Multiplex communications – Wide area network – Packet switching
Patent
1993-04-28
1996-02-20
Coles, Sr., Edward L.
Multiplex communications
Wide area network
Packet switching
3701051, 375368, H04J 306, H04L 700
Patent
active
054935717
ABSTRACT:
A node circuit is operative to couple Manchester encoded data between a transmission medium and an associated electrical device. A first mechanism detects a message frame preamble having a pattern of alternating signal level of substantially identical duration, and a second mechanism that detects a start delimiter in the message frame. The start delimiter has a plurality of binary signal levels in a unique pattern that satisfies a defined set of criteria to optimize the probability that the pattern will be detected while minimizing the likelihood that random valid data will alias into the start delimiter pattern. A data decoder is provided to convert the Manchester encoded data into binary data which then is sent via a signal path to the associated electrical device. Another mechanism is included to detect a unique end delimiter that signals the termination of the message frame.
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Bush Michael A.
Engdahl Jonathan R.
Esker Lawrence W.
Gee David J.
Lucak Mark A.
Allen-Bradley Company Inc.
Coles Sr. Edward L.
Esposo Allan
Hamann H. F.
Horn John J.
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