In a mesh system, the backhaul is the link each node uses to pass your data back to the main router. Your phone might have a great connection to the nearest node, but that node can only forward what its own backhaul carries. That’s why the room furthest from the router is so often the slow one.

You have four options, and in Router Academy’s order of preference they are:

  1. Ethernet, a cable between nodes.
  2. Coax (MoCA), if your home already has TV coax in the right rooms.
  3. Dedicated wireless, a radio band used only for node-to-node traffic.
  4. Shared wireless, the same radio serving both the backhaul and your devices.

If you can wire even one node, do it.

Mesh backhaul Mesh nodes pass traffic back to the main router over a backhaul link. A wired hop (solid) does not use Wi-Fi airtime; a wireless hop (dotted) shares or dedicates radio capacity, and its quality depends on node placement. Main router Node A wired backhaul Node B wireless backhaul Phone Laptop
  • Wired (Ethernet)
  • Wi-Fi
  • Wireless backhaul
Mesh nodes pass traffic back to the main router over a backhaul link. A wired hop (solid) does not use Wi-Fi airtime; a wireless hop (dotted) shares or dedicates radio capacity, and its quality depends on node placement.

Wireless backhaul: shared or dedicated

Without cables, mesh nodes link to each other over Wi-Fi. How they do it matters:

  • Shared: a single radio band carries both the node-to-router link and your devices’ traffic, so that connection has to split its time between the two jobs.
  • Dedicated: tri-band designs add an extra band used only for the link back to the router, which reduces that penalty.

Getting wireless backhaul right

Placement matters more for wireless backhaul than for anything else in a mesh system. TP-Link’s guidance for its Deco systems is a useful benchmark: aim for at least two bars of signal between units, put the satellite at the same height as the unit it connects to (about 1 to 1.5 feet off the floor), and keep units away from microwaves, Bluetooth devices and USB 3.0 devices, which can interfere on 2.4 GHz.

In practice, that means a satellite belongs roughly where the main unit’s signal is still good, not in the dead zone itself.

Ethernet backhaul

With Ethernet backhaul, two units talk over a cable instead of over Wi-Fi. The backhaul then uses none of the wireless bandwidth your devices share. TP-Link also notes that a wired connection is more stable and faster than wireless backhaul.

You don’t have to wire everything:

  • Mix and match. Only units that are cabled together use Ethernet backhaul; the rest keep using wireless, and the two can be mixed in one network.
  • Watch the switch. If the cable runs through a network switch, check compatibility. TP-Link warns that some switches don’t forward mesh traffic correctly and publishes a list of verified models.
  • Match the port speed. If your plan or your nodes are faster than 1 Gbps, multi-gig ports (2.5 or 5 Gbps Ethernet, standardized in IEEE 802.3bz) let the cable keep up.

Coax backhaul (MoCA)

If running Ethernet isn’t practical but your home has coaxial TV cabling, MoCA adapters can carry the backhaul over that coax instead. The MoCA Alliance specifies its current MoCA 2.5 standard at 2.5 Gbps of actual throughput with under 2.5 ms latency. Those are the alliance’s own specification figures, so treat them as a ceiling, not a guarantee in your home.

The options side by side

Shared wireless Dedicated wireless Ethernet Coax (MoCA)
Cables None None Ethernet to each wired node Existing TV coax plus adapters
Uses Wi-Fi capacity Yes, shared with devices A separate band No No
Sensitive to placement Very Yes No No
Effort Lowest Low Highest, unless already wired Moderate

To decide whether mesh is right for you at all, see Mesh Wi-Fi vs router vs extender. To plan where the nodes go, see How many mesh nodes do you need?