[Sls-slp] Re: Prox-1 DLL book review extended through Sunday Dec. 11, 2011

Wed Dec 7 00:20:36 UTC 2011

Enrico,

All of your comments are reasonable and I have accepted them.  I am checking with the Electra team about the 1000 sps rate. I will let you know soon. Once I get a confirmation I will update the book and send the reference to all.

Best regards,

Greg

From: "Enrico.Vassallo at esa.int<mailto:Enrico.Vassallo at esa.int>" <Enrico.Vassallo at esa.int<mailto:Enrico.Vassallo at esa.int>>
Date: Tue, 6 Dec 2011 03:22:03 -0800
To: "Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov<mailto:greg.j.kazz at jpl.nasa.gov>>
Cc: "Massimo.Bertinelli at esa.int<mailto:Massimo.Bertinelli at esa.int>" <Massimo.Bertinelli at esa.int<mailto:Massimo.Bertinelli at esa.int>>, "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>>, "Xavier.Enrich at esa.int<mailto:Xavier.Enrich at esa.int>" <Xavier.Enrich at esa.int<mailto:Xavier.Enrich at esa.int>>, "marjorie at delandelong.com<mailto:marjorie at delandelong.com>" <marjorie at delandelong.com<mailto:marjorie at delandelong.com>>
Subject: Re: Prox-1 DLL book review extended through Sunday Dec. 11, 2011

Greg,

I still have two problems with the data rate sections and in particular with the table giving coded symbol and date rates.

I take as example the Transmitter Data Rate section A1.2.3.5 but the comments apply also to the two other sections(Receiver Data Rate and Set PL) where these data rates are repeated.

The table shows that 4096000 sps could correspond to 4096000 bps in the uncoded case. However, this option has been removed from the list of possible modes since 4 Msps can only be generated after encoding. Therefore, the last line of the table should have a N.A. in the second column.

The second problem is with 1 kbps. According to your table, this data rate is always encoded and therefore the minimum coded symbol rate is 2 ksps. This is inconsistent with the PL book that starts with 1 ksps. If 1 ksps can be transmitted (please advise if this mode is implemented - the ESA equipment cannot), then we need to add a line to the table showing 1000, 1000, N.A., N.A. in the four columns.
If it is not required, then we need to change the PL book by removing the 1 ksps data rate and changing "13 values" to "12 values" in the relevant text of the same book.

Additionally, I also have comment aimed at avoiding RIDs during agency review. I understand the system now and so I can live with it. However, somebody else may be confused.
The table of the data rates is repeated in 3 different sections and is identical. However, two sections deal with the "standard" data rates (2, 4, 8, 16, 32, 64, 128 and 256 kbps) while one makes also available the other data rates (1, 512, 1024 and 2048 kbps) by the PL extension command. A note is added in the first two sections stating "1, 512, 1024, and 2048 kbps data rates can be selected using the SET PL EXTENSIONS directive, see A.1.7.".
I would propose adding the word "only" between "can" and "be selected" and copying this text also below the two first occurrences of the same table.

With this I have no further comments. It's been a painful exercise but fruitful.

Thanks to you, Matt and the others for the mutual understanding of each other's problems.

Enrico

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:     "Enrico.Vassallo at esa.int<mailto:Enrico.Vassallo at esa.int>" <Enrico.Vassallo at esa.int<mailto:Enrico.Vassallo at esa.int>>, "Massimo.Bertinelli at esa.int<mailto:Massimo.Bertinelli at esa.int>" <Massimo.Bertinelli at esa.int<mailto:Massimo.Bertinelli at esa.int>>, "Xavier.Enrich at esa.int<mailto:Xavier.Enrich at esa.int>" <Xavier.Enrich at esa.int<mailto:Xavier.Enrich at esa.int>>
Date:   30/11/2011 19:05
Subject:        Prox-1 DLL book review extended through Sunday Dec. 11, 2011

________________________________

Dear SLP,

Based upon some recent discussions with the RF&MOD chairman, I have updated parts of Annex A and Annex E (RF&Mod associated changes).
Please see the lastest version of the DLL book in the CWE (filename: Proximity1 DLL Nov 29 2011). Both the clean copy as well as the red lined copy are contained below at the following URL: http://tinyurl.com/3n9qx9r

Given the short amount of time that these new updates have been placed upon the CWE, the CCSDS internal review of this DLL book has been extended through the end of day Sunday Dec 11, 2011. Thereafter my plan is to send the DLL book to Tom Gannett so that he can prepare it for Agency Review to be held before the Spring 2012 meeting.

Best regards,

Greg Kazz
Chairman SLS-SLP WG

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