The talkback feature on the camera converter is a little strange - I can't see how one would use it in a multicamera system without adding additional equipment.
There are 2 different scenarios depending on if you have an existing talkback system or not.
If you have no talkback currently then you will need an audio distro amp and a basic audio mixer, these both sit with the director, a microphone is plugged into the input of the audio distro amp and the outputs of the audio distro amp are plugged into the mic input of each of the local atem camera converters. The headphones out of each of these local converters is plugged into the audio mixer and the output of this is fed to the directors headphones. At the camera end you just plug the mic and headphones into the atem converter and then your set.
If you have a standard 3 wire PL talkback system then you could set things up as above with a ADA and a mixer, then you would plug the mixer output into a audio input on the comms base station and feed the ADA with the audio output from your comms base station. If your comms base station is too basic to have audio in and out, then you could simply make an adaptor wire to take the audio send and return feeds out of a normal beltpack (this is a simple xlr 4 or 5 pin, whichever your headsets use, to whatever connectors you need on the mixer and ADA)
I you have a lot of beltpacks then you can drop the need for the ADA and mixer by simply using a beltpack with a 4/5pin to 2x minijack connected to each of the local ends of the atem converters.
All of which makes for a bit of a messy system - really your better off using cameras with proper studio cables (26pin / triax / smtp fibre) as not only will you have talkback that is easier to setup and neater, you'll also have proper remote control of iris and black level, universally compatible tally, genlock and returns into the camera viewfinder.
I can't see the ATEM camera converter being a very popular product, at $1000 per camera (2x converters one at each end of the fibre) it's pretty expensive for a product that doesn't have any remote control facilites, and is clearly designed to work with low end cameras. I'm also concerned about the flimsy fibre connector - i could see that breaking very easily.
On the other hand it's quite a cheap* solution for a bidirectional HDSDI / DVI / HDMI sender so it could prove popular for simply sending these hd signals a long distance, it's just the camera specific add ons which seem a little ill thought out.
*go to
http://www.telecast-fiber.com/ to see how expensive fibre used to be!
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