It's two coaxial connectors for hooking up a cable box or modem, in addition to a serial port for just a printer or other peripheral system. It also provides two community ports that you should connect the unit to the server, a Wi-Fi router, or every other unit that requires https://coco-agriculture62592.ssnblog.com/32997108/how-ups-can-t-turn-on-can-save-you-time-stress-and-money