Specifications

7–1
CHAPTER 7. FEC AND TURBO
7.1 Introduction
The SDM-300L3 is equipped with several Forward Error Correction (FEC) encoders and
decoders:
• Viterbi
• Sequential
• Reed-Solomon (Concatenated per Intelsat)
• Reed-Solomon (Concatenated per Closed Network)
• Trellis (FAST option)
• Turbo Codec
• Uncoded
The constraint lengths and encoding polynomials are not only Open Network compatible, but
also are Closed Network compatible with the vast majority of existing modems.
THE SDM-300L3 can be fitted with a Turbo Product Codec. Turbo Product Coding is small
SIMM module that can be fitted to the unit at time of manufacturing.