Patent attributes
In general, in one aspect, a switching device includes a plurality of ingress ports to receive data from external sources and a plurality of egress ports to transmit data to external destinations. The switching device also includes a plurality of queues to store data waiting to be transmitted from a particular ingress port to a particular egress port. A request generator generates requests for permission to transmit data for the queues. A request indicates a cumulative amount of data contained in a respective queue. A switching matrix provides selective connectivity between the ingress ports and the egress ports. The switching device further includes a scheduler to receive the requests, generate grants based thereon, and configure the switching matrix. The scheduler operates on a pipeline schedule and modifies the requests received to account for grants generated in current period or previous period not reflected in the queues.
