Mitsubishi Electric Network Unit type A7GT-J71LP23/A7GT-J71BR13 is a data link unit designed for use with the A77GOT-S3 Graphic Operation Terminal in MELSECNET/10 optical loop or coaxial bus networks. It allows for communication between the A77GOT-S3 and other devices on the network, enabling data exchange, monitoring, and control functions. With its token ring or token bus communication method, it ensures efficient and reliable data transmission.