Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1987-11-09
1989-06-20
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
375121, 370102, 370118, H04L 700
Patent
active
048415502
ABSTRACT:
A communication device in the form of data terminal equipment permits two data communication equipments, each having its own master clock and operating at substantially the same nominal clock rate, to communicate with each other in a multi-segment circuit configuration of a general communication network even when phase or frequency errors exist between the two clocks. Data transmitted between communication equipments of two segments of the communication network is buffered. A variable buffer fill circuit is provided to fill the buffer to a selectable extent prior to initiation of data output clocking. Selection switches are provided to select the degree of buffer preload. A dynamic buffer fill circuit may be incorporated for automatically selecting the buffer fill level as a function of the difference in clock frequencies of the two equipments. Controllable alarm circuitry is provided for selectively generating an underflow or an overflow alarm to one or both of the communicating equipments.
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George Michael
Pierson Lyndon G.
Wilkins Mark E.
Chafin James H.
Chin Stephen
Griffin Robert L.
Libman George H.
Moser William R.
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