Currently we have a mix of HR22 & HR24 that are all networked via CAT5. (We also have another DTV, non -HD box) in a spare guest room with no CAT5 to that room) Install is tomorrow and we do not have SWIM. Will the new setup work over our existing CAT5 or will they add a SWIM to our setup? If they add a SWIM to our system, will that non-HD box become part of the network? (the TV it is driving isn't even HD) Maybe we could move one of the HR22's to that room?