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It doesn't necessarily have to go to the same cable as the modem, any coaxial outlet would do, although it's pretty uncommon to have a bunch next to each other so we'll say yes for the sake of it. As for the second question no products like this are intended to make non moca ready devices function as though they were, by sending the MoCA signal through the cable line to the second adapter which then turns it back into ethernet for the device. I'll draw up a quick diagram of a couple ways to use hope it helps. The second way is preferable since it eliminates 2 possible issues 1) reducing your signal to a point where your modem no longer connects properly 2) noise that could be introduced by otherwise unused lines that could also cause your modem not to connect OR lower your speeds (this will only happen if those cables are bad, lowering signal does not itself lower internet speeds). The first is probably more practical however since most houses don't have multiple coax ports in close proximity. If your provider has already placed splitters in your line somewhere to deal with signal that is too high this can help with issue 1 as long as you balance it out to be roughly the same loss to the modem as it was before. If you have further questions about your specific use it may be wise to contact your ISP to have a local tech help.
Sorry, there was a problem. Please try again later.Check the model of your modem, if it has MoCA already built in then you only need 1 adapter and it can connect anywhere in the chain. If you don't already have MoCA built into your modem then yes you install 1 adapter at the coax point of entry into your home then into the modem and router.
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