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Explore the evolution from passive to active cable backplane architectures in AI systems through this 18-minute conference talk from the Open Compute Project. Learn how increasing numbers of accelerators in scale-up domains and higher protocol frequencies in PCIe, Ethernet, and UALink are challenging traditional passive cable backplanes that connect GPUs and XPUs with fabric switches. Discover the collaborative solution developed by Astera Labs and TE Connectivity that integrates signal conditioning devices directly into cable backplane cartridges to address these emerging challenges. Examine the specific trends driving architectural changes in AI rack designs, understand the technical limitations of passive systems, and analyze the implementation details of active cable backplane solutions. Gain insights into the mechanical, thermal, and signal integrity tradeoffs involved in this technological transition, with practical demonstrations available at exhibitor booths to showcase the functional capabilities of this innovative approach.
