Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2000-10-31
2009-11-03
Sam, Phirin (Department: 2419)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S352000, C370S395510
Reexamination Certificate
active
07613183
ABSTRACT:
A chunk format for a large-scale, high data throughput router includes a preamble that allows each individual chunk to have clock and data recovery performed before the chunk data is retrieved. The format includes a chunk header that contains information specific to the entire chunk. A chunk according to the present format can contain multiple packet segments, with each segment having its own packet header for packet-specific information. The format provides for a scrambler seed which allows scrambling the data to achieve a favorable zero and one balance as well as minimal run lengths. There are forward error correction (FEC) bytes as well as a chunk cyclical redundancy check (CRC) to detect and/or correct any errors and also to insure a high degree of data and control integrity. Advantageously, a framing symbol inserted into the chunk format itself allows the receiving circuitry to identify or locate a particular chunk format. “Break Bytes” and “Make Bytes” fields located at the beginning of a chunk preamble precondition an optical receiver to a proper state before the actual chunk arrives at the receiver.
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Blackmon Harry C.
Brewer Tony M.
Davies Chris
Dozier Harold W.
McDermott, III Thomas C.
Foundry Networks Inc.
Park Vaughan & Fleming LLP
Sam Phirin
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