[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 A126.96.36.199 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
"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>
Prox-1 DLL book review extended through Sunday Dec. 11, 2011
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.
Chairman SLS-SLP WG
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