# \#phy

**URL:** https://forums.digi.com/tag/phy/1997.md

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## [Connectcore 6UL and ethernet phy issue](https://forums.digi.com/t/connectcore-6ul-and-ethernet-phy-issue/20593)

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**Author:** [@ghermant](https://forums.digi.com/u/ghermant)\
**Replies:** 0\
**Last updated:** [June 27, 2019, 8:10am UTC](https://forums.digi.com/t/connectcore-6ul-and-ethernet-phy-issue/20593 "2019-06-27T08:10:58Z")

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Hi All, I’m facing a problem with ethernet interfaces. My custom board is populated with KSZ8081RNB (Rev id 1) ethernet phy. At startup the ethernet interface are working well. But if i run ifconfig ethX down followe…

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## [Auto MDI-X difficulties with CC9P9215](https://forums.digi.com/t/auto-mdi-x-difficulties-with-cc9p9215/14492)

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**Author:** [@kay](https://forums.digi.com/u/kay)\
**Replies:** 1\
**Last updated:** [March 6, 2015, 5:37pm UTC](https://forums.digi.com/t/auto-mdi-x-difficulties-with-cc9p9215/14492 "2015-03-06T17:37:03Z")

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We have been using the CC9P9125 for years now always thinking it would perform Auto MDI-X on the Eth interface. Now a customer complains about it so we started testing. It seems it doesn’t work at all. We needed to use a…