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This paper deals with a traffic shaper which spaces all the cells belonging to a bundle of VCs, hence its name bundle-spacer. Although the concept of a bundle-spacer is applicable in general to situations where no VC information is available, we have focused at one particular application, namely the access control of a shared access link to an ATM network. The dimensioning of the bundle-spacer, i.e. finding an optimal value for the spacing period, is achieved by means of a simple rule, called the Bounded Period Rule. This rule aims at finding a compromise between having an almost perfect spacing for high bit rate connections (and hence avoiding clumps of cells) while avoiding high values of delay and CDV for low bit rate connections. Using different performance measures, it is shown that this rule turns the bundle-spacer into both a cost effective and efficient traffic shaping device. |
