Yep it is the real thing, I actually touched one of those while they were still in development. Around 94/95 apple looked at getting into this market, it is the forerunner to the Tivo, if you notice it has the old Powerbook style SCSI connector. It was a cable decoder as well as some level of Mac functionality. You remember the old MacTV product well this is it without the monitor. All these product got killed when apple was sucking wind.
Well on this subject, what you think old apple prototypes are worth, I have a number of them.