hmm, just had an engineer round to look at my STB as the broadband and then the TV signal was playing up.
First the router kept loosing it's connection ( when I said I was rebooting the STB once a day, I was told that's normal
) so faults told me to take off the router and see if that solved it. Yes it did, the connection stopped dropping at odd times and the download speed leapt up from only a max 100kb/s to a more reasonable 400kb/s or more (I've got a failry heavy P2P load going at the mo). UNfortunately the Pace 1000 STB couldn't cope with that and the TV piccy kept freezing, the EPG kept jamming and so on. Engineer has tweaked the signal strength which is shared by broadbadn and Digi TV and seems OK for now. However he was not confident that the STB was goinng to handle the faster speed when it comes.
Apparently though in 9 days time, according to the engineer (may just be my area though) the Samsung boxes will become available (not ready yet). Any new boxes issued, even for repairs after that time, will be Samsung and the older Pace boxes withdrawn. Engineer also suggested the Samsung boxes could cope with broadband speeds of 2Mb/s wheras the current Pace boxes as we know can't handle 1Mb/s, and often less than that.
Ultimately although it's one cable to your house, theres probably a range of signal frequencies being used to separate digi TV and broadband. It seems to be the STB that's the limiting factor in being able to decode and handles more than one signal at a time.