This guy explains itt much better in regards to Dji Occusync and how it works between the range of drones Dji made.

Hello there Suren. Good day and thank you for posting this video here at DJI Forum. Again, thank you for your support and have a nice day.

Thank you Suren for this link. But maybe a better communication would be your brief summary of the video. Just saying, we trust you more  ;-)

GaryDoug Posted at 12-2 22:18
Thank you Suren for this link. But maybe a better communication would be your brief summary of the video. Just saying, we trust you more  ;-)

Don't trust me, I just lift off and fly. This guys explains it well and this should help the who wants to know why the old SC does not work with the Mavic 3.

Interesting video (a bit long for me, especially since he did not bother to add an index)

Thanks for sharing. .  

Good breakdown.  A little technical, but good.

Nice find Suren.  I really wish he would have indexed the video.  I could have skipped all the complex technical info and gone straight to hearing in layman's terms why the M3 can't run on old guard SC.  I believe that started at 23:00.  

Thanks for sharing.  

Thank you good video.
I like to learn more and more about Ocusync.

I'm pretty sure that the P1 and the S1 are the core of the SDR coding/encoding Ocusync protocol.
The S1 chip decodes only the part of the Ocusync relating to the communication of the commands, extrapolates the ocusync packets and sends the video part to the smartphone that will manage the video stream.
For this it is also a bit slower and dependent on the decoding speed of the smartphone.

Instead, the P1 decodes all of the Ocusync, including the video. In fact we find it in the DJI FPV where there is no smartphone.
It is likely that they have also decided to insert it in the new SmartController to speed up the decoding operations.

It is a rather common situation for example in DVB-S2 digital communications: adding the header, scrambling, encoding, FEC, interleaving, etc., are performed by an FPGA, the rest by a CPU but an FPGA can also do everything, it depends on the speed you want to achieve in decoding.
But a CPU can do it all too. It is full of examples in GnuRadio.

DowntownRDB Posted at 12-3 15:10
Nice find Suren.  I really wish he would have indexed the video.  I could have skipped all the complex technical info and gone straight to hearing in layman's terms why the M3 can't run on old guard SC.  I believe that started at 23:00.  

Thanks for sharing.

hahaha yeah I guess he just got into it. Well at least now we know about O3

Suren Posted at 12-5 10:19
hahaha yeah I guess he just got into it. Well at least now we know about O3

I have to give him credit as he really did come through about O3.