Hi folks,
I’ve a question about powering an RB5009 router by an POE switch.
What will happen, if an RB5009UPr+S+IN gets connected by
an single ethernet cable to an power delivering switch? Can the router, since it is powered only via POE by the switch, also supply additional connected peripherals like cameras or phones?
multiple ethernet cables to the same power delivering switch? Might port(s) get electrical damaged even when both sides - router and switch - deliver power out on their ports or will the router detect an power delivering switch on each port by default and therefore will cumulate all incoming power for delivering it out the the above mentioned peripherals?
Would it be a better solution to electrically isolate the router from the switch (although I’d like to save space for the additional required power supply) by using SFP+ and some fiber connection or even connect all POE peripherals to the POE switch and use instead of the RB5009UPr+S+IN an RB5009UG+S+IN getting POE powered on ethernet 1?
Thanks in advance for any helpful comments.
When you want to power a RB5009 using PoE and then use the RB5009 to power other things, you will easily exceed the max power for PoE from the switch. So you should first check that. It will probably not work.
I use several RB5009UPr+S+IN to PoE-power other things (WiFi AP, phones) but always only with its own power supply.
Multiple PoE-in will probably work but it is a bit of a kludge.
Indeed it will be better to put the PoE devices directly on the switch, if necessary configure a VLAN trunk on the connection between RB5009 and switch to transport the required networks.
You can always extract the (passive[1]) PoE power before the RB5009 with a splitter and then power the RB5009 normally through its jack.
Of course it all depends on what the switch can provide, both as PoE (non-) standard and voltage level and power deliverable and on which device(s) are behind the RB5009 and their absorption.
Loosely you should anyway not exceed what the 802.3bt (type 4) allows, 90W or so, but (using good, thick, cables) with passive you can go up to 130W or so, example of a 130W splitter/injector: https://tyconsystems.com/homepage/shop/poe-inj-1000-wt/
[1] with active PoE the limit is 90W of the 802.3bt type 4 and compatible splitters cost AFAIK serious money