H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01) H04J 3/16 (2006.01)
Patent
CA 2254407
A method of controlling asymmetrical port access in a common-memory (CM) multi-port data packet switch and a high-capacity flexible access rate CM data packet switch are described. The method involves providing a common-memory- access control table which defines a unique contiguous band of CM access time slots allocated to each port of the packet switch. Each access time slot is identified by a time slot identifier. Time slot identifiers are generated at a regular interval. The time slot identifiers are generated so that CM access time for each port is substantially equally spaced to minimize delay fitter. The packet switch may have an equal number of input and output ports, or more output ports than input ports. In the high-capacity CM packet switch, several CM switch modules are interlinked by middle buffers in a folded configuration to provide a packet switch having Terabit output capacity. The advantage is a packet switch architecture which supports flexible access rates to eliminate idle switch capacity, the CM access time slots being substantially equally spaced apart to reduce packet transfer delay fitter.
Nortel Networks Limited
Northern Telecom Limited
Norton Rose Or S.e.n.c.r.l.,s.r.l./llp
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