Audio / video bridging
| AVB | |
|---|---|
Audio Video Bridging (AVB) refers to a series of standards of the Audio / Video Bridging Task Group ( IEEE 802.1 ) for synchronized and prioritized streaming of audio and video data over networks. The AVB Task Group renamed itself the Time-Sensitive Networking (TSN) Task Group in November 2012 as part of an expansion of its field of work . The TSN Task Group is also working on enhancements to the mechanisms defined in AVB.
AVB consists of the following standards:
- IEEE 802.1AS: Timing and Synchronization for Time-Sensitive Applications (gPTP),
- IEEE 802.1Qat: Stream Reservation Protocol (SRP),
- IEEE 802.1Qav: Forwarding and Queuing for Time-Sensitive Streams, and
- IEEE 802.1BA: Audio Video Bridging Systems
IEEE 802.1Qat and IEEE 802.1Qav extend the established IEEE 802.1Q standard , which describes prioritization and virtual LAN . Both extensions were integrated in IEEE 802.1Q-2011.
Historical background
The cabling of classic A / V devices was mainly done as a point-to-point connection due to the analog signals . In the case of large installations, this quickly leads to a number of individual connections that is difficult to keep track of. Digitized content is also often implemented as a point-to-point connection. Among other things, AVB makes it possible to use inexpensive and comprehensive Ethernet networks for the duplex transmission of numerous audio and video channels. Several network connections are synchronized using time information that is also transmitted.
Current status
| default | status | date |
|---|---|---|
| IEEE 802.1Qav | Ratified and published | Jan. 5, 2010 |
| IEEE 802.1Qat | Ratified and published | Sep 30 2010 |
| IEEE 802.1AS | Ratified and published | March 30, 2011 |
| IEEE 802.1BA | Ratified and published | Sep 30 2011 |