Pluris, Inc.

Eric J Spada

Jeffrey A Koehler

Eric J Pelletier

Steven J Schwartz

James D Carlson

A system and method for transferring data from a source to a destination are described. Data packets are split into multiple data packet portions and are transferred in parallel over parallel data streams or pipes to grouping circuitry where they are recombined into full data packets. Each packet portion is assigned a synchronization code and a pipe state machine state. The grouping circuitry reads individual packet portions from the parallel streams and analyzes the synchronization codes and the state machine states to determine if the individual packet portions were generated from the same packet. If so, they are recombined into a full packet and are forwarded to the destination. If not, an error is detected. The grouping circuitry automatically realigns the data streams to recover synchronization without the need for any feedback to the individual streams to correct the error.

Apparatus and method for synchronization of multiple data paths and recovery from lost synchronization

A method and apparatus for reallocating switching circuitry in a switching fabric are disclosed. The switching fabric is used to permit data transfer among a plurality of interface units each having a plurality of data ports. The switching fabric is partitionable into a plurality of switch planes such that each switch plane can be assigned to transfer data associated with like data ports of the interface units. Each switch plane includes multiple switching channels each assignable to transfer data associated with one data port of one of the interface units, in a full implementation. The number of interface units is less than the number of switching channels in a switch plane, then the reallocation is performed such that multiple channels of at least one switch plane can be assigned to transfer data of multiple ports of at least one of the interface units. This results in switch plane channels that would otherwise be unused being utilized to transfer data. This reallocation of switch plane channels can result in the elimination of one or more switch planes from the switch fabric resulting in substantially reduced hardware complexity and cost.

Apparatus and method for scaling a switching fabric in a network switching node

An apparatus and method for queuing data such as data being transferred across or within a switching node on a network are described. The queuing apparatus includes a plurality of inputs for receiving data to be transferred to at least one output, each input being adapted to receive data at a data rate associated with the input. Each input transfers data to a relatively short queue which stores the data received at the input. Each output is associated with as many short queues as their inputs capable of transferring data to the output. A long queue associated with the output receives data from each of the short queues associated with the output and forwards the data to the output. A control circuit associated with the output transfers data stored in all of the short queues associated with the output into the long queue. This transfer takes place at a data rate that is higher than the data rate associated with the input such that the short queues are prevented from becoming full. By implementing the queuing system in many short queues instead of fewer long queues, the overall system is more efficient and inexpensive to implement.

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Lexington, MA, United States of America

Eric J Spada