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DP83TD510E-EVM: how DP83TD510E-EVM judges if the link is establishing or not?

Part Number: DP83TD510E-EVM
Other Parts Discussed in Thread: DP83TD510E

Hi Team, 

My customer wants to know how DP83TD510E-EVM judges if the link is establishing or not. 

Now customer uses MSE(mentioned in this material) to check the link quality of cable with DP83TD510E-EVM

However, even if the MSE is a good value (-28dB. when transfer it to hexadecimal number, 00CF → the link quality is good), the link may be suddenly broken.

On the other hand, even if the MSE is a bad value, the link can still working sometimes. 

Thanks.

Regards,

Jo