The NETGEAR Nighthawk CM1150V is a high-speed DOCSIS 3.1 cable modem designed primarily for Xfinity Internet and Xfinity Voice service. It is a modem only (not a Wi-Fi router), so it is typically connected to a separate router such as your AX8.
Key features:
DOCSIS 3.1 technology for faster speeds and improved efficiency.
Supports Gigabit and Multi-Gig internet service tiers.
Four Gigabit Ethernet ports for wired connections.
Two RJ-11 telephone ports for Xfinity Voice service.
Voice traffic is prioritized for clear phone calls.
Supports features such as caller ID, call forwarding, and three-way calling.
Backward compatible with DOCSIS 3.0 systems.
For your setup, the CM1150V modem connects to the cable line, and your NETGEAR AX8 router provides the Wi-Fi network throughout your home. Together they make a very capable combination for streaming, web browsing, video calls, and multiple connected devices.