7i90HD MAX Encoder Count Rate?

The 7i90HD manual mentions a medium speed real time interface (around 1 Mbyte/sec) in EPP. However, I'm specifically interested in the maximum encoder count rate. Could someone please provide this information?.

Thank you.
 

The maximum hm2 encoder count rate depends on the sample frequency
At the maximum 7I90HD encoder sample frequency of 100 MHz, the built in 3 clock (filter off)
input digital filter means that a quadrature  input signal must last at least 30 ns to be detected.
This means an approximate maximum count rate of ~60 MHz. Practical
real world signal integrity  considerations limit maximum count rates to about 10 MHz.