[43160] in North American Network Operators' Group
Re: Long haul latency calculation?
daemon@ATHENA.MIT.EDU (Steven M. Bellovin)
Sun Sep 30 22:27:43 2001
From: "Steven M. Bellovin" <smb@research.att.com>
To: chris@bblabs.com
Cc: nanog@merit.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Sun, 30 Sep 2001 22:26:01 -0400
Message-Id: <20011001022601.842BB7BFE@berkshire.research.att.com>
Errors-To: owner-nanog-outgoing@merit.edu
In message <200109301909.AA29032658@mail.turbonet.net>, "Christopher Wolff" wri
tes:
>
>Dear Nanog:
>
>I was wondering if there is a benchmark for long-haul circuit latency... For
>example if I had a T1 circuit with 2900 miles between the two end-points (and
>assuming the provider is best case scenario) can I do something like (miles*la
>tencyfactor) = 5 ms for 2900 miles?
It's called "speed of light lag"... If I recall correctly,
the speed of light in fiber is about .65c, where c is the speed of
light in a vacuum (300,000 km/sec).
--Steve Bellovin, http://www.research.att.com/~smb
http://www.wilyhacker.com
