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Some GS308EP switches do not comply with IEEE 802.3 Ethernet specifications
IEEE 802.3 Ethernet specifications require that the switches provide galvanic isolation between all ports and chassis ground. this means that the POE supply is meant to be "floating" not connecte...
Hello all,
First of all, I'd like to thank everyone for their assistance.
My grounding issue is not due to any fault of the netgear switch. A cheap non-poe device plugged into a different port of the switch in my case ties the power pairs to earth ground of the building causing headaches.
I am a little sad that the non-poe powered ports' potential is able to influence POE ports but I have no clue if this particular issue is covered in the 802.3 standards.
The article you reference, relates to POE++ (802.3bt) however the switch you are testing is not a 802.3bt switch - it is only POE+ 802.3at
Block schematic does essentially not differ between ++ and +
Block schematic does essentially not differ between ++ and +
The way I understand this is that
- the power delivery itself is isolated (per both 802.3at and 802.3bt)
- if you are using shielded ethernet cable, the cable shield should be connected to earth ground at the switch (the power source).
So I think jduzan's test is best made with unshielded cable, unless it is clear how the shield is wired at the PD device.
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