M500 FEC Modes
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There has been an increasing number of FEC codecs released and used in the last few years. The table below represents the current state of FECs available for the PSM-500 series of modems and shows which options, code rates and modulation modes are applicable to each. More are in development now. A PDF version of this table is available here.

PSM-500 Series FEC Option Table    Ver. 1.6       Modem Firmware 0.71+
FEC Type Sel # FEC Type Option Sel # Code Rates Available Sel # R-S Option Modulation Modes (see notes)
and Selection #
              BPSK
0		 QPSK
1		 OQPSK
2		 8PSK
3		 8QAM
4		 16APSK
5		 16QAM
6
None 0 N/A 0 N/A 0          
                           
Viterbi 1  Normal 0 1/2 0      
        3/4 1      
        5/6 2      
        7/8 3      
     Swap C0/C1 1 1/2 0      
        3/4 1      
        5/6 2      
        7/8 3      
   CT 2 3/4 1 u            
      7/8 2 u            
                           
TCM 2     2/3 0            
                           
TPC 4  Advanced 0

 0.453-16k

 0      
        1/2-16k 1      
      1/2-4k 2