Solved: PoE Power Draw at PSE for Cisco AP 3702

mlinder01 · ‎02-09-2014

Can anyone provide a "show inline power" for a Cisco AP 3702 without expansion modules but with 802.11ac activated so we can see how much PoE-Power (Watt) the Access Point really needs at PSE (Switch).

Thanks

Manuel

Rasika Nayanajith · ‎02-09-2014

Hi

Here is one of my 3702i without an expansion module connected 3750X series switch output for your reference

BUN-DS01#sh power inline

Interface Admin Oper Power Device Class Max

(Watts)

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

.

Gi2/0/11 auto on 9.5 IP Phone 8961 4 30.0

Gi2/0/12 auto on 16.8 AIR-CAP3702I-Z-K9 4 30.0

BUN-DS01#sh cdp ne g2/0/12 de

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

Device ID: L3702-1

Entry address(es):

IP address: 10.15.7.41

Platform: cisco AIR-CAP3702I-Z-K9, Capabilities: Router Trans-Bridge

Interface: GigabitEthernet2/0/12, Port ID (outgoing port): GigabitEthernet0.1

Holdtime : 163 sec

Version :

Cisco IOS Software, C3700 Software (AP3G2-K9W8-M), Version 15.2(4)JB3, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Compiled Wed 18-Dec-13 22:30 by prod_rel_team

advertisement version: 2

Duplex: full

Power drawn: 16.800 Watts

Power request id: 3462, Power management id: 3

Power request levels are:16800 15400 13000 0 0

Power Available TLV:

Power request id: 0, Power management id: 0, Power available: 0, Power management level: 0

Management address(es):

HTH

Rasika

**** Pls rate all useful responses ****

View solution in original post

Rasika Nayanajith · ‎02-09-2014

No worries, thanks for rating the response as well

Rasika

View solution in original post

Rasika Nayanajith · ‎02-09-2014

Hi

Here is one of my 3702i without an expansion module connected 3750X series switch output for your reference

BUN-DS01#sh power inline

Interface Admin Oper Power Device Class Max

(Watts)

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

.

Gi2/0/11 auto on 9.5 IP Phone 8961 4 30.0

Gi2/0/12 auto on 16.8 AIR-CAP3702I-Z-K9 4 30.0

BUN-DS01#sh cdp ne g2/0/12 de

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

Device ID: L3702-1

Entry address(es):

IP address: 10.15.7.41

Platform: cisco AIR-CAP3702I-Z-K9, Capabilities: Router Trans-Bridge

Interface: GigabitEthernet2/0/12, Port ID (outgoing port): GigabitEthernet0.1

Holdtime : 163 sec

Version :

Cisco IOS Software, C3700 Software (AP3G2-K9W8-M), Version 15.2(4)JB3, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Compiled Wed 18-Dec-13 22:30 by prod_rel_team

advertisement version: 2

Duplex: full

Power drawn: 16.800 Watts

Power request id: 3462, Power management id: 3

Power request levels are:16800 15400 13000 0 0

Power Available TLV:

Power request id: 0, Power management id: 0, Power available: 0, Power management level: 0

Management address(es):

HTH

Rasika

**** Pls rate all useful responses ****

mlinder01 · ‎02-09-2014

Awesome...Many thanks!!!

Rasika Nayanajith · ‎02-09-2014

No worries, thanks for rating the response as well

Rasika

SHABEEB KUNHIPOCKER · ‎11-08-2014

Hi Rasika,

First of all let me thank you for the wonderful blog which you own for wireless. It helped me a lot during implementing various wireless projects. I have a question regarding the 3702I access points. We have a project where we will connect 3702I access points to the old 3560 POE switches. I know we need more power than 15.4W as per the data sheet for the access point. But what is the draw back if we run the access point with 15.4W??.

Thanks in advance

Shabeeb

Rasika Nayanajith · ‎11-08-2014

Hi Shabeeb

Thanks for reading my blogs & the feedback.

If 3700 with 15.4W, simply it will turn off one radio chain.So performance will be less compare to its operation with 4x4 radio chain.If you use module (WSSI) with 3700 & feed from 15.4W, then it further reduce to 2x2 by turning off two radio chains.

You can refer this for detail (refer fig 83 of the given link for the summary)

http://www.cisco.com/c/en/us/td/docs/wireless/technology/apdeploy/7-6/Cisco_Aironet_3700AP.html#pgfId-99003

The AP 3700 with integrated 802.11ac wave-1 radio is designed to run from Power over Ethernet (PoE) sources, local power, or via mid-span or power injector. If the AP 3700 is powered by PoE and the source is 802.3af (15.4 Watts) the AP will come up and fully function in a 3x3:3 mode, for enhanced performance additional power sources such as 802.3at, enhanced PoE, Cisco PoE Injector-4, or local power may be used. With additional power (greater than 15.4W) supplied, the 3700 will shift into the 4x4:3 mode.

If the customer has lower PoE requirements and still wishes to use the AP 3700 and say the WSSI module, the AP 3700 will still function with the module but in a 2x2:2 mode with the module enabled.

HTH

Rasika

**** Pls rate all useful responses ****

betha yamini · ‎02-02-2015

Hi Rasika,

does operating 2x2:2 effects flex connect mode operation.

In same condition , local mode works fine. For flex mode, AP is up some time and later disassciotates with the controller

RabbitSF · ‎09-26-2015

so based on the example above, drawing 16.8w means it's running 4x4 or 3x3 mode?

Thanks much!

j.t.faust · ‎09-29-2015

!6.8W is full power for a 3702 AP, so 4x4 mode.

The question I have is how to suppress/stop the alerts in Cisco Prime? We know the 15.4 is not full power, but have not had the chance to replace the older switches.