Issue
While Continuum controllers and EcoStruxure controllers do not utilize Power over Ethernet (POE), can plugging in a Continuum or EcoStruxure controller into a POE switch damage either the POE port or the controller?
Product Line
Andover Continuum, EcoStruxure Building Operation
Environment
- PoE
- Ethernet
Cause
Controllers must be installed on a subnet served by a POE switch.
Resolution
- According to the IEEE standard, a POE switch shall determine if the connected device is POE capable before turning on the power.
- The detection if a connected unit is POE capable is done by measuring the resistance between the pair #2 - #3 and pairs #1 - #4.
- On a POE capable unit the resistance is 25kohm, with some tolerance. If it is lower or higher it is not considered to be POE capable.
- As there are no Continuum or EcoStruxure ethernet controllers that apply a 25K ohm load, a properly functioning switch port will not enable PoE power and the device will not be damaged.
Information on the PoE standard can be found in the following document.
