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Not anymore for all practical purposes, but it once did for the very old 10Base-2 standard for Ethernet over coaxial cable. This is practically why the old MII Ethernet PHY interface protocol had the collision-sense lines to indicate to the MAC to stop sending data if it detects incoming data, in attempts to minimize collisions.

https://en.wikipedia.org/wiki/10BASE2

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This is very cool history, and something I never would have stumbled upon myself. Thank you for sharing! :-)