This is a Studer AES/EBU card with 16-channel input and 16-channel output, suitable for the D21m Modular I/O System. The Studer part number is A949.0424.

To use this Studer AES/EBU card, first make sure your D21m Modular I/O System is powered off. Then, carefully insert the card into the appropriate slot in the system. After that, power on the system. When using, keep the environment dry and avoid strong vibrations. For maintenance, regularly check the card for any signs of damage. If there are dust accumulations, use a soft brush to gently clean the card. If you encounter any problems, contact Studer's customer service.