I have a DP34
2 lines are to (2) 811 HD units
2 lines are to (2) 311 units now
(1) of the 311 units is going to be replaced with the 625
I already have the 2 lines to this location with the 811 I just want the 625 to be here hooked up as a single tuner. so I can switch between the 811/625 on...