[CESG] New version of the CCSSD Strategic Plan / Transfer frame format for Optical Links

[Gian.Paolo.Calzolari at esa.int]

Peter's comment 
I question if we want to state outright that we will develop an new 
optical comm link layer instead of figuring out how we might make the new, 
unified, "Space Data Link Protocol integrating the best features of TM, 
TC, AOS, and Proximity-1 and providing a common link layer transfer frame 
format able to satisfy future space data link needs" do the job.  There is 
also in SLS what looks like a MOIMS-style data exchange spec for weather 
that I thought was already under discussion within the Nav WG, but I might 
be mistaken. 
[Nestor] To be discussed at Bordeaux.

Peter, 
        the current SLS goal for Optical links is stated as follows.

a       To create new standards for optical links (ISO layers 1&2) support 
other areas as needed in adapting/creating standards for e.g. service 
management, higher layers protocols, best practices, ? to accommodate 
optical communications needs.
i.      By 2018 agree the basic characteristics of optical terminals;
ii.     By 2020 develop standards for modulation and coding for return 
links;
iii.    By 2020 identify means to adapt existing or planned data link 
protocols or develop new optical communication-specific protocols for 
optimizing communications over optical links.
iv.     By 2020 identify and define if necessary standards for data 
exchange of forecasts and meteorological data from ground sites relevant 
for optical communication.
v.      By 2025 develop standards for combinations of modulation and 
coding for channel-dependent effects considering e.g., first VCM and then 
ACM techniques;
vi.     By 2025 develop standards for modulation and coding for forward 
links.


The  unified, "Space Data Link Protocol integrating the best features of 
TM, TC, AOS, and Proximity-1 and providing a common link layer transfer 
frame format able to satisfy future space data link needs" is just a 
proposal with no approved project. Discussion in SLS is ongoing and of 
course it may be decided to start a project and eventually to use that 
protocol also for optical links.

I think the current text for bullet "iii" is completely correct and 
consistent with this possibility.

Bullet "iv" can indeed look  as a <MOIMS-style data exchange spec>. 
However what is important is that the need for such data and the 
characteristics of such data would identified within SLS by the optical 
experts. Eventually the real spec could even be finalized outside SLS.

More details can of course be discussed in Bordeaux.

Regards

Gian Paolo

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