On Fri, Nov 30, 2001 at 03:23:45AM +0100, Pierre Beyssac wrote: > I can't reproduce this result, 16K fills a T1 for 11 ms, which is > 22000 km (at 2/3 of light speed), enough to get halfway round the > earth...
Your math is a little funny. 4000 km New York to LA c = 300,000 km/sec Speed of light in fiber, approximately .66 c, or 198,000 km/sec. Approximate sum of buffering + serialization delay in the network, is a 15% penalty, or 168,300 kph. total speed. 4000 km one way == 8000 km two way, 8000 / 168300 = 47ms in my book, theoretial optimum. With an RTT of 47ms, you can move 16k per RTT, or or about 340k/sec. * If you find a cross country RTT of 47 ms I'll personally send you $20. around 60-65 is normal for "good circuits", and 70-90 is not wholely unusual. * The 340k/sec assumes perfect network conditions, that is no dropped or delayed packets. Please search the archives. There are reams of information about this. -- Leo Bicknell - [EMAIL PROTECTED] - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/ Read TMBG List - [EMAIL PROTECTED], www.tmbg.org To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message