Xilinx VC709 Manual page 24

Other Fixed Frequencies
The fixed frequency bitstreams include:
– 19.440 MHz for OC-48
– 77.760 MHz for OC-48
– 155.520 MHz for OC-48
– 156.250 MHz for 100Gbe/66
– 161.133 MHz for 100Gbe/64
– 166.629 MHz for OTU-1
– 174.703 MHz for OTU-4/64
– 311.040 MHz for OC-48
– 333.257 MHz for OTU-1
– 622.080 MHz for OC-48
– 666.514 MHz for OTU-1
Note: cycling power on the board restores the original 156.25 MHz
programming
Note: Presentation applies to the VC709