# change MII speed

**URL:** <https://forums.digi.com/t/change-mii-speed/5111>\
**Category:** NET+OS\
**Created:** [July 6, 2005, 12:42pm UTC](https://forums.digi.com/t/change-mii-speed/5111 "2005-07-06T12:42:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![olafw](https://avatars.discourse-cdn.com/v4/letter/o/919ad9/32.png) [@olafw](https://forums.digi.com/u/olafw)\
**Post date:** [July 6, 2005, 12:42pm UTC](https://forums.digi.com/t/change-mii-speed/5111/1 "2005-07-06T12:42:06Z")

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Hi,I tried using customizeMiiSetSpeed() in my app to change from autodetect to 10 mbit / half duplex and failed miserably. Any thoughts ? Regards Olaf

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**Author:** ![Jesper](https://avatars.discourse-cdn.com/v4/letter/j/49beb7/32.png) [@Jesper](https://forums.digi.com/u/Jesper)\
**Post date:** [July 8, 2005, 10:18am UTC](https://forums.digi.com/t/change-mii-speed/5111/2 "2005-07-08T10:18:51Z")

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What do you mean when you say that it “failed miserably”. What happenes? Doesn’t the PHY change to 10mbit/half duplex?

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**Author:** ![olafw](https://avatars.discourse-cdn.com/v4/letter/o/919ad9/32.png) [@olafw](https://forums.digi.com/u/olafw)\
**Post date:** [July 8, 2005, 11:17am UTC](https://forums.digi.com/t/change-mii-speed/5111/3 "2005-07-08T11:17:47Z")

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Exactly, the PHY does not change to 10 mbit/half when I call customizeMiiSetSpeed(FALSE, FALSE); in my app. I am using a standard Intel 971 PHY.