I can verify that the Apple TB3 to TB2 adapter works with the Apple Thunderbolt Display – I'm typing in a browser window on that display right now with my new 15". As for the ports on the back of the TB display, I've successfully tested the USB and FW ports though my original Drobo connected via FW isn't recognized unless I plug it into the back of a NewerTech/OWC dual drive box that is connected to the display's FW port.
Anson42,
you post confuses me, documentation and a video suggest that this can not work.
Which Apple Cinema Display do you have, the LED or an old one?
And which features from the Apple Cinema Display work, the display, the network, the USB ports and the camera - or just the display?
The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter
http://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter
does not work with the Apple Cinema Display.
See
https://support.apple.com/en-us/HT204154
and
https://support.apple.com/en-us/HT207266
and
https://twitter.com/braddwyer/status/799278477103026176