I am now using 3rd set of mesh solution,
the last 2 AC mesh router pair from Google onehub and Asus Lyra trio were with wired backhaul. they were serving me well ,Google onehub with best software usage experience with auto fw update. Asus Lyra is great too but firmware update for the satellite unit is painful, the app did not help to update all units.
as the wired backhaul is giving guaranteed higher bandwidth than the AC dual band could provide, as such, I stick to wired backhaul.
now on a TP-Link xe75 pro pair,AXE triband.
this is a first time, I find the wireless backhaul is providing higher bandwidth (no chance to test it due to broadband max limit at 1G)than the wired backhaul (1G).
I am still observing should I stick to wireless backhaul (6GHz) versus revert to wired backhaul(stability)
I have habit to shutdown all routers at 2 am, the next day 2 main mesh router and satellite racing to power up is timer control to stagger starting the main router first.
other information
my house is fully wired and with a square layout, the old school every room with AP+switch is serving all purposes of usage, definitely not losing out to mesh solution.
just curiosity to explore different setup.
I find those AX routers with unicorn antennas too intimidating to place in living hall therefore getting the mesh router which usually with simpler design.
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