Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1976-02-12
1977-02-08
Safourek, Benedict V.
Telegraphy
Systems
Line-clearing and circuit maintenance
178 70R, 328155, H04L 700
Patent
active
040073297
ABSTRACT:
A data communication system for asynchronously transmitting intermittently generated digitally encoded data between a data processor and a plurality of data terminals associated therewith is disclosed wherein the allowable communications line distance between the data processor and the terminals is substantially increased. Asynchronous data from the terminals is intercepted by a novel repeater, retimed in accordance with a newly generated retiming clock to eliminate bit-shift or other errors from the data, and retransmitted to the central processor over an extended length transmission line, with the repeater being substantially transparent to the flow of data. Decoding of an appropriate code by the repeater which is indicative of the receipt of a data character causes the switching from a data derived clock to a retiming clock for reencoding and retransmission of the data.
REFERENCES:
patent: 3760111 (1973-09-01), Sawai
patent: 3946323 (1976-03-01), Bjerede
patent: 3959601 (1976-05-01), Olevsky
Burkey John K.
McClain Herbert D.
Parikh Bipin D.
Cavender J. T.
Hawk Jr. Wilbert
Morris Jeffrey P.
NCR Corporation
Safourek Benedict V.
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