Hello, I see specs say 3 different power inputs including POE for the CRS305.
Questions:
(1) does it draw on all 3 simultaneously or does it failover?
(2) If failover, what priority?
(3) Is the GBPOE adapter suitable?
(4) Is the RBPOE adapter suitable?
I would like to use 12v source voltage which is supposed to be within spec for the CRS305.
Interesting – I hadn’t considered highest voltage as logic. Then I assume that POE will be lowest in my case because of voltage drop on smaller wires.
And in looking at the Mikrotik injectors more closely I think that voltage drop is the reason it says 18v on the low end in a few specs. The product description for the old model said that 18v is recommended lower threshold (9v is spec minimum) to account for voltage drop on the wires.
Looking at photos of the new adapter and I can see 9-48v is stamped on it. So I think they are saying 18v in some places for the same reason.
EDIT: this may not be the newest version I now realize (based on color scheme). I ordered 2 qty of “RBGPOE” but it did not show current color scheme so I am unsure what I will get. In any case, whichever comes, I think (hope) it will work since it is just passing through. Voltage drop should not be an issue in my case since I am using a tiny cable, just to benefit from a third power source input. I just happens that I have exactly 3 sources so it is convenient to use the built in switching instead of rigging up my own.
Is it safe to assume that POE is isolated from the two DC jacks?
I am looking to use all three inputs and have the device select between them. I don’t care which input the device uses or if it can somehow use all at once. Just as long as I don’t short out the device or m power sources.
The product info talks about “two dc jacks for redundancy” but doesn’t explicitly say there are three independent inputs (when counting POE). I assume they would have planned for power on any of them … or provided some warning not to use POE and another jack at the same time. Correct?
They are for sure designed In a way to be able to work when any subset of them is connected (each with it’s own voltage).
But I can’t say anything about how exactly are they isolated from one another.
