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WAP 121 booting over PoE problems with Cisco Catalyst WS3550-24PWR

I can't boot my WAP121 over PoE (supplied by Cisco Catalyst WS3550-24PWR).

PWR and LAN link is going up and down periodically (c3550 console message) - flapping. WLAN interface doesn't go up at all.

When connected to external power it works fine. What is important, after WLAN interface goes up, I can disconnect external power and WAP121 continues to work using PoE (so, the problem persists only during startup phase).

I checked this with two different WAP121 - same problem.

So, the whole network is useless - after power down I need to connect external power to each and every AP just for booting :-(

The switch allocates 15.4W per WAP and I've checked only 6W is necessary to power APs... I know CDP could be used to establish PoE dialogue between PSE (power sourcing equipment) and CPE but no idea how to enable CDP on WAP121 (but I don't think I could help at all)?

Any hints about this...???

__________

Software versions:

WAP121: 1.0.2.3

Catalyst: 12.2(44)SE6

__________

here is output from Catalyst "show power inline" command (WAP121s connected to FE0/15 and FE0/24):

Available:360(w)  Used:30(w)  Remaining:330(w)

Interface Admin  Oper       Power   Device              Class Max

                            (Watts)                           

--------- ------ ---------- ------- ------------------- ----- ----

Fa0/1     off    off        0.0     n/a                 n/a   15.4

Fa0/2     off    off        0.0     n/a                 n/a   15.4

Fa0/3     off    off        0.0     n/a                 n/a   15.4

Fa0/4     off    off        0.0     n/a                 n/a   15.4

Fa0/5     off    off        0.0     n/a                 n/a   15.4

Fa0/6     off    off        0.0     n/a                 n/a   15.4

Fa0/7     off    off        0.0     n/a                 n/a   15.4

Fa0/8     off    off        0.0     n/a                 n/a   15.4

Fa0/9     off    off        0.0     n/a                 n/a   15.4

Fa0/10    off    off        0.0     n/a                 n/a   15.4

Fa0/11    off    off        0.0     n/a                 n/a   15.4

Fa0/12    off    off        0.0     n/a                 n/a   15.4

Fa0/13    off    off        0.0     n/a                 n/a   15.4

Fa0/14    off    off        0.0     n/a                 n/a   15.4

Fa0/15    auto   on    15.4    Ieee PD                  15.4

Fa0/16    off    off        0.0     n/a                 n/a   15.4

Fa0/17    off    off        0.0     n/a                 n/a   15.4

Fa0/18    off    off        0.0     n/a                 n/a   15.4

Fa0/19    off    off        0.0     n/a                 n/a   15.4

Fa0/20    off    off        0.0     n/a                 n/a   15.4

Fa0/21    off    off        0.0     n/a                 n/a   15.4

Fa0/22    off    off        0.0     n/a                 n/a   15.4

Fa0/23    off    off        0.0     n/a                 n/a   15.4

Fa0/24    auto   on    15.4    Ieee PD                  15.4

2 REPLIES 2
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Rising star

Good morning

Hi Rafal, thanks for using our forum, my name is Johnnatan and I am part of the Small business Support community. The “w” means watts, they are the consumption per the switch port, you have to look out for the voltage “v”, as you know the WAP121 needs 12v. If you could provide me this information I could help you more, 

I hope you find this answer useful,

*Please mark the question as Answered or rate it so other users can benefit from it*

Greetings,

Johnnatan Rodriguez Miranda.

Cisco Network Support Engineer.

“Please rate useful posts so other users can benefit from it” Greetings, Johnnatan Rodriguez Miranda. Cisco Network Support Engineer.
Highlighted
Rising star

Hello Mr. Federowicz,

I got your email, I am glad we were able to get this working for you through our conversation. Please be sure and update your post here and include the steps you used to fix the issue. This will allow others to benefit from your success.

Thanks

Eric Moyers    .:|:.:|:.

Cisco Small Business US STAC Advanced Support Engineer

CCNA, CCNA-Wireless

866-606-1866 ext 601027

Mon - Fri 09:00 - 18:00 (UTC - 05:00)

*Please rate the Post so other will know when an answer has been found.