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Forum Discussion
Solved
PoE Voltage 802.3af and PoE+ Voltage 802.3at
It has come to our attention that some NETGEAR Community users want to learn more about the PoE standard and offerings.
Class 1 PoE Voltage 802.3af
Standard Class 1 PoE Voltage (also k...
We need to make this very clear that Netgear is primarily* supporting "intelligent" IEEE standard PoE types (802.3af, PoE+ 802.3at, and PoE++ 802.3bt).
This means there is no power applied, there is nothing to measure on the switch port on the PSE side.
If people read "24V PoE" or "48 V PoE" in product descriptions of PD (powered devices) or power injectors we can be almost certain this is _not_ intelligent IEEE standard PoE, but much more legacy (proprietry) passive power over Ethernet cable.
On the industry standard IEEE PoE, there is typically no discussion or mentioning of voltage at all. Just like for Ethernet transport over copper, also IEEE PoE does make use standardized voltages (lightly variable as part of the versions and classes). IEEE PoE interoperation is granted permitting the PSE (power source equipment) does fulfill the power requirement of the PD (powered device) and confirm this as part of the negotiation - this will allow the PSE to apply power, and the PD to receive power and operate reliably.
This industry standard design does also ensure non-PoE Ethernet equipment is never at risk.
*As of writing, the only non-IEEE PoE compliant device in Netgear offerings is the WBC502 AirBridge, which does implement a passive 24V variant (for both the injector and the device obviously).
We need to make this very clear that Netgear is primarily* supporting "intelligent" IEEE standard PoE types (802.3af, PoE+ 802.3at, and PoE++ 802.3bt).
This means there is no power applied, there is nothing to measure on the switch port on the PSE side.
If people read "24V PoE" or "48 V PoE" in product descriptions of PD (powered devices) or power injectors we can be almost certain this is _not_ intelligent IEEE standard PoE, but much more legacy (proprietry) passive power over Ethernet cable.
On the industry standard IEEE PoE, there is typically no discussion or mentioning of voltage at all. Just like for Ethernet transport over copper, also IEEE PoE does make use standardized voltages (lightly variable as part of the versions and classes). IEEE PoE interoperation is granted permitting the PSE (power source equipment) does fulfill the power requirement of the PD (powered device) and confirm this as part of the negotiation - this will allow the PSE to apply power, and the PD to receive power and operate reliably.
This industry standard design does also ensure non-PoE Ethernet equipment is never at risk.
*As of writing, the only non-IEEE PoE compliant device in Netgear offerings is the WBC502 AirBridge, which does implement a passive 24V variant (for both the injector and the device obviously).
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