Re: 1532I with FiberConnection injector

FallsTownGeek · ‎07-07-2016

We installed 3 1532I APs utilizing FiberConnections GatorLink system which provides POE+ via a fiber to copper media converter combined with a POE+ injector. The APs connect to the 2504 controller, but are showing to be in low power mode.

We have disabled CDP on the 3560 they are uplinked to and configured the APs for power injector, but they continue to resort to low power mode. What am I missing?

Stats:

Software Version: 8.0.133

Gator Link DataSheet: http://fiberc.com/collateral/fbc/GatorLink_datasheet_2012.pdf

Thanks,

Clint

amaoxrebeli · ‎12-11-2017

Same problem here. CDP cannot be disabled on AP1532I via CLI.

Manish Mathur · ‎12-11-2017

Hi Both,

What is the power that the AP is consuming right now ? Can you do a "show power inline" for the switch interface where the AP is connected ? This will show the AP power class being detevcted by the switch and the power being provided to the AP.

Going with the theory of PoE on Cisco switches :

"The switch detects a Cisco prestandard or an IEEE-compliant powered device when the PoE-capable port is in the no-shutdown state, PoE is enabled (the default), and the connected device is not being powered by an AC adaptor". So, in your case , all the three conditions are being met. Power injector is not mentioned in this statement. I guess , the switch is providing the bare minimum inline power which it proides to every PD connected to it. As you have disabled CDP , the further CDP negotiations are not taking place which asks for more power from the switch. Thus, I think , CDP is working as it should.

Can you also run "power inline never" on the switch interface where this AP is connected ? See if that stops the switch providing power to the AP .

Cheers,

Manish

amaoxrebeli · ‎12-11-2017

There is no such command available on 1532I so no way of seeing power consumed on the AP side. As for the switch, my 3560 24POE can only provide 15k mw power per port and that cannot be changed. So what I did was connect AP to power injector (non cisco) and disable CDP both on switch and AP (on AP I had to do it via WLC web interface, because no such command is available from AP CLI) and then AP starts with full power and radios down but later changes to low power and still radios down. Looks like 1532I only works with cisco power injector We gonna know that for sure in 10 days when that injector is delivered. :((

Manish Mathur · ‎12-11-2017

You are correct. I asked to run the command "show power inline" on the switch and not the AP. AP 1532 is a 802.3at compliant PD. The 3560 24 port PoE switch that you have , is capable of supplying maximum 15.4 Watts power on a port. By default , when an AP boots up on a PSE , the switch will provide 15.4 Watts to the AP as default. Later on , depending on the CDP power negotiations or Intelligent power management , Cisco switches provide the highest power required by the AP or the highest that the switch port can provide. In this case, it is 15.4 Watts. For Cisco 1532I APs the power required is ~ 25 watts. This may be leading to the low-power situation. So, this triage was to ensure that the AP is in fact not accepting the power from the switch but the injector.
Even on 3560 Catalyst switch , the power budget allocation can be modified with the command "power inline consumption". Similarly , you can disable PoE power on a particular interface by the command "power inline never". This clarifies what your 3560 switch is capable of in terms of commands .
Now, coming to the actual issue , the 1532 data sheet doesn't even mention that this AP supports a power injector:
https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1530-series/data_sheet_c78-728356.html
whereas the data sheet for 1552 outdoor APs mentions the acceptable use of a power injector:
https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1550-series/data_sheet_c78-641373.html
This may be either a miss in the documentation ? or the answer to your issue ?
Cheers,
Manish

amaoxrebeli · ‎12-11-2017

Now, coming to the actual issue , the 1532 data sheet doesn't even mention that this AP supports a power injector:
https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1530-series/data_sheet_c78-728356.html
whereas the data sheet for 1552 outdoor APs mentions the acceptable use of a power injector:
https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1550-series/data_sheet_c78-641373.html
This may be either a miss in the documentation ? or the answer to your issue ?
Cheers,
Manish

Actually 1532 supports POE. It is mentioned in the title and in diagram:

Powering Options

1530I/1530E

● 24 to57 VDC

● Power over Ethernet (PoE) (802.3at or Cisco Universal PoE [UPoE])

Power Consumption

1530I: < 30 W

1530E: < 25 W

But I guess it is extremely sensitive to Injector manufacturer, because I tried 2 different vendor injectors and in both cases CDP (despite it was turned of on switch and on AP) returned:

%CDP_PD-2-POWER_LOW: All radios disabled - NON_CISCO-NO_CDP_RECEIVED

Manish Mathur · ‎12-11-2017

You may be correct. You will get the answer once you receive the Cisco power injector.
Although , even after disabling CDP on both sides , receiving these messages doesn't seem in line. The AP is getting sufficient power only to boot it up but not to power up the radios.
Cheers,
Manish