[Css-csts] definition of the term "managed parameters"

[Stoloff, Michael J (393A)]

John,

It should be noted that some CCSDS documents already have a slightly
different definition of the meaning of a “managed parameter.”  For
example, [CCSDS 131.0-B-2] states:

"In order to conserve bandwidth on the space link, some parameters
associated with synchronization and channel coding are handled by
management rather than by inline communications protocol.  The managed
parameters are those which tend to be static for long periods of time, and
whose change generally signifies a major reconfiguration of the
synchronization and channel coding systems associated with a particular
mission.  Through the use of a management system, management conveys the
required information to the synchronization and channel coding systems.”
[CCSDS 131.0-B-2, section 11.1, page 11-1]

The managed parameter of the above passage is defined by specific
reference to the space link Physical Channel, as in this passage that
discusses whether pseudo-randomization is present or not:

“The presence or absence of pseudo-randomization is fixed for a Physical
Channel and is managed (i.e., its presence or absence is not signaled in
the transmitted data stream but must be known a priori) by the receiver.”
[CCSDS 131.0-B-2, section 9.1, page 9-1]

The definition that you suggest appears to be a generalization of the same
concept, but the two definitions do not seem quite the same from my point
of view.  I do not object to overloading the term and having both
definitions if that makes the most sense, but neither do I wish to see the
specificity of the original definition lost.

—Best regards,
 Michael


On 11/5/15, 8:20 AM, "css-csts-bounces at mailman.ccsds.org on behalf of John
Pietras" <css-csts-bounces at mailman.ccsds.org on behalf of
john.pietras at gst.com> wrote:

>CSTSWG colleagues ---
>In his detailed review of last July's draft of the TD-CSTS book, Sylvain
>asked for a definition of the term "managed parameter", a term that he
>did not find in the CSTS SFW (see below).
>
>Actually, it *does* appear once in the CSTS SFW, in section 2.3. However,
>it is easy certainly easy to miss that. Since every CSTS specification
>will likely have to deal with determining which (if any) configuration
>parameters are designated as managed parameters, I suggest that we add
>the term to section 1.6.1.4 of the CSTS SFW. My proposed definition would
>be something like:
>Managed parameter - A configuration parameter for which the value is set
>by Service Management.
>
>Conveniently, we will be having a meeting next week where we can discuss
>this! 
>
>Best regards,
>John 
>
>-----Original Message-----
>From: Sylvain Gully [mailto:Sylvain.Gully at dlr.de]
>Sent: Thursday, September 10, 2015 4:38 AM
>To: John Pietras; CCSDS CSTS Working Group
>Subject: Review of TD-CSTS_W-0-10-15721
>
>Hello John,
>
>I reviewed the update of the TD-CSTS_W-0-10-15721 you put on the CWE on
>21.07.
>I made the review with the FW-CSTS_921x1r2 20150708 (that has already
>changed a bit since).
>I hope it helps making the document ready for prototyping.
>
>Comments:
>----------------
>
>
>...
>- chap 5.2 page 5-1 and chap 5.3 page 5-1: these chapters speak about
>"managed parameter". There is no description or reference to the FW-CSTS
>that explains this notion. Could you add this somewhere?
>...
>
>Best Regards,
>Sylvain
>
>
>