A hardware-enforced data diode and unidirectional network security appliance designed to provide physical isolation between networks of differing security classifications, such as IT and OT environments. The appliance utilizes a non-routable, non-networked serial or optical connection to guarantee one-way data flow from high-security to low-security zones. This true protocol break strips out all network routing information, ensuring that malicious traffic, command-and-control communications, and network-borne threats cannot traverse back into the protected environment. The architecture allows organizations to continuously stream real-time operational technology telemetry, files, and video to external IT networks without exposing critical infrastructure to cyberattacks.
The appliance acts as a deterministic isolation device, dropping all TCP/IP handshakes, ARP, and BGP routing requests to fully separate connected domains. Built for industrial environments, it features scalable throughput, high-availability active/standby configurations, and redundant power supplies. Some deployments incorporate specialized bilateral mechanisms specifically engineered to handle the mandatory return traffic required by SQL databases and industrial historians without compromising the underlying physical isolation. Deployments typically reside at the perimeter of industrial control systems, SCADA environments, nuclear facilities, and classified networks where strict cross-domain security and regulatory compliance are required.
