Current standards reserve one bit in the ATM cell header toindicate loss priority. When congestion occurs at a queue lower prioritycells can be discarded in order to insure a smaller cell loss rate forhigher priority cells. Strategies for determining which cells to discardare termed space priority buffer management schemes. In this paper twoadjustable space priority schemes are studied where a cell upon arrivingto a full buffer can pushout a cell of opposite priority depending uponan adjustable parameter. A queueing analysis of an ATM switching node isconducted to compare the adjustable pushout schemes with other commonspace priority mechanisms
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