Both of those high margins are expected, and in the size order they are, because both are sync'ing at the maximum cap for the product. The 3kbps below 80,000 is also normal. I think the lowest I have seen on a "full" 80/20 sync is 79,996Mbps. 79,999 being the highest.
The margin above 6dB would be used if the line were allowed to sync at the Max/Attainable rate - 111.343Mbps on the XyXel and 103.792Mbps on the HG612.
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Edited by RobertoS (Thu 24-Nov-16 13:37:03)