nanog mailing list archives
Re: ATM (was Re: too many routes)
From: Vadim Antonov <avg () pluris com>
Date: Fri, 12 Sep 1997 14:05:34 -0700
Richard Irving wrote:
Nathan Stratton wrote:On Thu, 11 Sep 1997, Vadim Antonov wrote:Quote from Jim Steinhardt's <jsteinha () cisco com> personal message:a) light is slower in dense mediaThe index of refraction of glass is 1.5 vs 1.0 for a vacuum. Hence, the speed of light in glass is 2 * 10 **8 m/s.That gives 60 ms RTT on 4000 mile line. Case closed.Yep, but you also need to add a few ms for electronics in that 4000 mile line.My original point. (Concerning latency)
You didn't understand, did you? All your calculations were to disprove Sean's point that the electronics and switching delays are pretty small (so as to be insignificant) as compared to the signal propagation delay. Your (wildly inaccurate) estimate was that more than 50% of time is spent in electronics. The real figures, however, show that it is at most 5%. I strongly suspect that if you figure in that fibers aren't going in straight line, you'll get that down to 0.1-0.5%. --vadim
Current thread:
- Re: Physical transport media, (continued)
- Re: Physical transport media Michael Dillon (Sep 16)
- Re: Physical transport media Rob Barron (Sep 16)
- Message not available
- Re: Physical transport media Jay R. Ashworth (Sep 16)
- Message not available
- Re: NANOG-PHYSICS (was Re: ATM (was Re: too many routes)) Geoff Huston (Sep 15)
- Re: ATM (was Re: too many routes) Randy Bush (Sep 18)
- Re: ATM (was Re: too many routes) Tim Pozar (Sep 15)
- Re: ATM (was Re: too many routes) Sean M. Doran (Sep 11)
- Re: ATM (was Re: too many routes) Vadim Antonov (Sep 11)
- Re: ATM (was Re: too many routes) Nathan Stratton (Sep 12)
- Re: ATM (was Re: too many routes) Richard Irving (Sep 12)
- Re: ATM (was Re: too many routes) Vadim Antonov (Sep 12)
- Re: ATM (was Re: too many routes) Richard Irving (Sep 12)
- I found the missing 30 milliseconds! Kent W. England (Sep 16)
- Re: I found the missing 30 milliseconds! Craig A. Huegen (Sep 16)
- Message not available
- Re: I found the missing 30 milliseconds! Jay R. Ashworth (Sep 16)
- Re: I found the missing 30 milliseconds! Taner Halicioglu (Sep 16)
- Re: I found the missing 30 milliseconds! Kent W. England (Sep 17)
- Re: ATM (was Re: too many routes) Robert E. Seastrom (Sep 12)
- Re: ATM (was Re: too many routes) Michael Dillon (Sep 12)
- Re: ATM (was Re: too many routes) Dorian R. Kim (Sep 12)
- Re: ATM (was Re: too many routes) Tony Li (Sep 12)