How do I connect my modem to a router?
Use an Ethernet cable supplied with the modem and connect one end to the Ethernet (Internet) port on the back panel and the other end to the LAN port of your wireless router or another Ethernet-enabled device. Ensure both devices are powered properly for connection establishment. (Page 2)
From the official Spectrum Business D3 1 Advanced Voice Modem manual, page 2
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