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AP 1702 Powering options ?

Unanswered Question
Oct 6th, 2014
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Could AP 1702i be powered by 802.3af  POE ?

In the data sheet,802.3af is not included in the powering options,and the power draw of the ap is 15W.

http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1700-series/datasheet-c78-732347.html?cachemode=refresh

 

In the getting started guide,you can use a 802.3af-compliant device to power AP 1702.

http://www.cisco.com/c/en/us/td/docs/wireless/access_point/1700/quick/guide/ap1700getstart.html

 

Which one is correct ?

Could we use 802.3af-compliant device to power AP 1702 ?

 

 

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Leo Laohoo Mon, 10/06/2014 - 14:59
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There are two methods of externally powering up the 1600/1700:  AIR-PWRINJ5 and AIR-PWR-B.  Both are the same, they provide UP TO 15.4w PoE.  

 

Ok, now here's the crunch.   1700 is an AP capable of 802.11ac (wave 1 and wave 2).  If you are planning to use 802.11ac then I'd recommend you power it up using PoE+ (20.0w PoE).  If not, then the AP will (or might) "down rate" itself to 2X3:2, instead of 3X3:2. 

Hung Tsung Chen Mon, 10/06/2014 - 18:35
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Hi Leo:

Thanks.

Is there any cisco document  or slide metioning 1700 is  capable of 802.11ac(wave 1 and wave 2) ?

I get few information of ap 1700.

Leo Laohoo Mon, 10/06/2014 - 20:03
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Is there any cisco document  or slide metioning 1700 is  capable of 802.11ac(wave 1 and wave 2) ?

Yes and no.  Let me explain.  

 

1.  According to the Data Sheet, 1700 is capable of doing 802.11ac.  This automatically means 802.11ac wave 1.  

2.  Flip the unit around and you'll see not one but TWO (2) Ethernet ports (the second one is marked as AUX).  802.11ac wave 2 APs, like the 2700, comes with two Ethernet ports.  The 2nd port will be used (in later date and firmware release) to be able to form an Etherchannel.  

Nigrofasciatum Mon, 04/20/2015 - 07:35
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There is a problem in the CDP negotiation between the AP and switch. The AP 1702 (standalone) demand to 16.8 watts ( most of 15.4W that supports PoE ) , which causes the port off and on again to restart the negotiation CDP . Now when you connect the AP directly as is ( in lightweight mode) using a controller to manage it , no problems with CDP negotiations are reported , implying that there are no problems with feeding PoE ( 802.3af )

My question is: If the AP is powered by a 802.3af switch, is the AP fully functional , or lose any functionality? Why demand 16.8 watts ?

The 2702 AP can run on 802.3af (max of 15.4W), but it will downgrade to a 3x3:3 on the 5GHz radio and a 2x2:2 on the 2.4GHz radio. Is any similar the 1702 AP?

 

Thanks

Massimo Baschieri Mon, 04/20/2015 - 08:58
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In my experience AP1702 lightweight it's not fully compatible with 802.3af power sources, i've seen in that cases the wlc suddenly disabling 5ghz interface on the ap in order to comply with power source.

I've tried with PWR-B, PWRINJ5 and old 802.3af poe switch.

 

Massimo Baschieri Fri, 07/03/2015 - 22:41
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I did the upgrade to 8.1 a few weeks ago but i didn't notice yet, and it's true, power consumption of my 1702 moved from 16,8 to 15,4.

Great.

s.quartino Mon, 02/02/2015 - 03:36
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Hi,

I have an issue not similar but close to this problem.

When using a cisco sg300-28MP (poe+ capable) with a 1702i, the controler says power injector/normal mode, and the power drawn is about 7-8 watts

When connecting the AP to a 2960X poe+, the controler says POE/full power, and the power drawn is about 16-17 watts.

I have one access point only connected on the switch, I'm using the last firmware. Do you have an idea why I'm not in full power with the sg300 ? I'd like to use the AP at their max rate

Do I need to open a case with cisco , am I alone with this issue ?

Thank you

MUQ_1899_ Tue, 06/23/2015 - 06:42
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So if I want to get the best from my AP I have to power it up with PoE+ capable switch port? Cisco haven't any 802.3at power injector?

Leo Laohoo Tue, 06/23/2015 - 15:05
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So if I want to get the best from my AP I have to power it up with PoE+ capable switch port? Cisco haven't any 802.3at power injector?

PWRINJ4

Moin Ilyas Wed, 10/08/2014 - 16:27
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The access point is 802.3af (15.4 W) compliant and can be powered by any 802.3af-compliant device.

The recommended external power supply for the access point is the Cisco AIR-PWR-B power supply. The access point can also be powered by the following optional external power sources:

Access point power injector (AIR-PWRINJ5)

Any 802.3af compliant power injector

 

 

Source: http://www.cisco.com/c/en/us/td/docs/wireless/access_point/1700/quick/gu...

Hung Tsung Chen Wed, 10/08/2014 - 18:17
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Hi All,

In normal case,if the power draw of AP is 15W,the power needed  for AP normal operation should exceed 15.4W,because of some power dissipated by the cable.

I open a case to  Cisco Presale support.The engineer says the 15 power draw of AP1702 is a conservative estimate.

He has reached to internal resource and validated that Ap1702will not exceed a 15.4W draw, meaning any 802.3af compliant power source equipment will suffice.

 

Thanks All.

Massimo Baschieri Wed, 02/11/2015 - 07:19
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Here is an output from a 3850 where a 1702i is connected to one of it's ports:

Dedalo#sh power inline gigabitEthernet 1/0/12
Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/12  auto   on         16.8    AIR-CAP1702I-E-K9   4     30.0

 

It seems that 802.af power sources are not enough if you enable both radios and ac standard.

In fact I had troubles both with Pwr-B and pwrijn5.

Cable lenght is as long as an 1,5mt patch cord.

 

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