Strong SRT 4300 User Manual page 34

Glossary
(11) Packet Identifier (PID)
A set of numbers that identifies transport stream packets containing data from a
single data stream
(12) Polarization
Satellite waves are polarized. They can be linear or circular. Linear polarity is
Vertical or Horizontal, circular polarity is Right-hand and Left-hand circular
polarity.
(13) Quaternary Phase Shift Keying (QPSK)
Phase-shift keying in which four different phase angles are used.
(14) RF
A frequency that is useful for radio transmission, usually between10KHz and
300,000Mhz.
(15) RGB
Video information in the form of Red, Green and Blue tristimulus values, The
combination of three values that representing the intensity of each of the three
colors can represent the entire range of visible light.
(16) STB
Set Top Box, another common name of Digital Satellite Receiver, because it
usually be put on top of TV in household. This word is used now worldwide.
(17) Symbol Rate
The amount of data transmitted every second.
(18) Transponder (TP)
Equipment in a satellite which receives a single uplink channel from a satellite
earth station, amplifies it, converts the frequency and changes the polarization,
then broadcasts it back to earth.
(19) Transport Stream
The bit stream formed prior to transmission of signals by combining the video,
audio and data streams of one service. It consists of fixed length packets of 188
bytes of data.
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