starsat SR-999USB, Руководство пользователя

Страница: 40 / 40

-40-
 Forward Error Correction(FEC)

A system of error control for data transmission.
 PID(Packet Identifier) 
A set of numbers that identifies transport stream packets containing data from a
single data stream.
 Polarization

Polarization allows several programmers to be fit into the same frequency band.
The signals from a satellite are transmitted either with linear (vertical or
horizontal) polarization or circular (right or left) polarization.
 QPSK(Quaternary Phase Shift Keying)

Phase-shift keying in which four different phase angles are used.
 Transponder

An automatic device that receives, amplifies and retransmits a signal on a
different frequency.
 Symbol rate

Speed of the digital transmission
 Scrambled TV programmer

Some TV programmers are transmitted in scrambled form.
 SERIAL RS 232

A serial communication standard data port.