Power Injector not working

[dbuckley77]

Saw some funny power injector behavior.  AIR-PWRINJ3

When using the power injector with a 90 foot run to the WAp we could ping the WAP but the controller showed it as down.  When powering the WAp with a brick at the end of the very same 90 ft run it shows up in contoller.  When using the injector with a 10 foot patch cable it shows up in the controller.

Anyone seen this?
 

[Leo Laohoo]

Common denominator is the 90 feet cable run could be faulty.  If it's not showing up in the controller, but the AP is powering up, this means either Pair A or Pair B of the cable is not properly terminated. 

Get a TDR test on the 90 feet cable.

[dbuckley77]

The cable has been tested to be good and the cable works without the power injector.

[Leo Laohoo]

The cable has been tested to be good and the cable works without the power injector.

Which cable?  

There are TWO cables that need to be tested.  One cable going from power injector to the AP and one cable from the power injector back to "home". 

How was the cable(s) tested?  What method?

[dbuckley77]

As it is now there is a 90 foot cable going directly from the switch to the WAP.  There is no power injector.  there's an ac adapter on the WAP.  It works fine and this 90 foot cable has been tested to be good.

When we use that 90 foot cable to a power injector at the switch and a number of other short, known good patch cables to the switch it does not work.  The WAP is pingable but not seen by the wireless controller.  it does not make any sense.

[Leo Laohoo]

Errrr ... I've never seen this happen before but could you replace your power injector and see what happens?