IEEE Ethernet AVB (Audio/Video
MIDI and AVB
For the past several years, the IEEE 802.1 Working Group, which develops
Ethernet networking standards, has been developing a set of services for
low-latency audio and video transport. The objective is known as Audio/Video
Bridging (AVB) and provides precision time synchronization and stream bandwidth
reservation at the network level.
The AVB services provide the foundation for time-sensitive
delivery of data by the network, but do not specify the means for interoperable
communication of the data by applications. The IEEE-1722 AVB Transport Protocol
(AVBTP) and IEEE-1733 L3 Transport Protocol specifications define how data is
carried ("payloads") on AVB networks.
IEEE-1722 supports IEEE-1394/IEC-61883 (FireWire) format
data (audio, video, and MIDI), which is popular in consumer and professional A/V
devices, and allows bridging between FireWire and Ethernet networks. IEEE-1722
also includes definitions for other payload types, including "MMA
Payloads" which are defined by MMA, rather than by IEEE, and
here in the near future.
IEEE-1733 defines the means to transport MIDI using IETF's
Realtime Transport Protocol (RTP) -- including RTP-MIDI -- with the improved timing services of AVB.