Time aware shaper protocols shape in-vehicle networks
Excelfore adds time aware shaper (TAS) protocols for time sensitive networking (TSN) for automotive use.
To meet automotive requirements for deterministic network behaviour, new protocols must be added to Ethernet stacks to provide audio/video bridging (AVB) and TSN to enable Ethernet to meet the demands of in-vehicle infotainment, control and safety systems.
The Excelfore TAS protocols reside in network talkers and bridges with support for TSN enhancements including IEEE 802.1Qbv and 802.1Qci, explains Excelforce. The TAS provides a circuit-switched/ time-division-multiplexed (TDM) channel into the packet-based Ethernet network. This enables a specific time window to be guaranteed for the delivery of high priority traffic, for example for automotive control systems.
The Excelfore TAS has demonstrated the ability to reduce the variance in measured propagation delays by more than 65 per cent,% compared to Ethernet traffic without the TAS, reports Excelforce. This ensures deterministic sub-100 microsecond accuracy for time-sensitive traffic.
The Excelfore eAVB/TSN protocol stack, including the TAS protocol, is available for Linux, QNX, Integrity and Android operating systems, as well as a variety of smaller real time operating systems (RTOS). It is for use in cameras, video displays, head units, ECUs, and network gateways that bridge to CAN, LIN, and other popular automotive buses.
The TAS protocol will be demonstrated at this week’s Automotive Ethernet Congress (13 to 14 February) in Munich, Germany.
Excelfore provides cloud platform and connectivity applications for intelligent transportation. It provides middleware solutions for smart mobility networks that enable OEMs and suppliers to build the next generation of smart, autonomous and learning vehicles, fleets and associated infrastructure. In addition to the eAVB/TSN protocol stack, it provides the cloud-to-vehicle eSync system for over the air updates, diagnostics and telematics.
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