What Is InfiniBand XDR?_
InfiniBand XDR (Extreme Data Rate) is the latest signaling rate in the InfiniBand roadmap, offering 200 Gbps per lane. It is used in high-performance computing and AI clusters to interconnect GPUs and storage at very low latency. XDR is backward compatible with prior generations through link negotiation.
Technical Details
XDR uses PAM-4 signaling to achieve 200 Gbps per lane, typically deployed in multi-lane form factors such as OSFP or QSFP-DD, supporting lane counts up to 8 per port. The physical layer requires high-quality optical transceivers and low-loss fiber cabling to maintain signal integrity at these speeds. XDR links are commonly used for scale-out GPU networking (e.g., InfiniBand fabric) separate from the NVLink copper spine inside the rack. Cable lengths are limited by the relevant standard and OEM specifications for the specific transceiver type.
How Leviathan Systems Works with InfiniBand XDR
In our field deployments, XDR optics and cables are installed in the top-of-rack switches and GPU nodes for the scale-out fabric, requiring careful fiber routing and cleaning to avoid signal degradation. We verify link training and error rates during commissioning to ensure the fabric meets performance targets.
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