Switch 2960s doesn't power an iw3702 ap

[Eduardo Camio]

Hi all,

I have the following issue.

I'm connecting an iw3702 ap directly to a WS-C2960S-24PS-L and nothing happens, the ap never comes up.

If I take the same ap to a different switch in another location it turns up well and register on wlc without a problem. This AP is a WS-C2960S-48FPS-L.

I have changed the IOS just in case I'm hitting some bug from 12.2.55.se7 to 12.2.55.se12 to 15.0.2.se11 and nothing changes.

The WS-C2960S-24PS-L powers up another devices (two NEC ip phones) without a problem, and there is enough power left on the switch.

I connected the ap on several ports (included those that power ap nec phones) and never turns up.

2960Sw-01#sh power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 370.0 11.0 359.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto off 0.0 n/a n/a 30.0
Gi1/0/2 auto off 0.0 n/a n/a 30.0
Gi1/0/3 auto off 0.0 n/a n/a 30.0
Gi1/0/4 auto off 0.0 n/a n/a 30.0
Gi1/0/5 auto off 0.0 n/a n/a 30.0
Gi1/0/6 auto off 0.0 n/a n/a 30.0
Gi1/0/7 auto off 0.0 n/a n/a 30.0
Gi1/0/8 auto off 0.0 n/a n/a 30.0
Gi1/0/9 auto off 0.0 n/a n/a 30.0
Gi1/0/10 auto off 0.0 n/a n/a 30.0
Gi1/0/11 auto off 0.0 n/a n/a 30.0
Gi1/0/12 auto on 4.0 Ieee PD 1 30.0
Gi1/0/13 auto off 0.0 n/a n/a 30.0
Gi1/0/14 auto off 0.0 n/a n/a 30.0
Gi1/0/15 auto off 0.0 n/a n/a 30.0
Gi1/0/16 auto on 7.0 Ieee PD 2 30.0
Gi1/0/17 auto off 0.0 n/a n/a 30.0
Gi1/0/18 auto off 0.0 n/a n/a 30.0
Gi1/0/19 auto off 0.0 n/a n/a 30.0
Gi1/0/20 auto off 0.0 n/a n/a 30.0
Gi1/0/21 auto off 0.0 n/a n/a 30.0
Gi1/0/22 auto off 0.0 n/a n/a 30.0
Gi1/0/23 auto off 0.0 n/a n/a 30.0
Gi1/0/24 auto off 0.0 n/a n/a 30.0

Any advice will be appreciated.

[Flavio Miranda]

Hi

Do you have CDP enable, can you see the AP through CDP or LLDP?

-If I helped you somehow, please, rate it as useful.-

[Eduardo Camio]

Yes it is enable. I can see other cisco switches.
The ap is not visible because it never powers up.

[Flavio Miranda]

The question about CDP is because switch does not provide power on the port unless it identify that on that port there's a power device.

 In your case, looks like the switch is not identifying the AP as a power device, thus, does not providing power. CDP is the most common mode for device identify.

-If I helped you somehow, please, rate it as useful.-

[Leo Laohoo]

Do the following:
1. Command: test cable tdr interface <BLAH>;
2. Wait for approximately 5 to 7 seconds for the process to run;
3. Command: show cable tdr interface <BLAH>; and
4. Post the complete output to #3.

[Eduardo Camio]

Leo,

Thanks for your help, below the output required:

2960Sw-01#show cable tdr interface gi1/0/23
TDR test last run on: July 09 12:28:04

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/23 auto Pair A 148 +/- 0 meters Pair B Normal
Pair B 147 +/- 0 meters Pair A Normal
Pair C 3 +/- 1 meters Pair C Open
Pair D 4 +/- 1 meters Pair D Open

Note: The ap is directly connected to the switch with the Cisco RJ45/M12 cable.

Regards. 

[Leo Laohoo]

Good gosh! Who signed off on this?
Pair A & B are >100 metres.
Pair C, which controls PoE, is not terminated. This is why the AP ain't getting power.
Pair D, which controls GigabitEthernet, is also not terminated.

[Eduardo Camio]

I will double check with people on site about physical connectivity.
It's supposed that the AP is connected to the switch with rj45/m12 patch cord right now. So the length should be 3 meters.
I let you know any news.
Thanks.