Modems vs. Routers: What They Do and How They're Different
Amazon.com: MOTOROLA 8x4 Cable Modem, Model MB7220, 343 Mbps DOCSIS 3.0, Certified by Comcast XFINITY, Time Warner Cable, Cox, BrightHouse, and More (No Wireless) : Electronics
Cable modem - Wikipedia
The 3 Best Cable Modems of 2022 | Reviews by Wirecutter