Advanced Video Processing and Networking
6.9.2 HD-SDI Input
The VCM can receive four groups of audio streams embedded in the HD serial
digital interface (HD-SDI) feed. Each group contains two channel pairs. Hence the
HD-SDI feed can carry up to a maximum of 2 x 4 = 8 pairs, or 16 mono channels.
Each group has an associated Data Identifier (DID). The DIDs are set to the SMPTE
299M defaults for audio group 1 to group 4:
• Group 1 = 0x2E7
• Group 2 = 0x1E6
• Group 3 = 0x1E5
• Group 4 = 0x2E4
The DIDs are located in ancillary packets in the data stream. They are fixed at the
SMPTE 299M defaults.
6.9.3 SDI Input
The VCM can receive four groups of audio streams embedded in the serial digital
interface (SDI) feed. Each group contains two channel pairs. Hence the SDI feed
can carry up to a maximum of 2 x 4 = 8 pairs, or 16 mono channels.
Each group has an associated Data Identifier (DID). The DIDs are set to the SMPTE
272M defaults for audio group 1 to group 4:
• Group 1 = 0x2FF
• Group 2 = 0x1FD
• Group 3 = 0x1FB
• Group 4 = 0x2F9
The DIDs are located in ancillary packets in the data stream. They are fixed at the
SMPTE 272M defaults. DID 1F4 is reserved for EDH error packets. Refer to the
SMPTE 272M specification for more details.
6.9.4 Digital Input
The digital input of the VCM accepts four EBU/AES-3 streams that can carry
uncompressed or compressed audio. Digital input is provided by the 15-pin D-Sub
connector located on the backplane of the VCM.
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