Network Diode is semiconductor units use fiber optic cabling and special transmitters/receivers tuned to only pass light pulses in one direction. When data comes in, the receiving hardware is configured not to detect or process any incoming signals. On the outbound side, data can be transmitted normally since the transmitting hardware functions independently of any reception capabilit... https://logcla.com/blogs/350114/Network-Diode-What-is-a-Semiconductor-unit-and-How-Does