The National Instruments CB-2180 is a Digital Audio Accessory engineered for seamless integration with Digital Video Analyzers and Digital Audio Solutions, specifically designed for use with the PXI-7813R Reconfigurable I/O Module. This accessory features two software-selectable input channels, each equipped with both TOSLINK optical and BNC coaxial connectors, allowing users to connect devices under test (DUTs) utilizing S/PDIF protocols. The integrated LED indicators on each channel provide real-time feedback on input signal lock status, facilitating efficient testing across multiple devices. The CB-2180 supports the acquisition of audio signals encoded in AC-3 or linear PCM formats, making it an invaluable tool in applications involving DVD players, home theater systems, and set-top boxes. Although the CB-2180 has been designated as obsolete, it is still available for purchase and repair through Apex Waves. Comprehensive documentation, including a user manual and maintenance guide, is accessible for download. For pricing inquiries, customers should contact a sales representative directly.