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The Arris T-25 is a modem that supports internet access and telephone. It is not wireless (not WiFi) internet access. If you are referring to a television cable box then that cable box stands on its own to provide television service. Incoming service from Xfinity is split with one of the splits going to the cable box for television service and the other split going to the modem that provides the internet and phone service. Each is actually independent of the other.
Sorry, there was a problem. Please try again later.Yes; Run coax cable from cable box to input on modem.
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