Pulse or digital communications – Repeaters – Testing
Patent
1990-06-29
1994-04-12
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375 19, 375 37, 375110, 332106, 329311, H04L 2534, H04L 2549
Patent
active
053032659
ABSTRACT:
A digital communication system using a frequency-independent, high data transmission rate, self-clocking, d.c. balanced data encoding technique. The encoding technique converts two NRZ data bits into a pulse or pulse-pair. The form of the pulse or pulse-pair representing the encoded data bit-pair depends upon the average d.c. level of the previously transmitted pulses. Each pulse of a pulse-pair has a fixed width. The receiver is activated by the leading edge of a transmitted pulse-pair and samples the pulse-pair at points in time determined by the known fixed width of the pulses. The sampled pulse-pairs are then converted into NRZ data bit-pairs. Proper functioning of the receiver does not rely upon the rate upon which the data is transferred. A high data rate is achieved by encoding two bits of data in every pulse or pulse-pair transmitted.
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patent: 4244051 (1981-01-01), Fujikura et al.
patent: 4271526 (1981-06-01), Flora
patent: 4280221 (1981-07-01), Chun et al.
patent: 4282601 (1981-08-01), Flora
patent: 4475212 (1984-10-01), McLean et al.
patent: 4825450 (1989-04-01), Herzog
Bocure Tesfaldet
Digital Equipment Corporation
Kuntz Curtis
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