[45870] in North American Network Operators' Group
Re: Satellite latency
daemon@ATHENA.MIT.EDU (Steven M. Bellovin)
Tue Feb 26 21:07:38 2002
From: "Steven M. Bellovin" <smb@research.att.com>
To: "Tim Devries" <zsolutions@cogeco.ca>
Cc: nanog@merit.edu
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Date: Tue, 26 Feb 2002 21:07:14 -0500
Message-Id: <20020227020714.544D07B4B@berkshire.research.att.com>
Errors-To: owner-nanog-outgoing@merit.edu
In message <014d01c1bf3b$44bfca00$ea9a8d18@evilinc>, "Tim Devries" writes:
>
>Hello,
>
>I think this question may have been asked before, but what is the minimum
>latency and delay I can expect from a satellite connection? What kind of
>delay have others seen in a working situation? What factors should be
>considered in end to end connectivity architecture when utilizing a
>satellite link?
>
>Any help appreciated,
Geosynchronous orbit is about 36,000 km from the center of the earth.
Round-trip to the satellite is ~72,000 km; the speed of light is
300,000 km/sec. That works out to 240 milliseconds at the minimum for
one-way packet delivery.
--Steve Bellovin, http://www.research.att.com/~smb
Full text of "Firewalls" book now at http://www.wilyhacker.com
