this post is a side bar to the main P2P article.
network caps. please note that there is a difference between bandwidth size limits and bandwidth rate limits. how are these different?
now i understand that they should be charging more for people with a faster network pipe (which they already do). they have T-1, T-3, OC-3, OC-12, OC-48 and OC-192 dedicated lines. and they come with (most of the time) unlimited transfer sizes. remember, it's a dedicated line. (and i say most of the time because, for example, it seems to be regional for academic institutions. who knows why - maybe some crazy legislation is why. see my previous article.)
in a nuttshell, the evil-telcos want to double charge you for the same product and services. here's what i mean. a T-1, for example, is a 1.544 megabits per second pipe. a T-3 is 43.232 Mbps, which has 28 times the capacity of the T-1. or in other words, it would take 28 times longer to push the same amount of data on a T-1 than on the T-3. (by the way, a T-3 is just 28 T-1's bundled together. and yeah yeah yeah, packet data [payload] versus packet header [overhead] bliz blaz.) but, keep this simple math in mind as we continue.
"there was also buzz that Comcast might try to charge customers $15 for every 10GB they went over the limit."
ok, back to the double charge and the basic math i mentioned earlier. most DSL and cable modem provider charge you a certain amount of dollars for a certain bandwidth rate.
AT&T DSL price quote as of Oct 19 2008 | ||
price | up stream | down stream |
$14.99 | 384 Kbps | 768 Kbps |
$25.00 | 384 Kbps | 1.5 Mbps |
$30.00 | 512 Kbps | 3.0 Mbps |
$35.00 | 768 Kbps | 6.0 Mbps |
let's say that you want to download a few files that totals to 250 GB - maybe it's every Linux Distro ISO and all of the source codes that were used to make it. let's see how long it would take to download it.
time to download 250GB | ||||
rate | days | hours | mins | secs |
768 Kbps | 32 | 8 | 43 | 22.67 |
1.5 Mbps | 16 | 13 | 40 | 55.77 |
3.0 Mbps | 8 | 6 | 50 | 27.88 |
6.0 Mbps | 4 | 4 | 25 | 13.94 |
so, on the slowest tier, it would take the whole month for you to download all of that. good for you! you physically can't download it fast enough to even hit the limit. but if you went and upgraded to the faster rate, not only will pay more for it, but will download it faster and faster and hit the "limit" quicker than the month would end. so you would be charged extra in order to keep using the internet feed you already paid for - or spend the rest of the month unable to access the internet. told you the telco's want to DP you in the @$$.
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