Zyxel OEM Internet Gateway branded as Centurylink C3510XZ modem.
Provides internet access to Centurylink ethernet or fiber internet customers and others.
* Four gigabit LAN ports, one gigabit WAN port* Maximum download rate 1 Gbps* WIFI 6 802.11 AX WIFI* USB 3.0 port
* Supported by Centurylink for internet access
Testing:
This device was tested by booting it up with the included AC adapter and using the ethernet cable to connect to it and login as the admin user. Unfortunately, I no longer have Centurylink fiber internet so I can't test this with actual Centurylink service. I have tested it in the past with a WAN connection and it works perfectly.
This device was originally offered by Centurylink for their fiber internet service and is now supported and documented on the Quantum Fiber from AT&T web pages as a supported device.