Since the modem is a cable modem it has ports imbued within that enables the Ethernet cords to connect with the corresponding network components. The ARRIS Surfboard SBG7580-AC modem has 4 Gigabit Ethernet ports imbued within that enables connection with coaxial cables and USB ports separately. Therefore, one does not need to buy the ethernet cord additionally as it is available within the modem due to packaging.