Multiplex communications – Wide area network – Packet switching
Patent
1990-01-26
1991-05-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 4, 370 82, 370 84, 370 99, 455608, H04J 300, H04J 1408
Patent
active
050181424
ABSTRACT:
A digital communications system includes a transmitting section that receives electrical signals in parallel and transmits them serially by means of an optic fiber (10) to a receiving section (11). A sampler/filter (20) samples the incoming electrical signals at a rate several times that of the maximum data rate expected of those signals and employs majority-vote circuits (116) to change the value of any samples that are not part of a plurality of sequential samples of the same value. The achieve as balanced a signal as possible, a complementing unit (36) complements alternate groups of bits, and a coding unit (40) imposes a 4-to-5 code in which the code-word imbalances for complementary data words are opposite in the majority of cases. A serializing unit (44) serializes the resulting codewords, which an electrical-to-optical converter (8) transmits over the optic fiber (10) to the receiving section (11), which performs operations the reverse of those performed by the transmitting section (3) so as to forward parallel electrical signals.
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Simcoe Robert J.
Waters Gregory M.
Digital Equipment Corporation
Hsu Alpus H.
Olms Douglas W.
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