it doesnt.
all cable in the house that feeds your TV's requires a source. with satellite the source is the dish. so every box requires a line that goes to that dish.
if you have cable the source is your utility panel typically, shaw enters your home thru there.
if you have telus the source is your telus router if you use cat5/6 cable. i havent seen how a setup works yet on coaxial.
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