Audio codec is designed for the contribution of audio signals from the studio to transmitter locations. It provides a LAN, an ISDN BRI and an X.21 interface. Two 7kHz connections with different partners can be simultaneously established via ISDN or IP. Complete system operation is possible via the integrated front keypad with display. The intuitive user interface guarantuees a user-friendly operation. It is realised as 19" unit with an integrated power supply.