The 4E-FPI and 4E-RPI L-Net power injectors provides additional power injection point to the L-NET (Local Network bus of Infinitus Voice Evacuation System), where an auxiliary DC power supply may be connected. Thanks to the L-net power injector, more L-Net devices with relatively high power consumption (such as touchscreen paging microphones) can be installed on the same CAT5e cable, devices can be installed in larger distances from the central equipment and further away from each other.