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History and future of Ethernet, multimedia apps

Posted: 15 Dec 2008     Print Version  Bookmark and Share

Keywords:audio/video bridging  LLDP  stream reservation protocol 

This article focuses on the details of the three components of audio/video bridging (AVB) and how these components work in unison to enable high-bandwidth multimedia applications.

The audio/video bridging (AVB) system relies on three specifications and also makes use of the existing IEEE 802.1 and 802.3 standards. The first step is establishing the AVB cloud. Streaming services are provided within this cloud and there are latency and jitter constraints. Establishing the AVB cloud utilises the existing 802.1 link layer discovery protocol (LLDP) standard with minor enhancements and 802.3 capabilities. The system then makes use of precise time synchronisation to establish the sync cycle. This sync cycle forms the basis of data sourcing at stream-talkers; bridges use this sync to forward streaming traffic. This sourcing, however, is not enough, as the system could still be oversubscribed (that is, having more traffic sourced than the slowest link could carry), causing excessive delay and jitter. To overcome this potential problem, the stream reservation protocol (SRP) reserves resources required for the stream. This reservation isolates the streaming traffic from bursty TCP traffic and other events in the system.

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