There are two main reasons why scrambling is used: To enable accurate timing recovery on receiver equipment without resorting to redundant line coding.

What is the purpose of scrambling?

The function of the scrambling is to remove long string of ones (1s) and zeros (0s) from the digital binary data. Scrambler is used in physical layer transmitter where as descrambler is used at receiver. The scrambling does not increase or decrease the bit rate i.e. the input and output bits are same in size.

What is scrambling and why it is useful?

Scrambling is a digital encoding technique that is used in modern data communication schemes and can principally provide aid in retrieving information from received data enhancing synchronization between the transmitter and the receiver. ... Scramblers are used in a variation of applications.