You do not need this switch to connect your Orbi to your modem, just connect the Orbi directly to the modem. If however, you need more hardwired ethernet connections aside from the one(s) provided to you by the Orbi, then yes, you'll need this switch. If you have a Spectrum modem/router combo, I suggest you return it and ask for only a modem and save yourself the Wi-Fi charge from them. Your connection should be as follows: modem, Netgear Orbi, switch, then all ethernet capable connected devices such as PS4, Apple TV, TV, etc.