The TN series switches use M12 and other circular connectors to ensure tight, robust connections, and guarantee reliable operation against environmental disturbances, such as vibration and shock. The TN-5518A-8PoE series Ethernet switches provide 16 Fast Ethernet M12 ports with 8 IEEE 802.3at/af compliant PoE (Power-over-Ethernet) ports and 2 ports on the down side to provide the Gigabit Ethernet interface with an optional bypass relay function. The EN50155 POE Switch are classified as power source equipment (PSE) and provide up to 30 watts of power per port, and can be used to power IEEE 802.3at/af compliant powered devices (PDs), such as IP cameras, wireless access points, and IP phones. In addition, the 24 to 110 VDC wide power input range and isolated power inputs not only allow you to use the same type of power source at different sites around the globe, but also increase the reliability of your communications system. In addition, the -40 to 75°C operating temperature and IP54-rated waterproof enclosure allow deployment in harsh environments. Moreover, the TN-5500A series is compliant with the mandatory sections of EN 50155, covering operating temperature, power input voltage, surge, ESD and vibration, making the switches suitable for a variety of industrial applications.