Packet synchronization utilizing a multi-length packet format in

Details Packet synchronization utilizing a multi-length packet format in Packet synchronization utilizing a multi-length packet format in

1989-06-23

1991-03-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, 370 851, H04J 300

Patent

active

050035355

ABSTRACT:
Packet synchronization is obtained by employing a unique packet transport word including at least one prescribed parity check pattern in conjunction with a packet length indicator. An at least one prescribed parity check is computed over transport word length blocks of bits of an incoming packet and compared to an expected parity check pattern in predetermined bit positions in the incoming block of bits to identify possible transport word candidates. Once a transport word candidate is identified the packet length indicator is used to point to the next transport word candidate. Synchronization is declared upon obtaining a parity match for a subsequent transport word candidate pointed to by the packet length indicator. In a specific embodiment, at least two prescribed parity checks are employed to denote a possible transport word candidate.

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J. A. McDermid, "Design and Use of Comflex-A Hardware-Controlled Packet Switch", IEEE Proceedings, vol. 127, Pt.E., No. 6, pp. 233-240, Nov. 1980.
W. Stallings, "Data and Computer Communications", 2nd edition, Macmillian Publishing Co., 1988, pp. 104-107.

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