Could you explain how works the signal quality estimation and how we can use the value from the Mean Square Error A Register (Address: 0x8402) in real application?
The ADIN1200 PHY provides a measure of the signal quality of the established link. This relates directly to the signal to noise seen by the PHY receiver. When the link is up, the signal quality on each pair is indicated in the mean square error register MSE A. MSE register values in the range of 3 to 5 are expected into a cable length up to 100 m, and indicate a good link.
As the cable length gets longer and external noise increases, the MSE reported will increase.
To calculate the associated signal-to-noise ratio (SNR) during idle, apply the following formula to the MSE value read:
- SNR (dB) = 10 × Log10(MSE/1024)
An SNR value > 21dB (MSE of 8 or 9) indicates essentially error-free performance. At 18 or 19dB (MSE of 13 or 14) occasional errors may be observed over a 24hr period.
Hope that helps.