[Sls-slp] Proposed update to Prox-1 GB (CCSDS 210.0-G-2)

[Marco.Rovatti at esa.int]

Hi Greg, 

Thank you so much for providing the updated figure and GB text. 

As for the updated figure, I'm OK with it.

Regarding the new text I would propose the following adjustment:

From : Upon successful receipt of the hail, the responder changes both its 
receive frequency to Rw1 and its transmit frequency to Tw2 and turns on 
its transmitter.
To: Upon successful receipt of the hail, the responder changes its receive 
frequency to Rw1, turns on and configures its transmitter to transmit on 
the working channel Tw2.



Best regards
Marco 




From:   "Kazz, Greg\(US 312B\) via SLS-SLP" <sls-slp at mailman.ccsds.org>
To:     "Kazz, Greg (US 312B) via SLS-SLP" <sls-slp at mailman.ccsds.org>
Cc:     "Shihabi, Mazen M\(US 337K\)" <mshihabi at jpl.nasa.gov>
Date:   29/06/2022 03:08
Subject:        [Sls-slp] Proposed update to Prox-1 GB (CCSDS 210.0-G-2)
Sent by:        "SLS-SLP" <sls-slp-bounces at mailman.ccsds.org>



Dear SLP WG,
 
The purpose of this email is to fix an inconsistency in the Prox-1 Green 
Book, to make it consistent with the normative Prox-1 Blue Book. Please 
see the attached power point file for these changes. Please review the 
changes in the attached power point file and let me know if you find any 
problems/issues. I’d like to get your feedback by July 15. I plan to 
present this change (and any modifications we come up with beforehand) at 
our Fall 2022 meeting, so that the Prox-1 GB can reflect this change this 
year. It is probably easier when evaluating this change to simply print 
out the “current’ and “proposed” figures. I will upload this file to the 
CWE directory soon.

An inconsistency between the Prox-1 Space Data Link Protocol Blue Book 
(CCSDS 211.0-B-6) and the Prox-1 GB (CCSDS 210.0-G-2) was brought up to me 
by the NASA Mars Program. The inconsistency exists in the current Prox-1 
Green Book in Section 4.1.3 and the accompanying Figure 4-3. The 
inconsistency is that the Green Book states and shows that when a user 
chooses to immediately move from the hailing channel and on to a working 
channel, there is an incorrect intermediate step in which the first frame 
transmitted by the responding node is currently documented as using the 
hailing channel. This is in contrast to what is documented in the relevant 
Prox-1 blue book state table and figure that defines this activity in 
Section 6.4.2, Figure 6-1 and Table 6-7. (Note that NASA’s Electra 
transceiver, both Orbiter and lander versions comply with the Prox-1 Blue 
Book in this regard). See next paragraph.

[Prox-1 Blue Book ] In event E3 in Table 6-7, when the responder receives 
the hailing directives, it is stated that the receiver and transmitter 
parameters are set as per the hail directives. Therefore the responder 
changes its transmitter to the working frequency. Note that this event 
happens before the responder sends its first frame back to the caller. The 
consequence in this case is that the responder sends the first frame on 
the working frequency, and the caller must change its receiver to the 
working frequency beforehand.
 
[Prox-1 Green Book] In section 4.1.3 and figure 4-3, I’ve taken a stab at 
updating both the figure and the text to match the Prox-1 blue book.
 
Best regards,
Chair SLP WG
 
Greg Kazz
Principal Engineer
Technical Group Supervisor,
312B Project Protection, Project Software, and End to End Information 
System Engineering
Jet Propulsion Laboratory
4800 Oak Grove Dr., M/S 301-490
Pasadena, CA 91109
1+(818)393 6529(voice)
1+(818)393 6871(fax)
email: greg.j.kazz at jpl.nasa.gov 
 [attachment "fd_link_est2_wc_GB_June_28_2022.ppt" deleted by Marco 
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