802.1AS defines a Precision Timing Protocol based on the IEEE 1558v2 protocol. It allows every device connected to the network to share a common global clock. The protocol allows devices to have a synchronized view of this clock to within microseconds of each other, aiding media stream clock recovery to phase align audio clocks.

The IEEE 802.1AS-2011 standard document is available to download free of charge via the IEEE Get Program.

802.1Qav defines a standard for buffering and forwarding of traffic through the network using particular flow control algorithms. It gives predictable latency control on media streams flowing through the network.

The XMOS AVB solution implements the requirements for endpoints defined by 802.1Qav. This is done by traffic flow control in the transmit arbiter of the Ethernet MAC component.

The 802.1Qav specification is available as a section in the IEEE 802.1Q-2011 standard document and is available to download free of charge via the IEEE Get Program.

802.1Qat defines a stream reservation protocol that provides end-to-end reservation of bandwidth across an AVB network.

The 802.1Qat specification is available as a section in the IEEE 802.1Q-2011 standard document.

IEC 61883-6 defines an audio data format that is contained in IEEE 1722 streams. The XMOS AVB solution uses IEC 61883-6 to convey audio sample streams.

The IEC 61883-6:2005 standard document is available for purchase from the IEC website.

IEEE 1722 defines an encapsulation protocol to transport audio streams over Ethernet. It is complementary to the AVB standards and in particular allows timestamping of a stream based on the 802.1AS global clock.

The XMOS AVB solution handles both transmission and receipt of audio streams using IEEE 1722. In addition it can use the 802.1AS timestamps to accurately recover the audio master clock from an input stream.

The IEEE 1722-2011 standard document is available for purchase from the IEEE website.

IEEE 1722.1 is a system control protocol, used for device discovery, connection management and enumeration and control of parameters exposed by the AVB endpoints.

The IEEE 1722.1-2013 standard document is available for purchase from the IEEE website.