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Forum Discussion
GS308EPP 8023.af support 24v passive Ubiquiti AP
Hi, can anyone tell me if the GS308EPP will support a 24 volt passive Ubiquiti AP with 8023.af? All the documentation talks about power consumption, watts,... but not volts. I'm assuming the GS308EPP outputs 48v and will actively sense the power requirement. What about 24 volts?
It would be nice to use the switch to power the 24 volt AP, without using the POE injector.
Thank you
6 Replies
The GS308EPP does only support active PoE, an active IEEE compliant powered device must be connected to the IEEE PSE before the switch does bring up a voltage to the wires.
Mute to talk about voltage - because it's not cheap passive PoE. The IEEE standards for 802.3af, 802.3at, and 802.3bt has certainly definitions for the exact voltages - the user does not have to care about however. That's why you rarely see voltages on the spec sheets.
To answer the question:
dmac001 wrote:
Hi, can anyone tell me if the GS308EPP will support a 24 volt passive Ubiquiti AP with 8023.af?
No!
dmac001 wrote:
It would be nice to use the switch to power the 24 volt AP, without using the POE injector.
No, we don't need the mess Ubiquiti has in their product offerings, with passive PoE of 24V, 48V, 54V -and- on top also some coverage of the standard 802.3af, 802.3at, and 802.3be.
Honestly, Netgear has a very small number of products in their offering, which are indeed passive PoE, too: The WBC502, Insight Instant Wireless AirBridge.
These are identified as a proprietary 24V PoE system - making a clear difference from IEEE standard PoE.
Thanks for the replies. I'm still a little confused. My Ubiquiti AP supports both 24v passive POE and 802.3af POE. The GS308EPP supports 802.3af POE and 802.3at POE+ so "in theory" I should be able to power the AP from one of the GS308EPP ports.
Do I risk this or use the 24v passive injector?
Thanks again,
Don
dmac001 wrote:
My Ubiquiti AP supports both 24v passive POE and 802.3af POE.
They had do support both because Ubiquity has to much passive PoE devices in the market.
dmac001 wrote:
The GS308EPP supports 802.3af POE and 802.3at POE+ so "in theory" I should be able to power the AP from one of the GS308EPP ports.
What theory please? How do you expect a IEEE 802.3at PoE PSE provide power for a non-standard compliant "passive" 24V device? Or have you read somewhere in a Netgear PoE switch data sheet e.g. this GS308EPP does allow powering "passive" 24V devices'
dmac001 wrote:
Do I risk this or use the 24v passive injector?
No risks involved from a industry standard 802.3af, 802.3at, or 802.3bt PSE - be assured you can connect any industry Ethernet device to any of these PSE ports without a risk. Very different with using non-standards compliant passive injectors or passive PoE switch ports or the like.
For reasons, the standards were carefully defined and implemented. This is why the industry has preferred IEEE 802.3 compliant PoE implementations, preferred over some dirt cheap and risky design. Yes, it's additional effort for the PSE as well as for the PD hardware design. Good to see Ubiquiti Networks, Motorola [new name: Cambium] and MikroTik among with some niche players is on the right way, also supporting industry standards in the PoE environment.
Some five or six years ago, Ubiquity Networks started moving all new UniFi devices to 802.3af/at/bt, depending on power requirements. Unclear is what will happen in the lifecycle of the EdgeMax using (mostly) 24V passive, the big big AirFiber radios appear still use 54V passive when I have it right. Time of "passive" PoE will come to an end as the standard can provide 60W at the PSE (with 51W at the PD) 802.3bt Type 3, resp. 99.9W at the PSE (with 71.3W at the PD after max cable loss) in 802.3bt Type 4.
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