Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-02-17
1985-11-19
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
370 86, 375 36, H04J 306
Patent
active
045546738
ABSTRACT:
A data transmission system is formed from a series of data transmission loops (2). Each loop includes an interface unit (3) for an attached device and is connected at either end to a synchronizing and switching module (5) in a central unit. The loops (2) are connected by the modules (5) into a continuous data-transmission path connecting the interface units in sequence.
The interface units 3 each acts as a synchronous repeater and/or a source of fresh data. To prevent the accumulation of jitter in the clock signals derived in the interface units each module (5) contains a first-in first-out buffer (25) in which the data is resynchronized to a common clock source (7) used by all the modules. The modules (5) also bypass any loop which contains an inoperable unit over a link (35).
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Chin Stephen
Griffin Robert L.
International Computers Limited
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