@guyd2 

try forcing the port to 1000Mbps on the switch

  @guyd2 

goto port configuration on the switch

  @guyd2 

 As you can see, port 3 is orange before change.

After change suggested, port 3 is disconnected (after reboot, tried with and without "force authorize").

Suggestion does not work.

  @guyd2 

if the port is disconnected after you set 1000Mbps, there is a fault with the cable or the access point. try connecting the access point directly to the switch with a short patch cable. if you get 1000Mbps then the cable is broken.

I see port 3 provides power to the access point but not data after you locked the port to 1000Mbps. if I have to guess, there is a fault on one of the pairs in the cable, therefore only 100Mbps

  @MR.S 

I missed that you have already tested with a short cable. sorry :-) how long is the cable from the switch to the access point?

  @MR.S 

for both assumptions- see initial post.

Guy

  @guyd2 

it says nothing about cable length on the cable that doesn't work, but regardless, there is a fault between the switch and the access point. there is no doubt about that. so I suggest you check again. since you get 1000Mbps on a short 2 meter patch cable, the access point is fine.

  @guyd2 

For some unexplained behaviour (since cheked several times as posted at start).

I decided to take my second, still not mounted yet, 265HD for a much further location on second story (50m of cable)as a test for affect of long cable. Surprisingly - it got a "green" light. So I was happy to know that distance is not an issue. So I crossed between 2nd AP and 1st AP... and another surprise again - both of them are "green"!!!

So after many hours of debug (including handing laptop on a ceiling to verify 1Gb/s is reacheable).... everything now is as planned.

Thnk

Guy