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Abstract

A method for encapsulation of labeled datagrams over serial communications links, and a method for extracting the datagrams on the receiving end of the link. The encapsulation method includes adding a label and a label error correction to the front of a datagram, the label error correction being derived using the label and adding a cyclic redundancy check at a trailing end of the datagram, the cyclic redundancy check being derived using the datagram. The end of a packet encapsulating the datagram with a label, a label error correction field and a cyclic redundancy check field is identified by analyzing incoming bits for a packet until a pattern of bits is detected that matches a number of previous bits of the packet coded with a predetermined coding formula and identifying the end of the packet based upon the detection of the match and the predetermined coding formula. The end of the current frame may be identified by coding incoming bits according to the cyclic redundancy check polynomial to produce a calculated cyclic redundancy check until the calculated cyclic redundancy check matches the cyclic redundancy check field. In addition, or alternatively, the end of the previous frame may be identified by coding incoming bits according to the label error correction polynomial to produce a calculated label error correction until the label error correction matches the label error correction field.

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First Claim