[Sls-slp] Encapsulation packets over TC VC Packet service?

John Pietras john.pietras at gst.com
Fri Oct 23 15:27:29 UTC 2020

SLS-SLP colleagues ---
Section of the Encapsulation Packet Protocol Blue Book (CCSDS 133.1-B-3) specifies the content of the SDLP_Channel for the various underlying space data link protocols (SDLPs):

"a)       for the Virtual Channel Packet (VCP) service of TM (reference [1]), TC (reference [2]),
or AOS (reference [3]), SDLP_Channel shall contain the Global Virtual Channel
Identifier (GVCID);
b)         for the MAP Packet (MAPP) service of TC (reference [2]) and USLP (reference [5]),
SDLP_Channel shall contain the Global MAP ID (GMAP ID);
c)         for the Packet Service of Proximity-1 (reference [4]), SDLP_Channel shall contain the
Transfer Frame Version Number, the Spacecraft Identifier (SCID), the Physical
Channel Identifier (PCID), the Data Field Construction ID (DFC_ID), and the Port ID."

Missing from this list is any mention of the Virtual Channel Packet service of TC (section 3.4 of CCSDS 232.0-B-3. Was this exclusion accidental or intentional - i.e., is Encapsulation over the TC VC Packet service disallowed? I suggest that the issue be resolved unambiguously one way or the other - that is, either add it to the list of SDLP_Channels that contain GVCIDs or add a note that explicitly rules out in that usage.


Best regards,

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