[Sis-csi] More endpoints and data flows

[Keith Hogie]

Fred and Chris,

   Thanks for the inputs.  That's exactly the sort of information
I'm looking for right now.  I am not aware of all the ideas people
are working on for future missions so I am looking for anyone's
ideas.

   I have been thinking about what to do with this information and I
just started a spreadsheet to try to collect more details and be
able to sort them.  I'm looking for ways to capture all possible
endpoints and also associate other attributes with each one.  Then
we should be able so sort the information and look for various
categories of data flows.  I think we need to get a better picure of
the types of data flows before we start trying to apply solutions.

   Here are the current attributes I am adding to the spreadsheet
to try to capture more information.  Each endpoint should identify
the following characteristics that define both the endpoint and its
data flows:

Endpoint Characteristics
============================
Manned / Un-Manned
Stationary / Mobile
Earth surface / Space / Lunar surface



Data Flow Characteristics  (these are from a user application view)
=========================  (they are not related to protocols yet)
File transfers
Real-time telemetry  (atomic packets)
Streaming data       (single packets not useful)

Data rates

Data sensitivity to delay  (this is for the data, not protocols)
Data sequence sensitivity  (does order matter)
Data loss sensitivity      (do missing packets matter)

Security  (high, medium, low, none, ?)

Quality of Service  (this may be covered in the sensitivity items)


   Everyone please think about these characteristics and see if you
can identify more that would help characterize all possible
endpoints and user data flows.  Also, I'm not too sure about the
actual definition of things like sensitivity yet.  Maybe we just
have a high, medium, low for now and see what the does.

   Remember that this is not trying to identify protocols or
solutions yet.  Right now I am trying to identify all endpoints
and the types of data flows their users need to support their
missions.  Once we have a better idea of the users needs we
can start looking for solutions.

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   Keith Hogie                   e-mail: Keith.Hogie at gsfc.nasa.gov
   Computer Sciences Corp.       office: 301-794-2999  fax: 301-794-9480
   7700 Hubble Dr.
   Lanham-Seabrook, MD 20706  USA        301-286-3203 @ NASA/Goddard
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