It's b/c the upstairs bedroom does not have a cable outlet, so I'm using a wireless cable system to send the cable signal from downstairs to upstairs and it comes with an IR mouse to extend the remote control's range. That way you can use the remote control upstairs to control the STB downstairs. The upstairs remote doesn't affect the downstairs HD PVR, but the HD PVR's remote controls both boxes even when I'm pointing away from the cable box. I tried covering the IR receiver with stuff, and somehow the PVR's remote can still reach it...lol Even when I'm pointing to the floor away from the SD STB, the box still picks up the signal from the remote, which is odd, because the HD PVR won't work unless I'm pointing directly at it.
I can't block the signal by covering it with tape or cardboard because I still need to be able to send a signal from upstairs to the box so they can change the channel and control volume upstairs without having to run downstairs to the box to change it.
And the point of having two STBs is so that people can watch TV in both locations simultaneously.
I guess my only option now is to get a separate remote to control one of the STBs.
I could also try sending the cable signal wirelessly from the basement to the 2nd floor, but I'm pretty sure that will degrade the quality of the picture by quite a bit.