Comtech EF Data CDM-425 Installation And Operation Manual page 570

1
1E-1
Uncoded
BPSK/QPSK
1E-2
Rate
0.642
8-QAM
1E-3
1E-4
1E-5
1E-6
1E-7
1E-8
1E-9
1
BER
Figure B-4. VersaFEC Codec Rates 0.642, 0.711, and 0.780 8-QAM
Appendix B
2 3 4
Rate Rate
0.711 0.780
8-QAM 8-QAM
2 3 4
5 6 7
Comtech VersaFEC® Codec
Rate 0.642, 0.711, 0.780
8-QAM
Typical performance show -
guaranteed performance curves
are 0.3 dB to the right
5 6 7
B–8
CDM-425 Advanced Satellite Modem
Eb/No in dB
8 9 10 11
Uncoded
8-PSK
8 9 10 11
MN-CDM-425
Revision 0
12
12