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Orbi Pro SXR80 and SXS80 with POE injector / splitter
Hello all, I'm currently trying to connect my Orbi pro satellite SXS80 as follows: switch > POE injector > RJ45 cable > RJ45 patch bay ---- RJ45 wall outlet > RJ45 cable > POE splitter > Satellit...
SXK80 doesn't support PoE input.
the further you run power over ethernet cables, the more power you lose.
The SXS80 requires 42 watt from the power supply. it might not use all that but thats what it can put out on demand.
Not sure what POE injector you're using but if its supplying "just enough" when connected with just a short cable, the longer run and patch panels might be causing enough lose that it won't power it.
But if it runs off the injector/splitter directly connected or with a short cable but not with the extender run/patch panels, it tends to indicate thats where your power lose is coming from.
The problem is not resolved by a "more powerful PoE injector" - simply there are none (or not many) of these.
First problem is that the voltage is just 12 V in this use case. The resistance of a single pair, two pairs of passive "PoE", or even four pairs of AWG 24 wires is simply to high, the voltage drop is much to high to operate reliably, read there is not enough voltage left at the end of the wires.
Second problem, many of these el-cheapo PoE injectors - which have nothing in common with industry standard PoE - make use of one or two pairs of wires for DC power transport.
There are reasons why industry standard compliant PoE systems operate on higher voltages, requiring two pairs (for 802.11af and at), resp. four pairs on 802.11bt. This is to ensure the cables are not overheating (burning energy due to high cable losses), the specs are tight to keep true industry standard PoE workable so the powered devices can be operated reliably within the specs (especially the voltage) on the longer supported cable runs.
A higher power capable PoE injector would be expensive, require to convert the power source to higher voltage, and regulate it down to the required voltage again after the longer cable. This does neglect the el-cheapo advantage of such a lowest cost system. The only reliable way to deploy PoE is using standards compliant PoE (802.11af), PoE+ (802.11at), or PoE++ (802.11bt), requiring proper standards compliant PoE PSE (power source equipment) and PD (powered devices).
All this has a cost, and can't be replaced by a cheap solution.
It's all in the Ohm's law.
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