Nexor Data Diode is a hardware device that provides physically enforced, unidirectional data transfer between networks. The device uses optical or electrical connections with one half physically terminated inside a sealed, tamper-evident enclosure, ensuring data can only flow in one direction with no possibility of reverse communication. The device operates without IP addresses or management interfaces, making it invisible on the network and immune to remote exploitation. It uses a light-emitting diode and receiver to guarantee one-way data flow, with no return path that could be used for data exfiltration or command-and-control attacks. Nexor Data Diode is designed for environments requiring assured separation between trusted and untrusted networks, including critical infrastructure, military operations, government agencies, and industrial control systems. The device supports 1 Gbps and 10 Gbps transfer rates while maintaining wire-speed performance. The product is independently evaluated to Common Criteria EAL7+ and designed to meet NCSC and NATO assurance standards. It is manufactured in the UK and the Netherlands through partnerships with certified suppliers. The sealed hardware construction prevents configuration drift and eliminates patch management requirements, providing maintenance-free operation throughout its lifecycle. Applications include secure integration of legacy systems in rail networks, evidence integrity and archiving for government agencies, critical infrastructure monitoring for OT-to-IT data transfer, and military intelligence operations requiring secure data dissemination between classified and coalition networks.