SYS stands for single yarn strength.
CN/0.9807 = SYS
SYS X 1.6934 X actual count / 1000 x 156.2 = CLSP
If you want to convert this CLSP into RKM please divide it by 156.2
CN is yarn strength in centinewton.
Hope this short calculation for Converting CN to CLSP/RKM was helpful for you.