Hi @Chrispy42 ,

Welcome to our community.

If you want to use the SFP+ port on your router as the WAN port and replace the ISP provided ONT/ONU, it is generally necessary to use an SFP+ ONU Stick in conjunction with it.
However, SFP+ ONU Sticks are not widely applicable to all ISPs, the choice of SFP+ ONU Stick largely depends on whether it has been verified and approved by your ISP (Internet Service Provider). It is highly recommended to reach out to your ISP to acquire an officially verified, compatible SFP+ ONU Stick, as we can't guarantee compatibility, availability, or stability.

SFP+ ports are typically found on high-end networking equipment such as Archer AXE300 and WiFi 7 Routers Archer BE800 etc., which can be used for LAN or WAN connection in the four common application scenarios:
    1. High-Speed WAN Connectivity: Leveraging SFP+ Ports for Direct Fiber Optic Connection and High-Speed Internet Access.
    2. Ethernet Conversion: Utilizing SFP+ Electrical Port Modules for WAN Connectivity with Ethernet Modems.
    3. High-Speed LAN Communication: Enhancing Local Area Networks with SFP+ Optical and Electrical Port Modules for Fast LAN Communication.
    4. Ethernet Backhaul EasyMesh Network: Creating a High-Speed Ethernet Backhaul Network by Connecting Multiple EasyMesh Routers through SFP+ Ports.
For more detailed information, please refer to this thread: Common Application Scenarios of SFP+ Interface