AP unable to find controller when using Power Injector

[Brendan Marmont]

I'd like to move our AP connection to 1GB, we don't have any POE GB switches in location, I used a Power Injector to supply power to the APs, however when I put this in the mix the AP continuously restarts and is not able to see the controller?

WLC 5508 7.6.130.0

AP AIR-CAP3502I-N-K9, Version ID V01

Interface configuration is identical

interface GigabitEthernet0/1
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 228
 switchport trunk allowed vlan 228,230,231
 switchport mode trunk
 spanning-tree portfast

Any ideas?

Thanks

Brendan

[Leo Laohoo]

when I put this in the mix the AP continuously restarts and is not able to see the controller? 

Typical issue when you have a cabling problem.  Is the switch a 3560G?

[Brendan Marmont]

Yes it is "WS-C3560G-48TS"

The original switch was a "WS-C3560V2-48PS"

I am simply taking the feed from the AP, running it to the server room, patching to the Power Injector, patching to the C3560G.

[Leo Laohoo]

3560G supports TDR.  I have no idea how "accurate" the results are with the power injector in place but you could give it a try.  

1.  Command:  test cable tdr interface Gi 0/1;

2.  Wait for approximately 5 to 7 seconds; 

3.  Command:  show cable tdr interface Gi 0/1; and

4.  Post the output to # 3. 

NOTE:  I cannot guarantee the accuracy of the result due to the IOS firmware and the inherit issue with TDR and 3560-series line of switches.

[Brendan Marmont]

Interface Speed Local pair Pair length        Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi0/9     1000M Pair A     41   +/- 4  meters Pair A      Normal
                Pair B     40   +/- 4  meters Pair B      Normal
                Pair C     45   +/- 4  meters Pair C      Normal
                Pair D     41   +/- 4  meters Pair D      Normal

If I set the interface mode access, the AP is reachable. Fails only when in Trunk mode.

[Leo Laohoo]

If I set the interface mode access, the AP is reachable. Fails only when in Trunk mode.

Oh.  Ok, I didn't see this.  

If you've got a controller, the ports should be access ports.  If you're running autonomous IOS then the ports should be 802.1Q Trunk.