This is a Studer 8-channel analog line in card with part number A949.0421. It's a great fit for D21m and D23m Modular I/O Systems.

Using this Studer 8-channel analog line in card is easy. First, make sure your D21m or D23m Modular I/O System is turned off. Then, carefully insert the card into the appropriate slot. After that, you can turn on the system and start using it. When it comes to maintenance, keep the card clean and avoid exposing it to extreme temperatures or humidity. If you notice any problems, such as poor signal quality, check the connections first. And always follow the safety instructions provided with your Modular I/O System.