[181480] in North American Network Operators' Group
Re: Residential VSAT experiences?
daemon@ATHENA.MIT.EDU (William Herrin)
Fri Jun 26 13:26:24 2015
X-Original-To: nanog@nanog.org
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In-Reply-To: <CAH_OBif2AKeYCRU5710W7LNbZR2S_-W=C0MOi_7wdiQ2jtCy5Q@mail.gmail.com>
From: William Herrin <bill@herrin.us>
Date: Fri, 26 Jun 2015 13:25:57 -0400
To: shawn wilson <ag4ve.us@gmail.com>
Cc: North American Network Operators Group <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Fri, Jun 26, 2015 at 1:19 PM, shawn wilson <ag4ve.us@gmail.com> wrote:
> On Jun 22, 2015 6:14 PM, "William Herrin" <bill@herrin.us> wrote:
>> Two-way satellite systems based on SV's in geostationary orbit (like
>> the two you're considering) have high latency. 22,000 miles out,
>> another 22,000 miles back and do it again for the return packet.
>
> Just a minor nitpick - that's 22,300 miles above the equator at sea level.
> You're probably closer to 22,500 miles away from the bird (as could your
> uplink). That's just rough math adding the tangent of 1500 miles from the
> equator in my head (plus the tangent of the curve distance from that base
> line and angle of the bird :) ).
Typically further than that because you're not only not at the same
latitude as the bird, you're not at the same longitude either.
If you want to nitpick. ;)
-Bill
--
William Herrin ................ herrin@dirtside.com bill@herrin.us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
