Description
The FA10AO-4 Audio Diode is a hardware security device that enforces unidirectional analog audio flow between a host and an audio peripheral. It is designed to prevent reverse-channel audio capture and mitigate risks of eavesdropping and covert data exfiltration through speakers or headsets. The unit is NIAP Common Criteria PP4.0 PSD certified, providing an evaluated protection profile for peripheral devices.
Key features include one-way audio enforcement, an integrated low-pass filter, and a mechanical control for disabling access when required. The diode prevents a speaker or headphone from being used as a microphone by ensuring audio travels only from the host to the audio device. The low-pass filter restricts audio frequencies to the human-audible range to block ultrasonic or high-frequency injection attacks.
Technically, the FA10AO-4 is an analog-to-analog audio diode configured Always Open and without microphone support. It connects inline between a PC analog output and an analog audio device, maintaining unidirectional signal flow while preserving audio quality within the audible band. The device operates within 0°C to 40°C and stores within -20°C to 60°C, making it suitable for standard office and secure-room environments.
Connectivity is straightforward – standard analog host output to analog audio device cabling is used, and the device presents a compact desktop footprint. The form factor measures 85 mm x 65 mm x 34 mm and the unit is lightweight for simple deployment. No drivers are required and operation is immediate after inline connection, with push-button controls for temporarily disabling audio access.
Common applications include secure conference rooms, classified workstations, and government or corporate facilities where audio leakage is a concern. The diode is appropriate wherever enforcing hardware-level one-way audio is required to protect sensitive conversations or to eliminate audio-based side-channel threats. It is suitable for integration into existing AV setups without altering host software or OS audio configurations.
Installation is plug-and-play and the build is compact for desktop placement or cable-run mounting near a workstation. The FA10AO-4 is designed for reliability in continuous operation and benefits from NIAP PP4.0 certification which supports procurement in regulated environments. For organizations requiring hardware-enforced audio directionality and certified assurance, this unit provides a pragmatic security control without complex configuration.