I have 3 DP34 switches cascaded, to yield 12 outputs to feed receivers. My VIP922 recently died and I replaced with with the XiP813. My VIP922 was taking in two of the 12 aformentioned feeds. When I connect the Xip813 to where the VIP922 was at, I cannot get the "check switch" to test out properly. The X813 has only one connection on the rear (was there supposed to be some other pigtail included in the box?). I have tried both of the old VIP922 connections and I get the same results on the XiP813. Thoughts? Cannot recall specifically what model of dish I have on the roof.