H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/104, 354/107
H04L 25/49 (2006.01) H03M 7/46 (2006.01)
Patent
CA 1231176
A GROUP CODING SYSTEM FOR SERIAL DATA TRANSMISSION ABSTRACT OF THE DISCLOSURE A run-length-limited group coding system is provided wherein the code permits a high data transfer efficiency. Code values for both data and control functions are chosen such that the maximum cumulative DC deviation from a nominal center is no more than 10 percent averaged over a data transmission sequence. The code employed limits the maximum number of zero bits between successive one bits in a serial binary sequence to a predetermined value thereby permitting self-clocking. The coding system is particularly suitable for use in baseband data transmission systems where the transmission medium is either an electrical or optical link. Code values for control functions meet the same constraints as those for data and protocols are established such that the coding system may be integrated into a variety of multiple-unit system configurations wherein the communication between units is, for example, by way of a point-to-point link, or a bus, star, loop, or ring arrangement.
447542
Hamstra James R.
Moulton Robert K.
Kirby Eades Gale Baker
Sperry Corporation
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