The JetNet 3908G-M12 is a new generation Powerover-Ethernet Switch with rugged M12 connectors. It is designed for IP Surveillance in harsh environments such as Train, MRT, and LRV systems and is equipped with 8 PoE/PSE Gigabit interface. The PSE system enables 30W high power PoE function and is compliance with IEEE 802.3af/at standard. The switch system adapts to vehicle/railway electrical power system and supports several types of input voltage rating to correspond with different train electrical power systems. With multi-backup features, the JetNet 3908G-M12 is capable to construct IP Surveillance network on the train, ensure passenger's safety and improve train network reliability.