Unlocking 25 Gigabit/S on 10 GbE Direct Attach Copper

Re:Unlocking 25 Gigabit/S on 10 GbE Direct Attach Copper by kalleboo on Monday March 23, 2026 @07:53AM (#47488198)

Very cool! Also cool to see inside. It really is directly attached with nothing in between, I honestly wasn't expecting there to be NOTHING in the signal path.

> In a sense, it’s a revolutionary way of how to network — it separates the “what” from the “how”. To be fair: that revolution already happened over 20 years ago

How quickly we have forgotten about AUI (Attachment Unit Interface)

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Re:Unlocking 25 Gigabit/S on 10 GbE Direct Attach Copper by kohlschuetter on Monday March 23, 2026 @08:23AM (#47488470)

Thanks!

AUI: So that's what that port next to the BNC connector on the 3COM 3C509B was for! We've come a long way.

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Re:Unlocking 25 Gigabit/S on 10 GbE Direct Attach Copper by crote on Monday March 23, 2026 @09:22AM (#47489183)

AUI was still very much alive with XAUI[0] during the 10Gbps era!

If you're willing to be a little bit more flexible, the MAC-to-PHY distinction never really went away with the various MII generations: every speed from 10Mbps to 10Gbps is available using more-or-less the same interface.

[0]: https://en.wikipedia.org/wiki/XAUI

[1]: https://en.wikipedia.org/wiki/Media-independent_interface

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