Packet framing using cyclic redundancy checking
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United States of America Patent
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-
Dec 10, 1991
Issued Date -
N/A
app pub date -
Feb 15, 1990
filing date -
Dec 21, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Packets transported over a serial data stream need to have their start and stop information encoded so that they can be parsed by the receiving device. Techniques used in various standards require extra bandwidth to carry this information. For framed data streams like T1, proprietary protocols have used the frame structure to mark packet boundaries. Both types of solutions are undesirable for unframed, long distance data streams like the CCITT G.703 2.048 Mbps unframed service, subrate trunks, or fractional T1 services. The present invention provides a packet framing method that uses the Cyclic Redundancy Check (CRC) found in most packet formats. The protocol does not require any extra bandwidth and can work with any serial data stream physical layer.
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