I know this thread is over one year old, but does anyone know about the current status of this?
On their current Teranex 2D product page [1], the feature is advertised as already included (which I would read as "existing"):
Thunderbolt port for computer capture and playback, RS-422 deck control, reference input, and ethernet are included for remote configuration.
In the most recent Teranex manual (June 2013) [2], there seems to be no information about how to configure anything ethernet-based, though

[1] blackmagicdesign.com/products/teranex/models
[2] blackmagicdesign.com/media/5721138/Teranex_Manual_201306.pdf