When DJI released the Mavic Pro they decided to change the transmission system that communicates between the remote control and the drone.
The new system is called OcuSync and it has some impressive capabilities worth looking at.
Of course, it also has some differences and downsides to the other transmission technology in the DJI Lightbridge family.
OcuSync 2.0 Specs (2018)
Occusync 2.0 was released with the Mavic 2.0 model in August 2018. There have been some nice improvements in the technology which I will summarise below:
Ocusync 2.0 has an upgraded resolution of 1080p for all distances.
Maximum Transmission Distance
10 km (FCC), 6 km (CE), 6 km (SRRC), 6 km (MIC)
Video Download Speed
Video downloads at 40Mb/s just like the Ocusync 1.0.
Live View Video Quality
Resolution/Framerate: 720p@30fps, 1080@p30fps
The Mavic 2.0 with Ocusync 2.0 can use either 2.4 GHz and 5.8 GHz which gives it more flexibility when there is a lot of interference in transmission.
It auto-switches between these two frequencies. So, the system is even more robust.
Latency is also 120-130ms, which is not really an improvement, but we can't have it all, right?
OcuSync 1.0 Specs
Let's go a little deeper and have a look at what the specs are of the Ocusync 1.0 system, which was used on all versions of the Mavic previous to the Mavic 2.0 (Mavic Pro, Mavic Pro Platinum).
Ocusync can transmit video at 720p or 1080p (at short distances).
It depends on the situation, but in general OcuSync will use 1080p for close range transmission and 720p for long-range transmission. Which makes sense, as it is harder to transmit so much data at longer distances.
Video Download Speed
When things are running well, at a shorter distance and low interference, you can get photo and video downloads at 40Mb/s.
THE DJI Mavic Pro using OcuSync starts by scanning for any local interference and then makes a decision between three transmission channels: 20MHz mode, the 10MHz mode, and the lowest priority 1.4MHz mode.
During flight it will then automatically switch between channels (within the chosen mode) if it notices any interference.
So, the system is very robust.
A big issue with any transmission system is the latency. Which is the amount of delay you experience.
The DJI team have done a great job with the new OcuSync and achieved these values:
- 5ms for remote controller transmission commands
- 10ms for video data
- 130ms for videos
Note: 160ms-170ms from the Mavic’s camera to your device screen under ideal conditions.
OcuSync has a great transmission distance and I have seen a lot of videos on Youtube where people have flown these distances.
OcuSync has a range of up to 4.3 miles (7 km).