&%PAGE& - &%page& - Annex 4 to Doc. AVC-22R Annex 4 to Doc. AVC-22R First Simplified Network Model A small group meeting was held and the following approach was agreed; 1) A single stage multiplex is assumed. 2) The network is assumed to exhibit a cell loss/network load characteristics as shown in Appendix 1. An example of this characteristics is shown in Appendix 2. 3) The multiplex is assumed to have a maximum available bandwidth (CAP) of 100 Mbit/s. 4) Cell loss is assumed to be random. 5) Each cell loss corresponds to 48 consecutive bytes of information being lost. END --------------- Appendix 1 to Annex 4/Doc. AVC-22R CLR = exp(-n*K) where CLR is the cell loss ratio. K = {a*ln(a/p)} + [(1-a)*ln{(1-a)/(1-p)}] a = CAP/(n*Peak) Note: 0 < a < 1 CAP = Maximum capacity of the multiplexer output in Mbit/s n = percentage of network loading Note: n is the number of sources, 0 ƒ n … 100. The illustration corresponds to the case of Mean = 1 Mbit/s. Peak = The maximum bit rate over simulation interval (measured on a per frame basis) p = Mean/Peak Note: 0 ƒ p … 1 Mean = The average bit rate over simulation interval ln = log to basis "e" END Appendix 2 to Annex 4/Doc. AVC-22R