The SWM8 is for the Slimline-5 dish (although I guess it could work for any dish). The SWM side is compatible with the HR2X, H2x, R16, R22 and D12 (IIRC). The SWM8 has 3 legacy ports (to allow it to be used with non-SWM compatible receivers, like the R15), however, just like with a multiswitch, you would have to run 2 lines to your R15.