Quick comments for PICS: [Sls-slp] Proximity-1 Data Link Specification for final SLP WG review

Tue Sep 3 20:57:15 UTC 2013

G.P.

Thanks for your comments!

My answers are in **…. ** below.

------------------------------------------------------
Greg Kazz
EEISE Group Supervisor
Systems Engineering Section (Section 313)
Jet Propulsion Laboratory
4800 Oak Grove Drive, Pasadena  CA 91109
MS 301-490
(818) 393-6529 (office)
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From: "Gian.Paolo.Calzolari at esa.int<mailto:Gian.Paolo.Calzolari at esa.int>" <Gian.Paolo.Calzolari at esa.int<mailto:Gian.Paolo.Calzolari at esa.int>>
Date: Tuesday, September 3, 2013 3:59 AM
To: "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>>
Subject: Quick comments for PICS: [Sls-slp] Proximity-1 Data Link Specification for final SLP WG review

A few very quick comments.
Of course there may be more for similar cases.

regards

Gian Paolo
----------------------------------------------------

A2.2 PICS
Should DLL-1 better refer to 3.2.1 instead of 3.2?
** Yes 3.2.1 **

DLL-1 should be removed as individual subsections of 3.2 are addressed and moreover DLL-1 as it stands now is incorrect/confusing as it includes also options?
** We need users to comply with both 3.2.1 and 3.2.2. The subparts of 3.2.2. are useful to see because they contain valid values associated with these parameters. **

Why the description of Option 1 is with lower case o (i.e. o.1 instead of O.1 as in the table)? ** I think it was a typo. It was corrected as all capital letters in my version **
Why DLL-61 is in bold?   (this is not the only one in bold...) ** I think this is Tom's way of showing a heading. **

Is it correct to mark all the items within e.g. 5.4 as optional? ** Yes that was deliberately done by the WG **
If you read section 5.4, it contains mandatory requirements and options.
This was actually a case for conditional items as follows:
- DLL-63 / 5.4.2.1        Optional
- DLL-64 / 5.4.2.4        Mandatory if DLL-62 Supported
Is it correct giving up about conditional items in PICS? ** In this case, yes **

Moreover
DLL-61 / 5.4 should not be listed as the individual requirements are listed
DLL-63 should refer to 5.4.2.1 and not to 5.4.2 ** I agree, DLL-63 refers to 5.4.2.1 **
As section 5.4 is written, it is not visible that this feature is optional ==> should 5.4.1 be made optional? ** yes **

PICS take - as expected - several pages.
Why not shortening some cases as e.g. DLL-52 / 5.2 ?
In other words why not having only a row for DLL-52 and removing the 8 following rows?
Alternatively why not indenting the following 8 row and using identifiers as DLL-52.x?
** Up to Tom Gannett how best to deal with indexing or showing subsets of information within the PICS **
** We could shorten the DLL PICS, however I tried to strike a compromise between the shortest PICS Proforma possible vs conveying some redundancy that helps the user check through the items by listing the key ones in detail. If I hide too much information, people might have the tendency to forget about it. Explicitly listing it (but not regurgatating the entire text) seemed to be the best compromise **

**Thoughts from other SLP WG members ??? **

From:   "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>>
To:     "sls-slp at mailman.ccsds.org<mailto:sls-slp at mailman.ccsds.org>" <sls-slp at mailman.ccsds.org<mailto:sls-slp at mailman.ccsds.org>>
Cc:     Thomas Gannett <tomg at aiaa.org<mailto:tomg at aiaa.org>>
Date:   20/08/2013 00:14
Subject:        [Sls-slp] Proximity-1 Data Link Specification for final SLP WG        review
Sent by:        sls-slp-bounces at mailman.ccsds.org<mailto:sls-slp-bounces at mailman.ccsds.org>

________________________________

Dear SLP WG members,

Tom Gannett has provided us now with a pre-approval version for the CESG of the Proximity-1 Space Data Link Protocol.

Please review the attached documents and send me and Tom any comments you have (redlines of the clean version would work, if you have the bandwidth to send a 20 Megabyte file !) to me and Tom by Sept. 13.

There are two files in the CWE directory below. One is a red-lined version so that you can see the changes made and also a clean version.

http://tinyurl.com/kzjz38z

Best regards,

Greg
------------------------------------------------------
Greg Kazz
EEISE Group Supervisor
Systems Engineering Section (Section 313)
Jet Propulsion Laboratory
4800 Oak Grove Drive, Pasadena  CA 91109
MS 301-490
(818) 393-6529 (office)

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