Inside the standard TIU are two boards - the main DCS/power mother board and a radio board for communication to the remote. The radio board plugs into the mother board. Seems like I remember reading a post a long while ago from MTH R&D that for the new WTIU the radio board had to be removed. I assumed that meant they were going to replace the radio board with a WIFI board and essentially make no hardware changes to the mother board. Of course this is just me speculating.
Ken
