Symbol Rate to Data Rate and Back

SR=DR/MF*1/FEC

SR= Symbol Rate
DR=Data Rate
MF=modulation factor = N in the formula (number of phase points = 2^N)
N = 1 BPSK, N=2 QPSKor OQPSK, N=3 8(PSK or QAM), N=4 16(APSK or QAM), N=5 32 APSK, N = 6 for 64APSK or QAM
FEC=Forward Error Correction Rate (need to include inner and outer code)

10 mbps, QPSK rate ½ = 10 msps
10 mbps, QPSK rate 3/4 = 6.667 msps
10 mbps, 8PSK rate 2/3 = 5 msps

For advanced systems you also have to account for any additional overhead. IBS/IDR/custom overhead channels and framing structures for DVB-S2 and ACM support.