TECHNICAL SESSION This paper describes the challenges that implementing Infotainment Systems using AVB pose to system and endpoint developers. We discuss real-life deployment examples, including considerations in system startup, network topology, and endpoint design.
Ethernet AVB delivers many advantages, but it also comes with challenges that both hardware and software teams must consider. The standards provide Quality of Service (QoS) for AV streams by guaranteeing isochronous transmission, low latency (802.1Qav), accurate clock synchronization (802.1as), and data-rate control (802.1Qat). The real-time processing requirements of these network protocols are challenging for processors, MCUs, and software stacks. The trend towards highly responsive, deterministic Ethernet networks is seen to result in higher interrupt loads and requires changes to conventional methods for handling network interfaces.
We consider the example of IEEE 1722. An AVB Endpoint must send/receive IEEE 1722 packets at a very high frequency: 8000 class A packets per second per stream. This high rate minimizes latency in the network, but it requires the endpoint to handle a high real-time processing load.
The experiences we describe in Ethernet AVB Head Unit and Amplifier development are an important proof point that AVB in the car is now a reality and delivering the expected advantages