The seperator allows Single wire use.
It allows you to use 1 wire to run both your receivers tuners.
This is so you can record live tv , while watching,or recording another channel at the same time.
Again the VIP 612 Does NOT do Picture In Picture.
Only the VIP DVRs 622,722,722k and thats only in Single Mode.
Vip 222 also does PIP But it is not a DVR.
I wish Dish would add a mode button on to their remotes. some many customers call me because they forgot how to set the pip on the receiver and how to turn it back into dual mode. I also still think a clock on the face of the receiver would be nice.