Pulse or digital communications – Repeaters – Testing
Patent
1989-02-07
1991-02-19
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 37, 340861, H04J 300, G01V 100
Patent
active
049950584
ABSTRACT:
In a wireline data transmission system for passing data between downhole and surface locations in a wellbore, a system for transmitting data at a frequency above the relatively low roll of frequency of a wireline permits higher data rates to be transmitted over the wireline than would be possible using standard digital data formats. The present system utilizes short duration pulses which are placed on the wireline in conformity to the transition edge between voltage levels in a typical digital data format, and thus transmits the digital data over the wireline in a manner which is not adversely affected by the phase shifting which normally occurs when bi-level voltage data formats are used for data transmission over a wireline. The short duration pulses are placed on the wireline at a time position in a data format that corresponds to the beginning of a bit period and the pulse width is such that it only occupies a fraction of the bit period so that any phase shifting on the pulse does not shift the pulse into a succeeding bit period to thereby adversely affect data interpretation.
REFERENCES:
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Byers Terry B.
Vaynshteyn Vladimir
Baker Hughes Inc.
Edwards Christopher O.
Polacek Michael
Safourek Benedict V.
Walkowski Joseph A.
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