I don't know where you are or what hospital you're going to and never have seen a system with a white box. However i've worked on the tv systems in pretty much every hospital in WA at some point and can tell you what usually happens over here.
All of the systems have a number of foxtel decoders at the hospitals tv headend (one for each channel that is viewable in the hospital) audio and video from each box is then fed into a modulator which places it on a tv channel in the system. These channels are then viewable throughout the hospital by any tv.
Now the tricky bit is where some hospitals like to charge for using the tv and there are various ways they go about it. but the short version is that the white box on the back of the tv is probably blocking out certain channels until someone enables them. At which point the tv can receive these channels.
Anyway you will find that there is not actually a sat signal on the cable that goes to the tv. All the channels will be analogue which will include loclly available free to air channels, the available re-modulated foxtel channels and possibly some radio channels etc.
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