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Quick FEC and Feature Matrix

There has been an increasing number of FEC codecs, modulation types, and interfaces released and used in the last few years. The table below represents the current state of features 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. Click here for a PDF version of the FEC Modes table.

Quick Guide


PSM-500 Series FEC and Feature Matrix


Viterbi, TCM TPC & LDPC FEC Matrix


PSM-500, 500L, 500LT Models FEC Option Table  Rev 1.8   Modem Firmware V 0.77+
FEC Type Sel # FEC Type Option Sel # Code Rates Available Sel # R-S Option Modulation Modes (see notes) & Sel #
              BPSK     0 QPSK    1 OQPSK    2 8PSK    3 8QAM  4 Future  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 •♦             •
        7/8 2 •♦             •
               
TCM 2   0 2/3 0 •       •      
               
TPC 4  Advanced 0 0.453-16k 0   • • •   •   •
        1/2-16k 1   • • •   •   •
        1/2-4k 2   • • •   •   •
        3/4-16k 3   • • • • •   •
        3/4-4k 4   • • • • •   •
        7/8-16k 5   • • • • •   •
        7/8-4k 6   • • • • •   •
        0.922-16k 7   • • • • •   •
        0.950-4k 8   • • • • •   •
     M5 Full 1 1/2 0   • •          
        *TPC4k Only   3/4 1   • •          
        7/8 2   • •          
     M5 Short 2                    
        3/4 1   • •          
        *TPC4k Only   7/8 2   • •          
     M5 Legacy 3                    
        3/4 1   • •          
        7/8 2   • •          
     CT 4 5/16 0   •            
        21/44 1   • • •        
        3/4 2   • • • •     •
        *TPC16k only   7/8 3   • • • •     •
        0.95 4   • • • •     •
               
LDPC 5 Block Sizes 0 1/2 0   • • • • •   •
    256 to 16k     2/3 1   • • • • •   •
    available   3/4 2   • • • • •   •
    at all   14/17 3   • • • • •   •
    Code Rates     7/8 4   • • • • •   •
         10/11 5   • • • • •   •
         16/17 6   • • • • •   •
               
S-Tec 6 Any 0 1/2 0   • • • •     •
    Interleaver     3/5 1   • • • •     •
    Block Size   3/4 2   • • • •     •
    Option 0~4   4/5 3   • • • •     •
          5/6 4   • • • •     •


Notes:
  1. The TPC M5 Full, Short and Legacy modes are PSM-4900 Compatible
  2. * TPC 4k/16k restrictions apply to that line and Code Rate only.
  3. TPC16k operates up to 20 Mbps depending on Feature Set and modulation.
  4. The Viterbi, Rate 3/4 & 7/8, 16QAM CT mode only for Comtech modem compatibility as they only operate in this mode with R-S at 220, 200, depth of 4. R-S is auto-enabled.
  5. TPC Advanced modes are Datum Systems proprietary implementations that require the TPC16k option only for the colored lines. They offer superior performance to CT modes.
  6. TPC4k Max data rate limits see below.
    • TPC4k M5 Mode Limits: Rate 1/2 = 2.46 Mbps, Rate 3/4 or 7/8 = 4.92 Mbps.
    • TPC4k CT Mode Limits: Rate 5/16 = 2.048 Mbps, 21/44 = 3.2 Mbps, 3/4 = 5 Mbps, 0.95 = 6.6 Mbps.
  7. LDPC-16k Block Sizes are 256, 512, 1k, 2k, 4k, 8k and 16k bits up to 29.52 Mbps.
  8. LDPC-2k Block Sizes are 256, 512, 1k, 2k bits, limited to approx. 3 Mbps.




PSM-500 Feature Matrix

PSM-500 Series IF Interface Versions.
Interface Versions PSM-500S PSM-500N PSM-500L PSM-500LT
IF Transmit 50 ~ 90 MHz 100 ~ 180 MHz 950 ~ 1750 MHz 950 ~ 1750 MHz
IF Receive 50 ~ 90 MHz 100 ~ 180 MHz 950 ~ 1900 MHz 950 ~ 1900 MHz
PSM-500 Series Feature Matrix.
  Original M5 PSM-500S/N/L/LT Series
Features PSM-4900 M505 M511 M523
Modulation        
  BPSK • • • •
  QPSK • • • •
  OQPSK N/A • • •
  8PSK/8QAM/TCM N/A Upgrade • •
  16QAM N/A Upgrade Upgrade •
Max Data Rate        
  BPSK 2.46 Mbps 2.5 Mbps 5 Mbps 7.38 Mbps
  QPSK/OQPSK 4.92 Mbps 5 Mbps 10 Mbps 14.76 Mbps
  8PSK/8QAM/TCM N/A N/A 10 Mbps 29.52 Mbps
  16QAM N/A N/A N/A 29.52 Mbps
FEC Modes        
  Disabled N/A • • •
  Viterbi • • • •
  Reed-Solomon Option • • •
  TPC - 4K Option Option Option Option
  TPC - 16K N/A Option Option Option
  LDPC N/A Option Option Option
IBS Mux/AUPC Option • • •
SnIP Ethernet Int. Option Option Option Option
HSSI Interface N/A Option Option Option