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Una risposta valida ma che non moglie l'ultima questione..
The EU mandated that frequency hopping systems that have more than a 10% duty cycle (ie whose transmission lasts longer than 10% of the time they are on any given channel) use Look Before Talk to control transmission on that channel. This affected FASST and FrSky's ACCST D8 & D16 protocols, among others.
They also banned protocols with too few channels in their hop pattern or a non-FHSS implementation. DSM2 was one of the affected protocols.
Radios supporting transmission with non-compliant protocols were no longer legal to import after January 2015, but if already imported remained legal to use.
Futaba altered FASST to have a LBT implementation that was fully backwards compatible with Futaba receivers (but conveniently caused issues for most of the FASST compatibles) and rolled that out via firmware updates. That's why you get some FrSky TF series receivers that just won't bind with newer Futaba FASST-capable radios, the TF series receivers are not firmware upgradable and older ones hate the newer FASST radios. Newer TF series receivers work fine.
There was a regulatory changes in 2018 IIRC that didn't change what was compliant technically, but did impose additional implementation requirements on newer designs, which is why FrSky had to come up with a method to block D8 compatibility on their new radios, because a radio which could be made D8 compatible (and thus not compliant with EU rules) via a firmware update was no longer legal to introduce after the 2018 rule change. I'm not sure how that affected Futaba, as the 32MZ should have been covered by that rule change as well.
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