Power over ethernet devices, systems and methods

An interface system comprising:

• at least one operational device;
• an interface device for interfacing the at least one operational device to Ethernet Power Source Equipment PSE, the interface device comprising:
• a network connection jack for connection to the PSE;
• a first output jack for providing an Ethernet power and data connection for an external device;
• a second output jack for providing a DC power connection for an external device;
• a power extractor circuit operatively connected to the network connection jack, for providing a signature to the PSE and receiving a power signal from the PSE, the power extractor circuit providing a predefined output signal in response to receiving a power signal from the PSE;
• and
• at least one delay element arranged to electrically connect the network connection jack and the first output jack, after a predefined delay from a time at which the power extractor circuit provides the output signal.

An method for interfacing one or more external devices to Ethernet Power Source Equipment PSE, the method comprising:

• connecting a network connection jack to the PSE;
• providing a first output jack for Ethernet power and data to an external device;
• providing a second output jack for DC power to an external device;
• connecting a power extractor circuit to the network connection jack;
• providing a signature from the power extractor circuit to the PSE and receiving a power signal from the PSE, through the network connection jack;
• providing a predefined output signal from the power extractor circuit in response to receiving a power signal from the PSE;
• and
• electrically connecting the network connection jack to the first output jack, after a predefined delay from a time at which the power extractor circuit provides the predefined output signal.