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Comtech EF Data Vipersat Load Utility v3.5.x User Manual

Page 83

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Chapter 4 - Using VLoad — Digicast Mode

4-13

Digicast Media Router Remote Commander

• Symbol Rate (kbps) – The symbol rate will depend on the configured

mode of operation. The following combinations support the following

symbol rates.

• Modulation – The Media Receiver supports the following modes of

operation:
• DVB-S – QPSK
• DVB-S2 – QPSK
• DVB-S2 – 8PSK
Each mode of operation provides a range of FEC rates that are supported

based on the mode and modulation. The FEC rates can be selected

through the software. The chosen setting must match on both the

modulator and demodulator.

• Polarization – The configured polarity provides the voltage supplied to

the LNB or switch. Select 13VDC for vertical polarization or 18VDC for

horizontal polarization. The Media Receiver is capable of providing

500mA of current in either setting. It is recommended, that if the LNB

voltage is not required, to install a DC block.

• Spectral Inversion – There are four supported modes of spectral

inversion:
On – forces the tuner to stay with spectral inversion. The tuner will not

check for spectral inversion automatically.
Off – forces the tuner to stay without spectral inversion. The tuner will not

check for spectral inversion automatically.
On Both – tries spectral inversion first and then attempts to automatically

check spectral inversion periodically.
Off Both – tries non-spectral inversion first and then attempts to

automatically check spectral inversion periodically.

Digital Video

Broadcast

Phase Shift Key

Msps

DVB-S

QPSK

2 – 45 Msps

DVB-S2

QPSK

6 – 32 Msps

DVB-S2

8PSK

6 – 32 Msps