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Bronze

Power problems with 1252's

Hi,

I've been reading through the forum and thought we have done everything we need to do to get our twenty 1252's at full PoE levels. I know this is beating a dead horse but I'd love to get this fixed.

We have three stacks of WS-C3750E-48PD's running IOS version 12.2(44)SE1. All the switches have the C3K-PWR-1150WAC power supply in them to reach full PoE levels for our 1252's connected to the switches. Each stack has either three or four switches in the stack, five AP's on stack one, ten on stack two and five on stack three....the AP's are spread between the switches in the stack. All the AP ports have been configured like....

interface GigabitEthernet1/0/16

description WAP - Front Desk

power inline port maximum 20000

switchport trunk encapsulation dot1q

switchport trunk native vlan 900

switchport trunk allowed vlan 140,144,145,900

switchport mode trunk

end

!

Interface Admin Oper Power Device Class Max

(Watts)

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

Gi1/0/16 auto on 0.0 AIR-LAP1252AG-A-K9 3 20.0

Interface AdminPowerMax AdminConsumption

(Watts) (Watts)

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

Gi1/0/16 20.0 20.0

I noticed on my 4404 controller that the AP's are at "Medium 15.4W" and when I brought up WCS yesterday I got twenty critical alerts reporting the power issue. We do have Cisco IP phones running here as well but there pulling between 6W and 15W depending on the phone....most are 7941's pulling 6.3W per port. Am I missing something here??

10 REPLIES
Hall of Fame Super Silver

Re: Power problems with 1252's

I have seen that when running Version 12.2(44)SE2. I can't remember or find the bug id for that, but it was fixed on a later version of code.

-Scott
*** Please rate helpful posts ***
Hall of Fame Super Silver

Re: Power problems with 1252's

Here is the bug id: CSCsm84048

It's not considered a bug, but an enhancement feature:)

-Scott
*** Please rate helpful posts ***
Bronze

Re: Power problems with 1252's

Thanks Fella5. Guess I need to upgrade....it does not say???

Hall of Fame Super Silver

Re: Power problems with 1252's

It is not a "FEATURE" in any code available as of yet. So upgrade might not help you. You can alway open a TAC case to see if they have fixed it, but I would think it would show on the bug info.

-Scott
*** Please rate helpful posts ***
Bronze

Re: Power problems with 1252's

TAC said the switch is giving the AP the power thats needed. He said he contacted the wireless group about the WCS alerts and asked me to open a case with the wireless group.

Has anyone seen a 3750-E with the 1500W power supplies, correct IOS and the correct config supply more then 15.4W to a 1252 AP? Should I be using power injectors?

Thanks.

Hall of Fame Super Silver

Re: Power problems with 1252's

I have seen that.... most of the 1252's showed 20W, but there where a few in certain stacks that showed only 15.4W. When that bug was open, we haven't heard of a fix yet. We did end up moving those ap's that didn't fully power up to power injectors. The issue is the switch shows 15.4W and the ap sows 15.4W... so why is TAC telling you to go to the wireless group about WCS? WCS just reports what the AP is showing. Did you give them the bug id?

-Scott
*** Please rate helpful posts ***
Hall of Fame Super Gold

Re: Power problems with 1252's

Are you looking to get the switch ports (connected to the AP1250) to ramp up the power to >15.4W? The command is "power inline port maximum 20000".

Enhanced Power Over Ethernet to 20 Watts for 3560-E/3750-E

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/software/release/12.2_44_se/configuration/guide/swintro.html#wp1521218

Does this help?

Hall of Fame Super Gold

Re: Power problems with 1252's

Cisco has developed new codes for the WCS/WiSM AND the AP1250 after receiving tremendous amount of complaints. The new codes will allow the 1250 to operate both radios at standard PoE rates BUT the transmission power has been scaled back.

By the way, your switch has the correct IOS version to ramp up the power inline switchport up to 20W.

Hall of Fame Super Silver

Re: Power problems with 1252's

From what I know, the new 1140's can use the 802.af standard, but not the 1250. The problem is the code is correct to supply 20mw, but in some cases you see the AP showing degraded power akin with the switch port.

-Scott
*** Please rate helpful posts ***

Re: Power problems with 1252's

The 1142 can run both radios on .af power, but it does require 5.2 code on the WLC.

__________________________________________________________________________________________ "Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin ___________________________________________________________
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