If you’re using PoE-out to power other devices, the board will choose the source with the highest voltage (DC jack or the 2-pin connector) to power those.
As far as I see, they used a PoE-Injector to “split” the power to the DC jack/2-pin and power the PoE-OUT-bus that way.
I have same setup like on the picture with POE-injector and it sucessfully powers RB5009 + hAP AX² + hAP AX² + cAP AX.
My question, can I power from my central CRS328 (with UPS) with such an injector the RB5009 and via that, an additional cAPax?
If yes, which config on the CRS328? PoE Auto or forced? Voltage High or Low?
I believe the CRS328 works at 48V, so it will output on a PoE port 450 mA.
That makes the power output on that port 48V*0.45A=21.6W.
It is basically a “beefy” 802.3af (specs are 12.95 W, actually 15.40W since it is the PSE) or a “skinny” 802.3at (specs are 25.50 W, actually 30W since it is the PSE) level. https://en.wikipedia.org/wiki/Power_over_Ethernet
Even if you find a “high” voltage power supply (and you somehow fit it in the CRS328 and the device can actually work at 57V) 57V*0.45A=25.65W, and you have to consider some loss due to the length of the ethernet cable.
The RB5009 from specs needs at least 16 W.
The cAP Ax from specs needs at least 11 W.
Total (at least) 27 W.
No way you can power both from a single CRS328 port. (it may work because of the actual power needs of the RB5009 and of the cAP Ax are a little less than specs in real life, but it is not advised)
And in theory not even a “proper” external 802.3at power supply, you would need an 802.3bt (specs are 51W for Type 3) one and a corresponding splitter.
The CRS328 “brochure” specs 53V, thus PoE port should provide up to ~24W (not 30W as mentioned in specs.and brochure).
This does not change anything for OP though.
Good catch.
So on the product page it has:
Max out per port output (input 18-30 V) 1000 mA
Max out per port output (input 30-57 V) 450 mA
On the brochure it is specified 26V/53V and:
Each port can provide up to 30 W with high voltage, and 26 W with low voltage power output.
Strange math.
261=26->26W OK
530.45=23.85-> 30W
To make 30 W out of 53V one would need 570 mA as 53*0.57=30,21
but if the brochure is correct and the product page is wrong, 30W would be good for the specific OP case, as it would be the needed 27W+10%.
CRS328 with RB5009 only (PoE “forced on” [auto does NOT work] and set voltage to high [low works too but tested with RB5009 only]):
CRS328 with RB5009 + cAPax (picture shows again CRS328-port):
And finally RB5009 + cAPax + everything else (TV, NUC, RetroPi, DSL-Modem, ATA) picture shows agian CRS328-port:
This is the cAPax-port on the RB5009:
