Comtech EF Data CDM-IP 300L - Manual (Page 301)

CDM-IP 300L IP-Centric Satellite Modem Rev. 1
CD/CDMIP300L.IOM
275
9 Forward Error Correction Options
9.1 I
NTRODUCTION
The CDM-IP 300L 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 CDM-IP 300L 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.
9.2 C
ODING
The CDM-IP 300L can have any of the following configurations:
Basic CDM-IP 300L (Sequential or Viterbi Decoder
FAST options (Sequential or Viterbi Decoder)
FAST options with Reed-Solomon hardware (Sequential or Viterbi Decoder)\
Turbo hardware.
9.3 T
URBO
P
RODUCT
C
ODEC
(H
ARDWARE
O
PTION
)
9.3.1 I
NTRODUCTION
Comtech EF Data implements the FEC Codec based on TPC. A Turbo Product Code is a
two dimensional array of block codes. Encoding is relatively straightforward, but
decoding is a very complex process requiring multiple iterations of processing for
maximum performance to be achieved.