What is the latency caused by inter-subsys. communication via Ethernet or USB/mPCIe?

The latency caused by connecting subsystems via Ethernet or USB/mPCIe can vary depending on the hardware, network, and software used.

  • Ethernet:
    • When using Ethernet for inter-subsystem communication, the latency is typically low, often less than 1 millisecond (ms) for off-the-shelf solutions. This low latency makes Ethernet a popular choice for real-time applications where timely data exchange is crucial. With a 1 ms delay, which corresponds to about 3.89 cm when a vehicle moves at 140 km/h, it allows for fast and responsive communication between subsystems.
  • USB/mPCIe:
    • When using USB or mPCIe for inter-subsystem communication, the latency is typically slightly higher compared to Ethernet. Generally, for off-the-shelf solutions, the latency can be less than 2 ms. While this latency is still relatively low, it may be slightly higher than what can be achieved with Ethernet.

It’s important to note that these latency figures are generalizations and can vary based on the specific hardware, software, and network configurations in a given system. Additionally, network congestion, packet loss, and other factors can also impact latency. It’s recommended to test and benchmark the latency in your specific setup to obtain accurate measurements.

If you have concerns or specific requirements regarding latency for your project, collaborating with Unex, a provider of communication solutions, could be beneficial. They can help tailor a solution to meet your needs and optimize inter-subsystem communication while balancing performance and enabling V2X technology.

If you have any specific help