[Sls-rfm] CCSDS 401 structure naming convention - proposed changes

[Enrico.Vassallo at esa.int]

Dear RFM WG colleagues,

discussing high rate 22 GHz uplink recommendations, we noted that the 
current structure naming convention may not be appropriate to cover 
"generic" data transfer applications:

        2.1     Earth-to-Space Radio Frequency          2.4     Telemetry
        2.2     Telecommand                                     2.5 Radio 
Metric
        2.3     Space-to-Earth Radio Frequency          2.6     Spacecraft

One possible solution would be to change the title of section 2.2 to 
something like "Telecommand and forward data" and that of section 2.4 to 
something like "Telemetry and return data".

This is to distinguish between telecommand and uplink data transfers (like 
on-board software patch uploading, etc.) and between (HK) telemetry and 
payload transmissions. 
Note that already now recs 2.4.8 and 2.4.23 do not mention telemetry in 
the title and deal with payload data. However, both recommendations have 
pictures for symbol rate definition with captions indicating telemetry 
symbol rate. I assume we will have the same in section 2.2.
One would need to check in detail all recommendations in 2.2 and 2.4, 
which is a lot of work I think.

Another possibility is to change the section titles to "Telecommand 
(including data transfer)" and "Telemetry (including data transfer)" so 
that we can avoid checking current recommendations for consistency.

In addition, one could use as alternative to "data transfer" the "payload" 
word although this is not generally utilized to indicate the same thing in 
different fora.

The third possibility is to ignore this semantic problem and leave 
everything unchanged.

Could I have your view  by April 15 COB?



Regards, Enrico



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