reply to tanzam75
Re: Problem MATH
said by tanzam75:Well, presumably the higher price of the service would fund infrastructure upgrades to allow them to offer a lower contention ratio than they otherwise could. Business class service can also be prioritized over residential service during times of congestion. I'm not sure if Comcast does this but I know my provider (Frontier) does.
Clearly, then, $100 per month business-class service depends on some degree of statistical multiplexing. You simply cannot max out the line without impacting other customers on the same node.
Another consideration is that most businesses care more about latency than they do about sustained transfer rates. They need webpages to load snappily, VoIP to work, VPNs to work, RDP to work, etc, etc. Online backups are about the only thing a typical business would need sustained data transfer speeds for, but even that isn't really a consideration, most online backups are incremental, and they can be scheduled to occur during off-peak times. Additionally, many businesses would care more about the upstream than the downstream, they need it for road warriors and the like. Torrent kiddies notwithstanding, the upstream side of the equation is underutilized in most ISP networks, so the contention ratio is less of a concern there.
My employer shares a connection with 55-60 employees; in the last four weeks we've used 78.21GB down and 26.55GB up. Our 95th percentile is 1.09mbit/s, meaning that 95% of the time we were using less bandwidth than that. Most employers would be even lower on the downstream, we've got classrooms that do a fair amount of video streaming, whereas most business entities really have no need for that.