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400G Optics in 2025: The Practical Backbone for AI Training, Cloud Scale, and Cost-Efficient DCI
400G Ethernet

400G Optics in 2025: The Practical Backbone for AI Training, Cloud Scale, and Cost-Efficient DCI

Nishu Sharma

As 400G infrastructure hits critical mass, selecting the right optical transceivers is crucial for AI and cloud success. This comprehensive guide details the trade-offs between QSFP-DD and OSFP, provides a complete cabling distance matrix (SR8 to 400ZR), and offers a TCO analysis to help architects build efficient, high-density networks.

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