Comtech EF Data SNM-1001L Installation And Operation Manual page 238

SNM-1001L Satellite Modem
Reed-Solomon Codec
The term n - k = 2t is the total number of check bytes appended to the end of the data. The
term's k, n, and t will vary depending on the Reed-Solomon coding used. The Codec then sends
the corrected data to a FIFO.
Because the check bytes are not part of the real data, a synchronous FIFO is used to buffer the
data and strip the check bytes out of the blocks of data. The data then passes through a parallel
converter to be serialized.
The data is sent through a self-synchronizing serial descrambler in accordance with the
INTELSAT-308 Rev. 6B specification. The descrambler converts the data back into the original
data that the user intended to send. The synchronous descrambler is synchronized by the
detection of the unique word at the end of each Reed-Solomon page. The data is then sent to the
interface PCB for further processing.
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