I would like to know if other shaw or motorola digital or HD units will work on other televisions in our home if we hook up a gateway and portal to just 2 TV's?
Yes, but they need to be separated from the Gateway's MoCA network with the filters Shaw has.
I have a Gateway with 2 Portals and the older DCX3400 running together
Kevinds is correct, they will work fine, the Shaw technician that will install the Gateway system will take care of how the wiring needs to be setup for you.
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