Guys,
Just a heads up about using 8.1.5.1 on Backhauls.
We had switched all our BHs to 8.1.5.1
We noticed that our managed switch was repoting FCS errors on the link with the backhaul.
We changed the port on the switch, same problem, changed cable, same problem, changed backhaul, same problem.
Problem was resolved when we downgraded back to 7.14
The moral of the story is quite clear 