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Feature Descriptions MDM6000 Satellite Modem
14.6.8 Physical Layer Scrambler Signature
MDM6000 >> Modulator >> PL Scrambler Signature
The following information about the Physical Scrambler Signature is taken from the
DVB-S2 standard. Refer to the following document, ETSI EN 302 307.
In case of broadcasting services, the PL Scrambler Signature = 0 shall be used as default sequence,
this to avoid manual receiver setting or synchronization delays.
The PL Scrambler Signature, assuming values in the range 0 to 262 141, indicates the spreading
sequence number. 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 PL Scrambler Signature can be
unequivocally associated to each satellite operator, satellite, or transponder, thus permitting
identification of an interfering signal via the PL Scrambling "signature" detection. There is no explicit
signaling method to convey the PL Scrambling signature value to the receiver.
14.6.9 LNB Power Supply
MDM6000 >> Demodulator >> LNB Power Supply
The MDM6000 Satellite Modem provides the possibility to add a DC power and frequency band
selection signals compatible with most professional and commercial LNBs.
• 13V/0kHz;
• 13V/22kHz;
• 18V/0kHz;
• 18V/22kHz.
If LNB power is enabled, devices that do not tolerate a DC-voltage at their input can
be damaged (e.g. non-Newtec outdoor units, spectrum analyzers).In this case it is
advised to use a DC-block at the input of the device.
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