It's got two coaxial connectors for hooking up a cable box or modem, as well as a serial port for any printer or other peripheral device. It also provides two community ports so that you can link the unit to some server, a Wi-Fi router, or almost every other device https://clayton81hhg.izrablog.com/34449694/the-fact-about-ups-cleanline-that-no-one-is-suggesting