Multiplex communications – Wide area network – Packet switching
Patent
1985-11-14
1987-07-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 97, 370108, H04J 324, H04J 306, H04B 336
Patent
active
046791930
ABSTRACT:
Provided is a circuit for preventing local area network packets shorter than a predetermined bit length from being received by a local area network coprocessor. Serial data which would otherwise be received by the coprocessor is delayed by a data-shift register of predetermined bit length. Simultaneously, a carrier-sense-signal, which alerts the coprocessor that serial data is ready to be received, is modified by a carrier-sense-signal regeneration circuit. If the carrier-sense-signal is detected true by the regeneration circuit for a number of clock cycles equal to the number of bits in the data-shift register, then the carrier-sense-signal is delivered to the coprocessor and the data in the data-shift register is received by the coprocessor. Once the carrier-sense signal goes false, the regeneration circuit continues to deliver the carrier-sense-signal until the data-shift register empties.
REFERENCES:
patent: 3908084 (1975-09-01), Wiley
patent: 4500990 (1985-02-01), Akashi
Jensen Gordon A.
Morris Jerry D.
Neal Scott S.
Reames Stephen P.
Byrne Christopher J.
Hewlett -Packard Company
Olms Douglas W.
Scutch III Frank M.
Stark Jon R.
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