Direct answer
Backhaul is the connection carrying traffic from a mesh node or access point to the main router and network. Wireless backhaul uses radio spectrum; Ethernet backhaul uses cable. Wired backhaul can improve consistency and preserve more wireless capacity for phones, tablets, cameras, and smart devices, especially when nodes are separated by walls or long distances.
The benefit depends on product and topology. Some platforms support Ethernet directly; others restrict ports, switching arrangements, bridge modes, or mixed wired/wireless nodes. Cabling alone will not correct poor access-point placement, defective terminations, channel congestion, or undersized switching. Verify the supported topology, certify each cable, and confirm in management software that every node uses the intended path after installation. See Google's hardwiring documentation for one example.
Sources and technical references
Use the organizations responsible for a product, platform or standard to confirm current specifications and compatibility.
How this answer was prepared
Camelback Smart Homes publishes this FAQ library for homeowners, design professionals, builders and property teams comparing integrated technology. Answers begin with the practical conclusion, then explain the factors that can change it.
Limitations: This is general educational information, not a site-specific design, quote, code determination or compatibility guarantee. Final requirements depend on the property, construction, infrastructure, equipment versions and project goals.