Chp_7 forward error correction (fec), Introduction, Chapter 7. forward error correction (fec) – Comtech EF Data SNM-1001L User Manual

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7–1

Chapter 7. FORWARD ERROR

CORRECTION (FEC)

7.1

Introduction

The SNM-1001L 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 SNM-1001L 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.