4x AES/EBU Input/Output BNC module offers 4 balanced AES inputs, with Input Sample Rate Converters (SRC), as well as 4 AES balanced outputs. It has relay bypass for pairs of I/Os and relay wait time after power up. The C8189 does not have front panel controls. It may be configured via a DIP switch and a rotary encoder. On the front panel there are two LEDs with different display modes.