I just thought I would throw in my 2 cents.
The whole system is in a network. The Fathom-X board is only there to extend the reach of the network.
This means that you can insert a router between the Fathom-X and the Pi and connect whatever you want to the network.
The only thing you need to be careful is bandwidth.
They say you should get about 70mbps.
If you split this in half for a safety margin minus about 10 for the BR2 you still have 25mbps bandwidth to play with.
We have an IP camera connected in this manner and its using 2Mbps. So we could potentially connect 12…
We found that our IP camera produced much better video. The only issue here is latency. About 0.5 second to 1 second. So, not good enough for flying but good enough for recording survey.
Alternatively, there is another USB port on the Pi which can host another camera. We haven’t looked into this yet but we would like to put a BR USB camera in a GoPro Housing for tether monitoring. I imagine that you could also put a USB hub to increase this connectivity.
There is no rules that prevent you from adding another Pi in another 4 inch enclosure and configuring it as a camera server…
Note that there are 4 pairs in the tether so potentially you could put 4 Fathom-X boards…
I think that the combination of both methods is probably the ideal way to go. Although Todd’s idea is great, I find it comes at the cost of sacrificing a valuable pair. (Note that we are planning for a different tether that would give us only 2 pairs.) In the end it all depends what you need to put on the ROV.
Here is the link to the camera and ethernet switch we used:
If you take the switch out of its box it is very small. We are also planning in removing the ethernet connectors and soldering cables directly on the board instead. This fits in the 4inch enclosure.
Soon we will be trying a UHD camera.