OK, sorry for bothering you jimbo as I found a good, concise answer on SolidSignal. As follows...
"What Qualifies as a SWM System?
A SWM (Single Wire Multiswitch) System consists of either a
satellite dish with SWM Technology built in, or a
multiswitch with SWM Technology.
SWM Dishes are identified by having a single output, and are the only dish to require a power supply. Examples of SWM Dish are the
SL3-SWM and
SL5-SWM
A SWM Switch takes all four outputs from a satellite dish, and produces a single output, which can be divided up with splitters. The benefit of this system is only having to run one line to a DVR, which normally requires two lines. It also allows for a distribution with
splitters, similar to how cable TV is setup.
Another benefit of SWM comes with the addition of a
DECA Adapter, that feeds internet into one of the outputs from a SWM Systems. This enables every receiver to have a network connection through a single coax.
With the combination of a SWM technology and DECA, you get a DIRECTV Connected Home which features MRV or Multi-Room Viewing. This enables a house with a HD-DVR to be controlled by other HD Receivers in the building. "
I know my system has the DECA boxes for adding internet and I am pretty sure the line going to our stand alone HR22 is a single wire even though we can record and watch something else at the same time. So the HR22 and you're saying, I think, that the HR20's are also SWM compatible, right???
thanks...