16xAIR-LAP1252AG faulty?

[Vincenzo Santoro]

Hi,

I've 37xAIR-LAP1252AG connected to 2x3750 PoE switches. Some of them (12xAIR-LAP1252AG) are not working properly. 

1) On the same switch, the output of the "show power inline" is different whether the AP is reachable or not:

**********************

AP OK

ETOY_STACK2#sho power inline 

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)                            
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/4   auto   on         20.0    AIR-LAP1252AG-E-K9  3     20.0 
 

**********************

AP NOT OK

ETOY_STACK2#sho power inline 

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)                            
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/6   auto   on         20.0    Ieee PD             3     20.0 
 

2) On the interface where the faulty AP is connected, the mac address table is empty. 

ETOY_STACK2#sho mac address-table interface gigabitEthernet 1/0/6
          Mac Address Table
-------------------------------------------

3) The faulty APs have all red lights

I tried to change the power inline setting (auto, max 20000...) on the port of the switch but it doesn't help. Even changing the port on the switch it doesn't help.

Any advice? Should I do an RMA?

Thanks and regards,

VIncenzo

[Leo Laohoo]

Do this: 

1.  Command:  test cable tdr interface Gi 1/0/6; 

2.  Wait for approximately 5 seconds; 

3.  Command:  show cable tdr interface Gi 1/0/6; and

4.  Post the output to #3.

Read THIS.

[Vincenzo Santoro]

Unfortunately I can't execute those commands but I'm sure 100% that it's not a cable issue since we're speaking about 12 APs out of 37.

[Stephen Rodriguez · Accepted solution]

I tend to agree with Leo, it does sound like a cabling issue to start. POE runs over different pairs than the data does.

You could try brining the AP to the closet and connecting it with just a patch cord as a test as well.

HTH,

Steve

[Vincenzo Santoro]

Please find attached the results of the Time-Domain Reflectometer (TDR) test.

[Leo Laohoo]

Cable length is 100 metres?????

Can you post the complete output to the command "sh version"?

[Ravi Singh]

Please follow Steve and Leo advise.