The power over ethernet standard defines two methods for the use of an Ethernet transmission cable for direct current transmission to a POE compatible device: an Mid -Span and End-Span.
Intermediate crossing method (Mid -Span). Use of idle line pairs that are not used in Ethernet cables to transmit direct current. The utility model can be used to supply power to the network terminal equipment through the network cable, and the Midspan PSE is a special power management device, which is usually put together with a outdoor poe switch.
It is used to transmit the data on the core line at the same time the transmission of DC power, its transmission and Ethernet data signal with different frequency.
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