
I bought two modems and neither worked. and in a laptop running Ubuntu 16.04. I followed the instructions: downloaded and installed the PL2303 driver. Windows Device Manager looked fine, I could see "Prolific USB-to-Serial Comm Port (COM3)". However, I could not send AT commands to the router with PUTTY, the terminal window hung, with Ubuntu the dmesg command

TP-Link Archer CR700 - 16x4 AC1750 Wi-Fi Cable Modem Router 📶 with 680Mbps DOCSIS 3.0 - Certified for Comcast XFINITY, Spectrum, Cox, and More
9 Review

📠 Zoom 3090-00-00 V.92 / V.44 USB External Controllerless Fax Modem: High-Speed Connectivity and Easy Installation
9 Review

🚀 Zoom DOCSIS 3.0 Cable Modem 5341-02-03H: Fast and Reliable Internet Access
9 Review

RCA DCM425 Digital Cable Modem
9 Review

🔌 uni USB C Hub with Ethernet Adapter, 4K HDMI, Gigabit Ethernet, and 3 USB 3.0 Ports for MacBook Pro, iPad Pro, XPS
11 Review

🔌 Juiced Systems Silver BizHUB USB-C Multiport Gigabit HDMI Hub with 3 USB 3.0 Ports, Gigabit Ethernet, 4K HDMI, SD/Micro SD, and USB-C Power Delivery
11 Review

UGREEN USB 3.0 Ethernet Adapter Hub with RJ45: Fast Gigabit Ethernet Converter, 3 Ports USB 3.0 Hub Compatible for MacBook, iMac, Surface Pro, Chromebook, Laptop, PC
11 Review

🔌 CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review