[Sls-slp] Encapsulation packets over TC VC Packet service?
john.pietras at gst.com
Fri Oct 23 16:55:25 UTC 2020
Dear Gian Paolo.
It’s obvious that I’m due for my annual vision test ☺! I read that line several times and somehow overlooked the “TC (reference )”. I am truly embarrassed.
Thank you for your quick response. And to the rest of you, my apologies for wasting your time with my error.
From: Gian.Paolo.Calzolari at esa.int [mailto:Gian.Paolo.Calzolari at esa.int]
Sent: Friday, October 23, 2020 12:41 PM
To: John Pietras <john.pietras at gst.com>
Cc: sls-slp at mailman.ccsds.org
Subject: Re: [Sls-slp] Encapsulation packets over TC VC Packet service?
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 below.
That bullet intends to refer to VCP Service that - mutatis mutandis - is actually provided by 3 books:
TM (reference ),
TC (reference ),
AOS (reference ),
Am I overlooking something?
From: "John Pietras" <john.pietras at gst.com<mailto:john.pietras at gst.com>>
To: "sls-slp at mailman.ccsds.org<mailto:sls-slp at mailman.ccsds.org>" <sls-slp at mailman.ccsds.org<mailto: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<mailto:sls-slp-bounces at mailman.ccsds.org>>
SLS-SLP colleagues ---
Section 220.127.116.11 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 ), TC (reference ),
or AOS (reference ), SDLP_Channel shall contain the Global Virtual Channel
b) for the MAP Packet (MAPP) service of TC (reference ) and USLP (reference ),
SDLP_Channel shall contain the Global MAP ID (GMAP ID);
c) for the Packet Service of Proximity-1 (reference ), 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.
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