From greg.j.kazz at jpl.nasa.gov  Wed Jun  7 17:51:24 2006
From: greg.j.kazz at jpl.nasa.gov (Greg Kazz)
Date: Wed, 07 Jun 2006 10:51:24 -0700
Subject: [Sls-slp] Draft Green Books for Review
Message-ID: <6.2.0.14.2.20060607101751.03183d20@mail.jpl.nasa.gov>

SLS-SLPers,

I have uploaded two updated draft green books from Takahiro Yamada, which I 
plan to discuss during the SLS-SLP meeting in Rome.

These are the 1) Overview of Space Communications Protocols GB (used to be 
called space link protocols, which was an overloaded word) and 2) Space 
Data Link Protocols GB



Please review them (including Takahiro's responses to the comments made in 
the separate word documents), so that we can all be prepared for the 
discussion at the SLS-SLP meeting.

The files are on the CWE in the public document library in the 
June_Rome_2006 folder:

The URL is 
http://public.ccsds.org/sites/cwe/sls-slp/Public/Forms/AllItems.aspx?RootFolder=%2fsites%2fcwe%2fsls%2dslp%2fPublic%2fJune%5fRome%5f2006&View=%7b87F1CDDB%2d6E51%2d4D2E%2dAA92%2dFBBB8578ECF6%7d

thanks in advance for putting in the time to review these documents,

Greg Kazz
Chairman CCSDS SLS-SLP WG





From greg.j.kazz at jpl.nasa.gov  Thu Jun  8 16:10:04 2006
From: greg.j.kazz at jpl.nasa.gov (Greg Kazz)
Date: Thu, 08 Jun 2006 09:10:04 -0700
Subject: [Sls-slp] Results of CESG Poll on Prox-1 Data Link Pink Sheets
Message-ID: <6.2.0.14.2.20060608090611.02f79510@mail.jpl.nasa.gov>

All,

Below are Bob Durst's (SIS area) comments on the proposed change to Prox-1 
data link to the frame selection rules. (see below)

We need to consider this performance issue along with any other additional 
performance issues that we feel need to be incorporated into the Prox-1 GB. 
I look forward to that discussion with you in Rome.

regards,

Greg Kazz
Chairman SLS-SLP WG

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CESG E-Poll Identifier:  CESG-R-2006-05-002:  Approval of  update to 
Proximity-1 Space Link Protocol--Data Link Layer Blue Book
Results of CESG poll beginning 12 May 2006 and ending 26 May 2006:

Total Respondents:  3

No response was received from the following Area(s):

      MOIMS
      CSS
      SOIS

SECRETARIAT INTERPRETATION OF RESULTS:  Failed to achieve quorum
PROPOSED SECRETARIAT ACTION:            To be determined


                  ABSTAIN:  0 (0%)
  APPROVE UNCONDITIONALLY:  2 (66.67%) (Shames, Moury)
  APPROVE WITH CONDITIONS:  1 (33.33%) (Durst)
  DISAPPROVE WITH COMMENT:  0 (0%)

CONDITIONS/COMMENTS:

      Bob Durst (APPROVE WITH CONDITIONS):  It's really hard to review this 
without the Green Book.  I pulled the green book from the SLS site, but 
don't really know how current/complete it is.  My main concern is that the 
Frame Selection scheme in section 4.1.2.2 is complex.  I don't have a feel 
for the types and amounts of traffic that might be present in each of the 
five categories listed, and so I cannot judge how effective this scheme 
might be across the range of environments in which Prox-1 might be 
deployed.  I hoped to see some verification that this scheme would not 
result in either data or control frame starvation, but didn't see it.  I 
encourage the authors of the green book to include some analysis of this 
frame selection scheme in the updated green book (and to be really, really 
sure that it works the way that you expect it to...).

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