PLS - Physical Layer Scrambling

January 23, 2014.

Physical Layer Scrambling or PLS is used in DVB-S2 as a way to improve data integrity. A number called the “scrambling sequence index” is used by the modulator as a master key to generate the uplink signal. This same number must be known by the receiver so that demodulation is possible.

Most satellite transponders use PLS 0 as a default value but there are some transponders that use other values.

Unidentified DVB-S2 satellite transponder
Unidentified DVB-S2 satellite transponder
 
 
We press F2 and enter the corresponding PLS sequence number
We press F2 and enter
the corresponding PLS
sequence number

Decoding PLS encrypted transponders

Field strength meter RANGERNeo 2 is compatible with this type of signals. The PLS sequence number can be entered under F2 as shown in the picture below.

After entering the PLS sequence number, the satellite transponder has been locked
After entering the PLS
sequence number, the satellite
transponder has been locked
Now the instrument is able to decode the picture and audio
Now the instrument is able to decode
the picture and audio