The 6777 audio adapter board is a USB audio I/O assembly consisting of a USB audio connector board and an I/O plate with speaker, MIC and line-in audio connections. The audio connector board is ideal for 2U chassis designs and board hardware such as the Trenton TQ9 and BPG6741 backplane. The audio interface connector on the 6777 audio adapter board can connect to audio signals from P9 on the Trenton TQ9 system host board or to audio signals from P30 on the Trenton BPG6741 backplane. To use the audio interface of the BPG6741 you must install a Trenton SBC such as the TQ9 that supports backplane USB ports to the BPG6741.