Method and apparatus for guaranteeing a minimum cell rate (MCR) for asynchronous transfer mode (ATM) traffic queues
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United States of America Patent
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Nov 23, 2004
Grant Date -
Nov 20, 2003
app pub date -
May 20, 2002
filing date -
May 20, 2002
priority date (Note) -
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Abstract
An apparatus for guaranteeing MCR in an ATM device includes at least one queue for each service category, a scheduler for dequeuing cells from the queues, a queue status block for indicating which queues are empty, and an MCR service block. The MCR service block includes a plurality of timers, at least one for each service category. According to the methods of the invention, an MCR value is selected for each queue (or service category) and a timer in the MCR service block is set according to the MCR value. The scheduler dequeues cells in strict priority from non-empty queues as determined by the queue status block. The scheduler is preempted, however, by the MCR service block when a queue fails to be serviced before its associated timer expires. The arrangement of queues and associated timers is subject to alternate embodiments.
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