[evla-sw-discuss] Keeping track of spectral windows at the EVLA: SDM vs. BDF

[Michael Rupen]

Hi David --

>>  ...
>>
>>  2- As to the ordering of swIndex, let's adopt the revisions suggested
>>  by Sonja & David:
>>
>>  1- swIndex is ordered according to the lower edge of the lowest
>>  frequency channel in each SpW (lower frequencies come first)
>>
>>  2- for remaining matches, give the lower swIndex to the SpW with
>>  the narrower total bandwidth
>>
>>  3- for remaining matches, give the lower swIndex to the SpW with
>>  more (hence narrower) channels
>>
>>  4- for remaining (exact) matches, the lower VCI sbid (subband ID)
>>  gets the lower swIndex
>>
>>  ***This ordering should be based on the _output_ of the CBE, _after_
>>  any CBE processing such as smoothing-and-decimation, subselection of a
>>  group of channels, etc.*** The distinction is not relevant yet but
>>  will be in the future (months from now).
>
> Asterisks always get my attention.

Yep, that's why they were there :)

> If the CBE processes affect # of channels, and that is part of the sort done 
> by SSS, does OPT have info it needs to handle #3 in the sort order above?


Yes.  The OPT will be putting the orders in the model which create the
corresponding VCI commands which are eventually sent to the CBE and MCAF.
These commands do not yet exist but they will.  This should be easy enough,
as those commands will be very explicit (something like a check box for "save
only some channels" and a corresponding list of channels to save).


> Even if it does, can we just elim step 3 & use 1,2,4?

I would prefer to leave the very esoteric case #4 to very strange (test) 
cases, and have fully deterministic answers for all other setups.  #3 is 
needed for that.

IMHO, of course ;)

           Michael