OTNetGuard is a passive and fail-safe network tap that provides secure, out-of-band monitoring of Industrial Control Systems (ICS). It captures analog, serial, and IP communications while supporting protocols like MODBUS, DNP3, and IEC-101 through modular data capture platforms. The device includes optional secure wireless backhaul capabilities for remote locations and Zero Trust Network Architectures. It integrates with SIEM, SOAR, and GRC platforms to deliver analytics, deep packet inspection, and alerting functionalities. Through encrypted communication and secure data transmission, it detects anomalies and identifies threats in real-time to enhance operational and cybersecurity strategies.