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PoE Power Draw at PSE for Cisco AP 3702

Answered Question
Feb 9th, 2014
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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

Correct Answer by Rasika Nayanajith about 3 years 6 months ago

No worries, thanks for rating the response as well


Rasika

Correct Answer by Rasika Nayanajith about 3 years 6 months ago

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

Copyright (c) 1986-2013 by Cisco Systems, Inc.

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


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Correct Answer
Rasika Nayanajith Sun, 02/09/2014 - 01:30
User Badges:
  • Purple, 4500 points or more
  • Cisco Designated VIP,

    2017 Wireless

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

Copyright (c) 1986-2013 by Cisco Systems, Inc.

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 ****

Correct Answer
Rasika Nayanajith Sun, 02/09/2014 - 01:37
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  • Purple, 4500 points or more
  • Cisco Designated VIP,

    2017 Wireless

No worries, thanks for rating the response as well


Rasika

SHABEEB KUNHIPOCKER Sat, 11/08/2014 - 03:50
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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 Sat, 11/08/2014 - 13:57
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  • Purple, 4500 points or more
  • Cisco Designated VIP,

    2017 Wireless

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

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betha yamini Mon, 02/02/2015 - 00:39
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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 Sat, 09/26/2015 - 21:00
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so based on the example above, drawing 16.8w means it's running 4x4 or 3x3 mode?

Thanks much!

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