Importance

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Abstract

A data flow egress scheduler and shaper provides multiple levels of scheduling for data packets exiting communications devices. A classifier separates data from multiple sources by data flow and by priority within a data flow. An output controller requests a data packet for transmission and the scheduler selects a next available highest priority packet from a next in sequence data flow or from a management data queue. The shaper can control the rates of classes of service to be scheduled by the device. The scheduler typically comprises three levels of scheduling. Large numbers of output ports can be implemented in a single device by a virtual scheduler that services each data flow, output port and data source as a shared component, maintain context for groups of schedulers and data flows.

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First Claim