T3 or so I would say for a SMALL isp... figure on each of those little modem boys pullin 56kb/s down, times 700, plus 10% (VERY generous) overhead, gives you somewhere around 35mb/s maximum used bandwidth. Phone lines, you are going to need a shitload... you don't want people to get busy signals, so I would say 85% of customers, given that 25% won't be on when the rest will.....My friend and I have been talking about setting up an ISP at school and I have also thought about it for a while. But what hardware, and how many phone lines would be required (Maybe some ratio as a rule?) Also, how big would a fat pipe to the net need to be for a small to medium ISP? (Maybe 100-500 customers?) I'm just chucking ideas around for the moment but I may seriously think about doing it if it looks alright.
anyway, I'm mostly pulling numbers out of my ass, take them as you will.