116 Inputs and Outputs: Two 18PIN terminal for GPIO interfaces, supporting 16 inputs and 16 outputs. Can ensure the safety of existing structured wiring while ensuring the normal operation of the existing net, providing efficiency and cost savings. 2Optocoupler Isolation Function: Optocoupler isolation circuit, so that there is no direct electrical connection between the two parts of the circuit being isolated, to prevent interference caused by having an electrical connection, especially between the low voltage control circuit and the external high voltage circuit. 3POE Technology: POE refers to the technology that can provide DC power supply for some IP based terminals while transmitting data signals without any changes to the existing for Ethernet Cat.5 cabling infrastructure. 4Fanless and Noiseless: The whole machine is designed without fans, and the all aluminum housing with heat dissipation teeth dissipates heat more effectively, and it is also dustproof, shockproof and anti electromagnetic interference. 5Support 4 Ways: 5 for Intel Gigabit net ports, support 4 way 802.3af standard POE net ports. Each machine is subject to more than 24h strict high temperature aging test before leaving the factory to ensure that each machine is qualified.