I'm not sure how to calculate this value when etu =
  1/9600 s (default value when there is no PTS):

My interpretation of 7816-3 is that it should be a)

  wwt = 960 * WI * F / 3571200

But I could be wrong.  In particular, Cyberflex almost always requires a
longer wwt, and I usually set my own atr to increase it to about 5 seconds.
So maybe it should be b) ?

I will go re-read 7816-3 and see if I can make better sense of it.
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