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

Enrico.Vassallo at esa.int Enrico.Vassallo at esa.int
Tue Dec 6 11:22:03 UTC 2011


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 

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 
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 

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


"Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov>
"sls-slp at mailman.ccsds.org" <sls-slp at mailman.ccsds.org>
"Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>, 
"Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>, 
"Xavier.Enrich at esa.int" <Xavier.Enrich at esa.int>
30/11/2011 19:05
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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