Editing Satellite modem (section)

=== Scrambling ===
{{Main|Scrambler (randomizer)}}
[[Scrambler (randomizer)|Scrambling]] is a technique used to randomize a data stream to eliminate long '0'-only and '1'-only sequences and to assure energy dispersal. Long '0'-only and '1'-only sequences create difficulties for timing recovery circuit. Scramblers and descramblers are usually based on [[linear-feedback shift register]]s.

A scrambler randomizes the transmitted data stream. A descrambler restores the original stream from the scrambled one.

Scrambling shouldn't be confused with encryption, since it doesn't protect information from intruders.