[Sea-sa] [EXTERNAL] protocol view

Shames, Peter M (US 312B) peter.m.shames at jpl.nasa.gov
Sat Nov 11 16:27:20 UTC 2023

Dear Xiongwen, et al,

Thanks for sharing this view of the SOIS protocol stacks, and the related CCSDS protocols that you mentioned during the SEA-SA working meeting.  I think it is a useful diagram for SOIS since it shows the relationships among the various SOIS layers and the rest of the CCSDS (and IETF) layers.  It may be of use for SOIS documents.  I personally appreciate that you included the MTS, TAS, DES, etc even though they are silverized.  I always felt that was a loss to the SOIS arsenal of capabilities, even if it was underappreciated by many.

It appears that we do have some differences of opinion in how these various layers fit together and which ISO protocol layers they belong to.  I have moved these elements around and associated them with the ISO layers that I understand they belong to, and changed, in some cases, the ordering to align with common CCSDS practice.  You may, of course, have a different opinion, and assigned layers are sometimes a source of confusion.

This is particularly the case when the DTN protocols, BPv7 and BP Sec are shown being “tunneled” over TCP or UDP IP.  As I believe I commented during the meeting, in this case the TCP/IP protocols are being treated as a “logical data link” by the DTN protocols for use on Earth, where RTLT is short.  For long haul deployments we always assume that DTN forms the end-to-end network/transport layer, and not TCP/IP.  It will not typically be the case that DTN over IP tunnels are used in space, but it may be the case that various IP application protocols, used with suitable protocol translating gateways, are tunneled over DTN in space.

Best regards, Peter

From: he xiongwen <hexw501 at hotmail.com>
Date: Thursday, November 9, 2023 at 3:10 AM
To: Peter Shames <peter.m.shames at jpl.nasa.gov>
Subject: [EXTERNAL] protocol view

Dear Peter,
           Attached is a proposed layered protocol view for both space internetworking and onboard communication.

Best Regards,

Xiongwen He
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