POLICING METHOD

摘要

A policing method is proposed policing an aggregate ATM cell stream (IN) consisting of both high and low priority cells. The method consists in policing the aggreqated stream as a whole whilst also policing separately a substream formed by the high priority cells as prescribed by ITU-TS recommendation I.371. The present policing method always inserts a high priority cell satisfying the last mentioned separate policing step into the output stream (OUT) regardless of the result of the first mentioned aggregate policing step. In order to keep a good performance for the method, the predicted arrival time used in this aggregate policing step is however also updated for such a high priority cell which does not conform to this aggregate policing step. The latter requires a modification of the known and commonly used Virtual Scheduling Algorithm.