What is that Boeing 757 custom cockpit interface? Cropped; flickr.com, 2008

The photo is taken in cruise. The selected display shows takeoff data. There is also a send button (which hints at a datalink capability for communicating values).

I searched for performance calculators and datalink solutions for the 757, but came up empty. Nothing matched that unit.

What are its features? Say compared to Boeing's own ACARS/AOC for datalink (via the standard CDUs).
It's an American Airlines ACARS unit.