Runt packet filter

Multiplex communications – Wide area network – Packet switching

Patent

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Details

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

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