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Satelite Video Glasses
the functional modules, which are necessary to the net head for the emission from data, as well as station software, in order to steer it. So that all receivers have the opportunity to Satelite Video Glasses send data to the master station becomes the frequency band, which is assigned directed to the upward (generally found between 5 and 65 MHz) into channels on divides which time situations receivers by the master station is dynamically assigned. Management of communication with the master station demands a highly developed tax software, which admits as MAC is (means seize back control), which more important operational funds (processing output, LIGHTNING and RAM memory size) as a receiver without reciprocal effect required. Three main standards exist today for bi-directional communication over cables: • The DOCSIS standard, developing of the United States, is mainly intended for cable modem, permitting high-speed entrance to the Internet, but, box can be also used in an interacting digital Fernsehapparatc$einstellenoberseite. Upward directed the customs modulation QPSK or 16-QAM in the low VHF band (5 to 42 MHz). Interacting data use native Internet Protocol (IP) also with variable. The channels of the use 6MHz with 64, directed downstream - or 256-QAM and ITU-J83 appendix B FEC. It can be in principle everywhere set in UHF/CVHF volume (70 to 860 MHz). The original standard (DOCSIS 1,0) was improved to DOCSIS 1,1 on behalf to the Servicequalität (QoS) guarantees required by voice over IP telephony. • Euro DOCSIS is a variant, which is adapted to the European the 8 MHz channels and frequency allocation. Satelite Video Glasses Directed the downstream agrees with DVB-C Spezifikt. (Appendix 429/ITU-J83 A FEC ETS-300). The use modulation QPSK or 16-QAM in the low VHF band, directed upward, extended that to 65 MHz essentially the back getting channel increases capacity over DOCSIS 1.x. 40 65 MHz) one changes over, or to a new COFDM demodulator (since only 2001 products) that directly appropriate accepts IF signals at 36.15MHz at their entrance and in such a way avoids an additional transformation stage. ADC the COFDM signal, changed over or not, one applies to an analog-digital converter with a resolution of 9 or 10 bits and digitized with a sampling rate on behalf of 20MHz (undersampling, if it is IF signal with 36,15 MHz). COFDM demodulation this block is the main element of the demodulation process. I and q-those signals are manufactured dependent on digitized again, IF signal and the OFDM signal are demodulated by Satelite Video Glasses means of a fast Fourier transform (FFT) in the points 2K or 8K, on the mode (number of the hoisting engines) of the received signal. 157]] >
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Satelite Video Glasses
