[Sls-sea-dls] [EXTERNAL] SDLS EP GB figures 4-1, 4-2

[Gian.Paolo.Calzolari at esa.int]

Greg, Craig,
        my questionis that your diagrams seems to implicitly state that
1) Packets go to the Onboard Computer A
2) VC.MAP frames do not go to the onboard computer
        Is this your intention?
If yes, I am not sure this architectural detail is always true.
I guess Ignacio and Marco Rovatti (cc'ed here) can better comment on this 
from the ESA point of view.

Given the two remarks above, is it relevant to show Onboard Computer B?
Does the side B have duplicated features for forward/return link?
The 3 boxes just mentioned are never touched by the lines for your data 
paths. The could be there but they could also not be there in case your 
Security Function B is only a different security funcrion within a single 
spacecraft (e.g. there could be a payload using Security A and another 
payload using Security B.
Removing non touched boxes could make the diagram simpler just adding a 
remark about what Security Function B could be in various architectures.

I hope I am not missing something..

Regards

Gian Paolo



From:   "Kazz, Greg J\(US 312B\) via SLS-SEA-DLS" 
<sls-sea-dls at mailman.ccsds.org>
To:     "Biggerstaff, Craig (JSC-CD42)[SGT, INC]" 
<craig.biggerstaff at nasa.gov>, "sls-sea-dls at mailman.ccsds.org" 
<sls-sea-dls at mailman.ccsds.org>
Date:   29-05-21 22:59
Subject:        Re: [Sls-sea-dls] [EXTERNAL]  SDLS EP GB figures 4-1, 4-2
Sent by:        "SLS-SEA-DLS" <sls-sea-dls-bounces at mailman.ccsds.org>



Hi Craig,
 
My only comment is by including  “Physical Elements” such as the “Onboard 
Computer X, Command and Data Handling ” as well as busses, the diagrams to 
me come across very implementation like, i.e., like a C&DH unit. The other 
elements in the diagram are functional except for the generic buses. I 
suspect some implementation could do this all in a Software reprogrammable 
radio instead of having a C&DH. It clearly implies a certain architecture. 
Maybe there is no way to avoid this. Not sure.
 
Regards,
Greg 
 
From: SLS-SEA-DLS <sls-sea-dls-bounces at mailman.ccsds.org> on behalf of 
"Biggerstaff, Craig (JSC-CD42)[SGT, INC] via SLS-SEA-DLS" 
<sls-sea-dls at mailman.ccsds.org>
Reply-To: "Biggerstaff, Craig (JSC-CD42)[SGT, INC]" 
<craig.biggerstaff at nasa.gov>
Date: Friday, May 28, 2021 at 7:12 AM
To: "sls-sea-dls at mailman.ccsds.org" <sls-sea-dls at mailman.ccsds.org>
Subject: [EXTERNAL] [Sls-sea-dls] SDLS EP GB figures 4-1, 4-2
 
Dear SDLS WG,
 
Attached are proposed updates to Figures 4-1 and 4-2, modified to 
illustrate more clearly the data paths and the differences between using 
MAP/VC versus e.g. APID to address separate security units.  Please 
provide any suggested improvements.
 
Thanks and best regards,
 
 
 
Craig Biggerstaff
 

KBR  |  Senior Engineer Specialist, Mission Systems Operations Contract
2101 NASA Parkway, Mail Code CD4  |  Houston, Texas 77058  |  USA
Office: +1 281.483.2027  |  craig.biggerstaff at nasa.gov
 

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