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P
LP : (Physical Layer Pipe) from 1 to 256 channels are available in DVB-T2 to transport inde-
pendent multiplexes.
P
OLARIZATION: Polarization of a signal from the satellite. It can be either:
linearly polarized, horizontally or vertically:
Circularly polarized to the right or the left
In ground reception, the polarization is generally horizontal (the stalks of antennas are horizon-
tal). Some receptions in band VHF are in vertical polarization (Canal+). In this case, the stalks of
the antenna are vertical.
P
OSITIONER: A motorized system for the rotation of a satellite dish. Positioners are operated
by DiSEqC commands
Q
: Quadrature Amplitude Modulation.
AM
This kind of modulation is used for digital transmissions (cable networks and DTT).
Q
PSK: Quadrature Phase Shift Keying (or 4PSK)
A kind of modulation mostly used for satellites.
8
: A type of modulation identical to QPSK, but with an 8-possibility (3-bit) coding. This kind
PSK
of modulation enables
higher rates than QPSK and is compatible with DVB-S2.
R
EED-S
: An algorithm used to correct errors in digital transmissions
OLOMON
S
: Any norm that defines the characteristics of a modulation.
TANDARD
Analogical standards: L, BG, DK, etc.
Digital standards:
QAM for cable television
QPSK, 8PSK for satellite television
COFDM for terrestrial digital television
7849B – 7859B – 7817B
p.
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