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Appendix EResults for a 6 Mbps upstream channel pMean Access Delay (msec)Throughput (kbits/sec)a) Effects of packet size inisochronous streams at 8 Kbps100908070605040302010040003600320028002400200016001200AB64byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 60 110 160 210 260 310 360 410 460 510 560Number of Cable Modems800400064byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk8Kbps streams6.17Mbps UpstreamC8Kbps streams6.17Mbps Up10 60 110 160 210 260 310 360 410 460 510Number of Cable ModemsMean Access Delay (msec)Throughput (kbits/sec)b) Effects of packet size inisochronous streams at 32 Kbps1009080706050403020100400035003000250020001500100050032Kbps streams6.17Mbps Upstream64byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160Number of Cable Modems064byte-Pk128byte-Pk256byte-Pk512byte-Pk1024byte-Pk32Kbps streams6.17Mbps Upstr10 20 30 40 50 60 70 80 90 100 110 120 130 140 150Number of Cable ModemsMean Access Delay (msec)Throughput (kbits/sec)c) Effects of packet size inisochronous streams at 64 Kbps1009080706050403020100400035003000250020001500100050064Kbps streams6.17Mbps Upstream128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 15 20 25 30 35 40 45 50 55 60 65 70Number of Cable Modems064Kbps streams6.17Mbps Upstream128byte-Pk256byte-Pk512byte-Pk1024byte-Pk10 15 20 25 30 35 40 45 50 55 60 65 70Number of Cable ModemsMean Access Delay (msec)d) Channel capacity for different isochronous streams, 128-byte packe size.1009080706050403020100128-byte pkt6.17 Mbps Up8 Kbps16 Kbps32 Kbps64 Kbps10 40 70 100 130 160 190 220 250 280 310 340Number of Cable ModemsThroughput (kbits/sec)22002000180016001400120010008006004002000128-byte pkt6.17 Mbps Up8 Kbps16 Kbps32 Kbps64 Kbps10 35 60 85 110 135 160 185 210 235 260 285Number of Cable ModemsMean Access Delay (msec)e) Fixed acces vs. reservation access1009080706050403020100Reservation Slots512-Byte Pk128-Byte Pkt10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95Number of Cable ModemsFxdSlots64Kbps streams6.17Mbps UpstreamFixed & Rsrv Access128b_Fxd512b_Fxd128b_Rsv512b_RsvMean Access Delay (msec)10090807060504030201008 Kbps16 Kbps32 Kbps64 Kbps128-byte pkt6.17 Mbps Up700 850 1000 1150 1300 1450 1600 1750 1900 2050Throughput (Kbps)Channel Utilization (%)1009080706050403020100128-byte pkt6.17 Mbps Up8 Kbps16 Kbps32 Kbps64 Kbps10 35 60 85 110 135 160 185 210 235 260 285 310 335Number of Cable ModemsThroughput (kbits/sec)440040003600320028002400200016001200800400128b_Fxd512b_Fxd128b_Rsv512bb_Rsv64Kbps streams6.17Mbps UpstreamFixed & Rsrv. Access512-byte Pkt128-byte PktRsrvSlots10 15 20 25 30 35 40 45 50 55 60 65 70 75 80Number of Cable ModemsFxdSlotf) Maximum number of streams supported for different isochronous streams and packet sizesStreams 8 Kbps 16 Kbps 32 Kbps 64 Kbps 128 KbpsPk Size Rsv Fxd Rsv Fxd Rsv Fxd Rsv Fxd Rsv Fxd64 byte 130 352 67 176 32 88 ----- 44 ----- -----128 byte 230 469 116 234 56 117 26 58 ----- 29256 byte 300 >500 144 234 70 117 35 58 17 29512 byte 360 >500 194 256 95 128 48 64 24 321024 byte 325 >500 155 256 85 128 42 64 21 32Figure E. 2 – Performance analysis of isochronous streams for different packet sizes,using the exponential backoff algorithm and a 6 Mbps upstream channel.A-xv