#interconnects

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A QSFP-DD optical transceiver seated in an open test cage on a signal-integrity bench, a high-speed probe tip caught just above its test point with a sampling oscilloscope glowing softly out of focus behind it

How AI Datacenter Interconnects Actually Work

Underneath every all-reduce sits a queue pair, a doorbell register, a PAM4 laser and a switch buffer that is either draining or filling. This is the mechanism, one layer down from the equipment.

By Brecht Corbeel · September 30, 2026 · 19 min read

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