# MII connection checks between a NS9210 and a PHY

**URL:** <https://forums.digi.com/t/mii-connection-checks-between-a-ns9210-and-a-phy/4410>\
**Category:** NET+OS\
**Tags:** netos\
**Created:** [December 19, 2012, 2:25pm UTC](https://forums.digi.com/t/mii-connection-checks-between-a-ns9210-and-a-phy/4410 "2012-12-19T14:25:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ltu](https://avatars.discourse-cdn.com/v4/letter/l/f08c70/32.png) [@ltu](https://forums.digi.com/u/ltu)\
**Post date:** [December 19, 2012, 2:25pm UTC](https://forums.digi.com/t/mii-connection-checks-between-a-ns9210-and-a-phy/4410/1 "2012-12-19T14:25:40Z")

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Hi,  
I would like to check if the the MII connection between my NS9120 and an Ethernet switch (A Micrel KSZ8873) is accurate.  
Is there a means for that ?  
I found the MII Management Indicators Register in the datasheet. It features a MIILF (MII link failure) bit, but documentation is weak :

When set to 1, indicates that the PHY currently has a link fail condition.

Does anybody have more information?  
regards