Inline powered WAP connected to an SFP module

[RickGiles]

Greetings all!

I have an Aironet 1142 WAP in autonomous mode with inline power that I would like to connect to a SFP module to make use of the 1GB link capabilities.

The switch is a 3560 V2 series PoE-24 with a GLC-T 30-1410-03 B2 V03 SFP module.

When the data side of the inline power module is connected to the SFP, the WAP will not power up. If I connect it to one of the other switch ports, the WAP comes on after about 5 to 10 seconds.

I'm guessing that there is some discovery that happens on the Fast Ethernet ports that doesn't happen on the Gigabit SFP modules.

I know the SFP module works as I can plug my laptop in and get a 1Gb connection.

I can use one of the FE port to power the WAP but I would like to keep those free for client systems and make use of the 1Gb channel if possible for the WAP.

[Leo Laohoo]

The description provided is typical of a cable issue/faulty patch cable.  Try running a TDR test on the patch cable.

[RickGiles]

Unfortunately, I don't haves access to a cable tester that can do TDR.

I have, however, tried several different cables with the same result.

[Leo Laohoo]

Read THIS.

[RickGiles]

Ya learn something new everyday.

This is on an SFP module port...

"Cisco GLC-T/GLC-TX SFP module does NOT support TDR." source - THIS

[Leo Laohoo]

Is there a switch, with GigabitEthernet & supports TDR, that you can temporarily use?

[RickGiles]

There is, but it will take me a day to make use of it. :)

[RickGiles]

This is the WAP connect directly to the switch with a 2.1 meter cable:

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/5 1000M Pair A 0 +/- 4 meters Pair A Normal
Pair B 0 +/- 4 meters Pair B Normal
Pair C 0 +/- 4 meters Pair C Normal
Pair D 0 +/- 4 meters Pair D Normal

Port Name Status Vlan Duplex Speed Type
Gi1/0/5 connected 200 a-full a-1000 10/100/1000BaseTX

This is the WAP connected with and inline power module, but it is not a 1Gb capable module. I had to send out the one I had and it will be back/replaced next week (I hope):

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/5 auto Pair A 2 +/- 4 meters Pair B Normal
Pair B 2 +/- 4 meters Pair A Normal
Pair C 0 +/- 4 meters Pair C Normal
Pair D 0 +/- 4 meters Pair D Normal

Port Name Status Vlan Duplex Speed Type
Gi1/0/5 connected 200 a-full a-100 10/100/1000BaseTX

In any case, The WAP powers up in both instances as you see.

Do I need to use a longer cable?

[Leo Laohoo]

If the APs are connected to power injectors, use the TDR to test all the cables involved.