[Sls-slp] E2.2.15 LEC Report/Demand Field

[Stefano Petri]

Thanks Greg,

I am fine with the answers to the points raised in the other email thread.
There is just this point below that I am not fully convinced.

So if I restate the note below:
-when LEC report/demand is 0, we ignore the Demand/Query bit and the Query response bit.
-when LEC report/demand is 1, we set Demand/Query to 0.


So, how can we send a directive to actually change the parameters of the link with a Demand directive?
If we set the Demand/Query to 0 (meaning “Demand”), and we set the LEC report/demand to 1, we would interpret the directive as a “LEC demand” according to the note below.
If we set the  Demand/Query to 0 (meaning “Demand”), and we set the LEC report/demand to 0, the note tells us to ignore the Demand/Query bit.

This is why I would have thought that a single field with multiple bits, enumerating the different directive options (demand, query, LEC report, LEC demand), could be more “elegant”.

Thanks
Best regards

Stefano



From: Kazz, Greg (US 312B) <greg.j.kazz at jpl.nasa.gov>
Sent: 25 June 2025 17:15
To: Stefano Petri <Stefano.Petri at esa.int>
Cc: Kazz, Greg (US 312B) via SLS-SLP <sls-slp at mailman.ccsds.org>
Subject: E2.2.15 LEC Report/Demand Field

Hi Stefano again,

Please take a look at the update I made to Section 2.2.15 in the attached word document.
I believe it addresses your concern about how to set the Demand/Query flag as well as the Query Response flag, when a partnered node is simply passing the LEC directive to the other node using it as a type of status reporting between radios… or when one node demands the report from the partnered node i.e., a “demand” reporting.

If you are OK with this formulation, then I will ask the Secretariat to update the draft 235.0-W book accordingly.

thanks much,
Greg

Below is the snipet:

E2.2.15     LEC Report/Demand
Bit 23 of the LINK ESTABLISHMENT & CONTROL (LEC) directive tells how the LEC directive is used as a voluntary or demanded reporting mechanism. By setting this value to ‘0’, the values in the LEC directive are reported to the partnered radio. In this case, both E2.2.5 Demand/Query Flag and E2.2.6 Query Response Flag are ignored. Conversely, by setting this value to ‘1’, a demand for these values is made to the partnered radio. In this case, E2.2.5 Demand/Query Flag is set to ‘0’ (Demand) and E2.2.6 Query Response flag is ignored.

  1.  ‘0’ = Report LEC Values Only;

  1.  ‘1’ = Demand LEC Values.

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