Harmonic ProView 2900 - Page 100

Chapter 6: Receiver Configuration Modules Satellite Receiver Configuration
© Harmonic Inc. Manual p/n 101543/Ver 1.0 6-15 ProView 2900 Series/SW Version 1.94
6.2.2.8. PL Scrambling Seed
The Physical Layer (PL) Scrambling feature allows descrambling of the entire physical layer
frame except its header part. The physical level scrambling is done according to a seed
sequence that the user enters. The use of different PL Scrambling sequences allows a
reduction of interference correlation between different services. For the same purpose, it is
possible to reuse a shifted version of the same sequence in different satellite beams.
Furthermore the seed can be associated to a satellite operator or transponder, thus
permitting identification of an interfering signal via the PL Scrambling seed detection.
The PL Scrambling Seed screen allows setting the physical scrambling. The following figure
illustrates the PL Scrambling Seed screen.
PL Scrambling Seed
PL Scrambling Seed PL Scrambling Seed
PL Scrambling Seed
+000000
+000000+000000
+000000
<0
<0 <0
<0 -
--
- +262141>
+262141> +262141>
+262141>
The PL Scrambling seed ranges from 0 to +262141.
6.2.2.9. LNB Power Supply
The ProView 2900 sets the polarization of the receiving antenna by providing different
voltage levels to the satellite Low Noise Block (LNB), 13v for vertical polarization and 18v for
horizontal polarization. The polarization of the receiving antenna is determined according to
the polarity of the satellite transponder.
The following figure illustrates the LBN Power Supply screen.
LNB Power Supply
LNB Power Supply LNB Power Supply
LNB Power Supply
1
11
1

 13V (VERTICAL)
13V (VERTICAL) 13V (VERTICAL)
13V (VERTICAL)
2
22
2

 18V (HORIZONTAL)
18V (HORIZONTAL) 18V (HORIZONTAL)
18V (HORIZONTAL)
3
33
3

 OFF
OFF OFF
OFF
The available options are:
• 13V (VERTICAL) – sets the LNB polarization to vertical.
• 18V (HORIZONTAL) - sets the LNB polarization to horizontal.
• OFF –power to the LNB is disabled.