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Quality of Service (QoS) provisioning is rapidly becoming an assumed attribute of core packet switching systems. Substantial work has been focused on designing algorithms which offer strict QoS guarantees under a broad range of traffic scenarios. The majority of these scheduling algorithms can be realized utilizing Push-In-First-Out (PIFO) queues, which are characterized by allowing packets to enter the queue at arbitrary locations while departures occur from the head of line position only. Although the PIFO queueing mechanism has received attention in recent years, it is generally considered impractical from a hardware implementation perspective.
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