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The SynqNet option card J14 Aux feedback spec for A quad B digital incremental is 3 MHz line or 12 MHz count.

For the 1 Vp-p analog sin-cos input max recommended Sin-Cos frequency is 625 kHz, although it can be usable up to an absolute max of about 1.5 MHz. 

"Usable" means that there will be specification degradation above 625 kHz and there will also be some sensitivity to potential false trips on signal amplitude.