Copper is Faster than Fiber (2017) [pdf]

原始链接: https://www.arista.com/assets/data/pdf/Copper-Faster-Than-Fiber-Brief.pdf

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Hacker News 上的一篇文章讨论了一篇论文，该论文声称在短距离（5米以内）情况下，铜缆比光纤更快。主要原因是光纤涉及额外的信号处理（PHY），这会引入延迟，而直连铜缆 (DAC) 则避免了这种情况。虽然令人惊讶，但在铜缆中的光速也高于光纤，这也有助于延迟差异。然而，这指的是延迟，而不一定是带宽。由于更好的信号完整性和更高的带宽能力，光纤在较长距离上仍然很常见。讨论还涵盖了前向纠错、电缆介电常数以及即使是纳秒级的延迟也至关重要（例如高频交易和高性能计算）的应用。像空芯光纤这样的新技术，其光速接近真空中的光速，可能会改变未来的格局。

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