AES 3-2:2009
AES 3-2:2009 Aes Standard For Digital Audio - Digital Input-output Interfacing - Serial Transmission Format For Two-channel Linearly-represented Digital Audio Data - Part 2: Metadata And Subcode Defines the information transmitted with the audio data: principally the "channel status" but also user data and the use of the auxiliary bits to carry a co-ordination signal.