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  PoE and LED Lighting: t...  
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A midspan PSE is a power injector that resides between a normal Ethernet switch and the PD, and it injects power within the network cabling without affecting the data. Being able to install PSEs in midspan and endspan configurations supports legacy networks and offers more control over which network segments are powered.
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In a PoE midspan insertion implementation, the PSE uses pairs 4-5 and 7-8 for power distribution. Power is distributed directly through the unused pairs in a midspan configuration for 10/100Mbps Ethernet (Figure 1). The positive PSE output (V+) is connected to wires 4 and 5, while the negative PSE output (V-) is connected to wires 7 and 8. In this configuration, the power pairs are separated from the original signal pairs, which pass through the PoE midspan power injector. The midspan power injector is useful in installations where there is already an Internet connection and it is too expensive to change out or upgrade the Internet switch/router to provide PoE.
  PoE and LED Lighting: t...  
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All PDs include a 25kΩ resistor across powered pairs to allow the PSE to detect when a PD connects and disconnects from the network. To support legacy installations, newer PSEs must be able to properly power PDs on both cat 3 and cat 5 cabling.
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Powering and controlling LED lights over a PoE network creates the opportunity to use the LED lights in new and novel ways. For example, with appropriate battery backup or emergency power generation that is already part of the network installation; PoE-based LED lighting can be instantly repurposed and used to provide important lighting during a power outage without the need for a specialized, secondary lighting system. The LED lighting can be used for more than just emergency lighting. It can also be used to communicate important and possibly dynamically changing information to building occupants, such as to show the safe exit paths out of the building, or indicate areas of the building to avoid if the LED lighting can be commanded to change color by an LED controller already installed in the PoE network.