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

Wed Jun 29 15:12:09 UTC 2022

Hi Marco,

Sounds good. I will add your revision to the proposal.

Thanks and best regards,
Greg

From: "Marco.Rovatti at esa.int" <Marco.Rovatti at esa.int>
Date: Wednesday, June 29, 2022 at 3:35 AM
To: "Kazz, Greg (US 312B)" <greg.j.kazz at jpl.nasa.gov>
Cc: "Shihabi, Mazen M (US 337K)" <mshihabi at jpl.nasa.gov>, "Kazz, Greg (US 312B) via SLS-SLP" <sls-slp at mailman.ccsds.org>, SLS-SLP <sls-slp-bounces at mailman.ccsds.org>
Subject: [EXTERNAL] Re: [Sls-slp] Proposed update to Prox-1 GB (CCSDS 210.0-G-2)

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

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