At 01:52 PM 6/14/02 +0100, Lloyd Wood wrote:
>On Thu, 13 Jun 2002, David Carek wrote:
>
> > I'm looking for existing satellites that use IP or other Internet
> > protocols on board or in their air to ground communications. .....
>
>
>Really, isn't this what NASA et al. have been developing SCPS for?
>
>L.
Does anyone know of someone "flying" an onboard SCPS stack?
Does anyone know of any commercial applications that call the SCPS-TP
options. SCPS-FP is the only application one I know of.
Does anyone know of a commercial vendor implementing a SCPS-NP router? To
take full advantage of some options in SCPS-TP, one needs as SCPS-NP router.
We performed high-speed testing those SCPS options we could test and found
no significant performance improvements.
The report is being written, but not yet available. The results were
presented as the 2nd Space Internet Workshop in June and will be
presented at SpaceOps 2002.
http://roland.grc.nasa.gov/~ivancic/papers_presentations/papers.html
Under PRESENTATIONS
"SCPS-TP, TCP and Rate-Based Protocol Evaluation," (Includes multi-flow
data) SpaceOps 2002 at Houston, TX, October 9-12, 2002 (Powerpoint) file
size 951,808 bytes
By the way, SCPS-TP advertises TCP's protocol number for reliable transport
protocol selections. It does this even if the pure rate-based transmission
is used. IMO, this is terrible as it make QoS and queue management very
difficult. I may be putting a rate-based protocol into a WRED
queue. Guess who loses.
Will
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