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

Gian.Paolo.Calzolari at esa.int Gian.Paolo.Calzolari at esa.int
Fri Oct 23 16:40:30 UTC 2020

Dear John,
        I think that Virtual Channel Packet service of TC (section 3.4 of 
CCSDS 232.0-B-3) is actually mentioned under the bullet "a" you report 
That bullet intends to refer to VCP Service that - mutatis mutandis - is 
actually provided by 3 books:
TM (reference [1]), 
TC (reference [2]),
AOS (reference [3]), 

Am I overlooking something?


Gian Paolo

From:   "John Pietras" <john.pietras at gst.com>
To:     "sls-slp at mailman.ccsds.org" <sls-slp at mailman.ccsds.org>
Date:   23-10-20 17:27
Subject:        [Sls-slp] Encapsulation packets over TC VC Packet service?
Sent by:        "SLS-SLP" <sls-slp-bounces at mailman.ccsds.org>

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 
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 
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,
SLS-SLP mailing list
SLS-SLP at mailman.ccsds.org

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