[CESG] Last Hop / First Hop service

Shames, Peter M (US 312B) peter.m.shames at jpl.nasa.gov
Tue May 30 08:04:32 UTC 2023

Dear Tomaso, et al,

During today’s CMC meeting the question came up of the origins of the Last Hop / First Hop service.  Regardless of which Area or WG takes this work up, I thought it worthwhile to share the document that defined this service, along with the rationale for it.

This was studied in 2010 as part of the IOAG Space Internetworking Strategy group (SISG).  It was intended as a service to “determine how the SSI will handle services for spacecraft that do not or cannot implement SSI user node functions”.  This explicitly includes SSI nodes that need to be “rebooted” using link layer / emergency commands, as well as nodes that are not DTN nodes, but that could benefit from using a higher speed DTN relay service than their own DTE/DFE link can support.

For the record, the attached document is what was published by the IOAG back in 2010.

Cheers, Peter

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