[83676] in North American Network Operators' Group

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Re: Question about propagation and queuing delays

daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Sun Aug 21 22:04:04 2005

To: David Hagel <david.hagel@gmail.com>
Cc: Richard A Steenbergen <ras@e-gerbil.net>, nanog@merit.edu
In-Reply-To: Your message of "Sun, 21 Aug 2005 18:38:32 PDT."
             <c6ae07ec05082118384b9ce10a@mail.gmail.com> 
From: Valdis.Kletnieks@vt.edu
Date: Sun, 21 Aug 2005 22:00:12 -0400
Errors-To: owner-nanog@merit.edu


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On Sun, 21 Aug 2005 18:38:32 PDT, David Hagel said:

> Would there be any data out there on what fraction from this 60ms to
> 80ms RTT is raw propagation delay and what fraction is typical packet
> queuing delay at intermediate switches? Does queuing delay play much
> of a role at all these days? Or is it all just propagation delay?

Measure the distance, figure the signal is moving at 60% of the speed
of light, and anything over that is queueing/switching delay.

This of course assumes that you have some idea how the cable runs....

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