Audio Video Bridging (AVB) is a set of standards developed for IEEE 802.1 Audio Video (AV)-network. Audio Video Bridging (AVB) provide the specifications that will allow time-synchronized low latency streaming services through IEEE 802 networks.

Currently there are four Auido/Video networks defined under IEEE 802.1.

  • IEEE 802.1AS: Timing and Synchronization for Time-Sensitive Applications,
  • 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

History of Audio Video Network Bridging

Historically, connections between Audio/Video equipment have traditionally been analog single-purpose point-to-point one-way signal wire links. Even when the data in the Audio/Video streams transitioned to digital format, the point-to-point one-way link architecture was often reused.

Several years ago, an effort was started within the IEEE 802.3 (Ethernet) working group to define a “residential Ethernet” which would directly address the challenges of Audio/Video streaming. It quickly moved over to the IEEE 802.1 working group to ensure that the technology was scalable from consumer applications (home/auto) to very high professional standards.

Summary of Audio Video Bridging

An “Audio Video Bridging” network is one that implements a set of protocols being developed by the IEEE 802.1 Audio/Video Bridging Task Group. There are four primary differences between the proposed Audio Video Bridging architecture and existing 802 architectures:

  • Precise synchronization,
  • Traffic shaping for media streams,
  • Admission controls, and
  • Identification of non-participating devices.