Re: SAT-3 / WASC

[S Woodside <sbwoodside at yahoo.com>]

(resending to afnog due to DSBL bounce)

On Saturday, May 31, 2003, at 03:54  PM, Brian Candler wrote:
> On Sat, May 31, 2003 at 12:36:38PM -0700, S Woodside wrote:
>> Here's a breakdown of the end traceroute from Europe, N.A.,
Australia
>> to the site. Note that the jump from BT's concert.net delay of 100
ms
>> to telkom where it's 274 ms delay. Only 175 ms increase - that's not
a
>> satellite hop! The speed of light in fibre is about 200 000 000 m/s 
>> and
>> the SAT-3 is about 15 000 000 m long so that about 75 ms lost just
to
>> the speed of light. I suppose the other 100 ms comes from the 
>> repeaters
>> or something.
>
> Traceroute measures a round-trip delay: the total time for there and 
> back.
> (Or did you already double the SAT-3 length to take account of that?)

Nope, that would be it ;-) The 15 000 km length is just one way. So in 
that case the time is pretty close to the simple loss to speed of
light.

simon


=====
www.simonwoodside.com

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