Hi,
On Wed, 17 Dec 1997, Fred Baker wrote:
> At 3:51 PM +0000 12/17/97, Sam Critchley wrote:
> >I guess what I'm asking whether
> >a connection is going to be changing relatively slowly (ie over a few
> >hundred seconds) or very rapidly (over a couple of seconds).
>
> A given route is likely to hop from bird to bird on the order of every
> minute or two, I would expect. The important question here is the duration
> of the session. If it's a few seconds, then probability of a jump is
> relatively small; if it's on the order of minutes, the probability
> approaches one.
So, for eg FTP this could be slightly problematic, although I wouldn't
imagine it would cause extreme difficulties if it's only happening once
every minute or two. Of course, the change in latency might have quite an
effect on the session (wouldn't it?).
>
> >Also, does anyone know who is writing the inter-satellite routing
> >protocols and how to get on some sort of mailing-list about them
>
> At the moment, they are a Teledesic proprietary protocol.
There must be some really interesting stuff to deal with in there - is
there anyone from Teledesic who'd be willing to share a little with us?
I'd imagine they'd have to add all sorts of metrics into the decision,
such as power differences between sending to a nearby satellite and
sending to one that's far away, being able to route around busy parts of
the sky, all on top of a constantly changing table based on neighbours
that are moving in relation to each other. Others?
Also, is anyone able to explain to me anything about what SAIS is and how
it works? It seems to have been allocated a few TCP and UDP ports but I
don't know anything about it. I would love it if someone could explain it
to me (taking it off the mailing list if it's not at all relevant to
tcpsat..).
Thanks again,
Sam
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