothers (London) Limited
InventorsRobin D. Beasley, Robert James
Life of this patent
Estimating the term…
Abstract
A data transmission system including a transmitting station (13 to 15 and T) wherein three-state signals representing data are converted to two-state signals so that the data can be transmitted via a transmission line adapted to transmit only two-state signals such as a fibre optic transmission line.
Claims5
A data transmission system including a transmitting station comprising:
- means for generating a three-state first data signal comprising pulses of a fixed first duration and both polarities with respect to a datum level interspersed with portions at said datum level;
- means for converting said three-state data signal into a two-state second data signal comprising pulses of a fixed second duration less than said first duration, each pulse of one polarity in the first data signal being represented by a pulse in the second data signal, each pulse of the other polarity in the first data signal being represented by the absence of a pulse in the second data signal, and each said datum level portion in the first data signal being represented by a plurality of pulses in the second data signal occurring within a period of duration less than said first duration;
- and means for transmitting said two-state data signal along a transmission line.
Dependencies are inferred from the claim text.