| Will PoE kill a non-PoE device? |
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| August 2008 | |
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A PoE compliant PSE will not kill a non-PoE device. This is because the PSE will check the receiving end for PoE compliance before supplying power. A compliant PoE powered device at the receiving end has a PoE Signature Resistor for identification. If a device at the receiving end does not have a PoE Signature Resistor, the PSE will not supply power to it. The checking voltage for Signature Resistor is only 2.8V initially. It is small enough not to kill a networking device. For example, most laptops if not all as of August 2008 are not PoE compliant. When we connect such a laptop to a PSE, nothing will happen other than a waste of time. |