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ATHM 24.95

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Nov 4 3:59 PM EST

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To: Sam Citron who wrote (238)	7/5/1997 3:59:00 PM
From: Jon Tara	of 383

Sam, that article over-simplified, as do many about this subject. You cannot do a simple calculation based on either the number of people logged-on OR the number of people doing uploading and downloading. You have to assume an average idle percentage if you want to come up with a simple answer. It's very similar to calculating available bandwidth on an Ethernet LAN, EXCEPT that there is no possibility of collisions. It's determined by instantaneous bandwidth demand/available bandwidth, limited by the available bandwidth of the upstream source. You can get an approximation for downstream by: avg load = 1.0 - avg %idle/100 throughput = node bandwidth / (# of people downloading * avg load) (This formula isn't accurate at very low loads, with very low # of people downloading, because of the 10Mbit/sec limitation of the computer interface.)

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