The IEEE 802.1DG™ standard defines a Time-Sensitive Networking (TSN) profile for automotive in-vehicle networks, ensuring deterministic, low-latency, and highly reliable communications over standard Ethernet.
Standard IEEE 802.3™ Ethernet has proven to be an efficient and cost-effective networking technology for decades. Its success is driven by economies of scale and depth of expertise across a broad, multi-industry networking community. Since inception, Ethernet has continuously evolved to meet the needs of a wide range of application areas.
As part of the evolution, IEEE 802.1™ Time-Sensitive Networking (TSN) was introduced to support time- and/or mission-critical applications. TSN extends the usability of Ethernet networks into domains such as automotive, aerospace, industrial automation, and professional audio/video. In addition to the base standards specifying the technology, TSN profile specifications have been introduced to simplify interoperability, deployment, and TSN use within specific application areas. IEEE 802.1DG is a profile specification targeting automotive applications.
Accurate timing and guaranteed data delivery are critical requirements in automotive environments. Solutions such as IEEE 1588™-based protocols (e.g., IEEE 802.1AS™) can provide timing accuracy in the sub-microsecond range. Such accuracy will be required as Ethernet usage expands within the vehicle. In addition, other IEEE and TSN standards provide secure, ultra-reliable, and bounded low-latency communications throughout the vehicle at multiple data rates.
At the same time, the in-vehicle wiring harness presents significant challenges with regard to weight and space, coupled with higher throughput requirements for automotive Electronic Control Units (ECUs) and sensors. To address these constraints, various PHYs targeting automotive are available today, including single twisted-pair 10 Mb/s (IEEE 802.3cg™), 100 Mb/s (IEEE 802.3bw™), 1 Gb/s (IEEE 802.3bp™), and 2.5/5/10 Gb/s (IEEE 802.3ch™).
The new standard, IEEE 802.1DG-2025 “IEEE Standard for Local and Metropolitan Area Networks—Time-Sensitive Networking Profile for Automotive In-Vehicle Ethernet Communications,” is the first available IEEE standard developed to specify the use of TSN over IEEE 802.3 Ethernet for automotive in-vehicle networks.
IEEE 802.1DG specifies profiles for bounded latency in-vehicle communications based on IEEE 802.3 Ethernet and IEEE 802.1 TSN standards. IEEE 802.1DG brings together existing IEEE 802.1 TSN standards into a unified framework to support scalable, interoperable, and cost-efficient automotive network architectures based on standard Ethernet. The new standard provides information and guidance to automotive vendors and suppliers designing vehicular systems that require bounded latency in automotive in-vehicle networks. It also addresses the use of features from IEEE 802.1 standards to meet the bandwidth, latency, and synchronization needs for communications within automotive vehicles.
Because IEEE 802.1 standards are intentionally broad and applicable across many environments, IEEE 802.1DG determines the features from IEEE 802.1 standards that are directly applicable to automotive in-vehicle networks and suggests how these features are used, including recommendations about how to configure optional parameters. “IEEE 802.1DG is a key step forward to use standard Ethernet networks in the automotive industry,” said Glenn Parsons, chair, IEEE 802.1 Working Group. “This work facilitates the adoption of standard Ethernet bridged network in vehicles to address industry demand on developments toward autonomous and software-defined vehicles.”
IEEE 802.1DG is available for purchase at the IEEE Standards Store and at IEEE Xplore.
