Satellite Earth Stations and Systems (SES); Satellite User Terminals(SUT) Using Satellites in Geostationary Orbit Operating in the 19@7 GHz to 20@2 GHz (Space-to-Earth) and 29@5 GHz to 30 GHz (Earth-to-Space) Frequency Bands (V1.1.1)
The present document defines the minimum specifications of the technical characteristics of Satellite User Terminals (SUT) operating as part of a satellite network. These SUTs are used mainly for transmission and reception of data signals. In such a network a Network Control Facility (NCF) is responsible for the monitoring and control of the transmit functions of the SUTs. These SUTs have the following characteristics: - reception is in the frequency band allocated to the Fixed Satellite Service (FSS) on a primary basis from 19@7 GHz to 20@2 GHz; - transmission is in the frequency band allocated to FSS on a primary basis from 29@5 GHz to 30@0 GHz; - these SUTs transmit through geostationary satellites with spacing down to 2??way from any other geostationary satellite operating in the same frequency band and covering the same area; - linear or circular polarization is used for transmission or reception; - the received signals may be analogue and/or digital; - transmitted signals are always of digital nature; - the SUT antenna diameter does not exceed 1@8 m@ or equivalent corresponding aperture; - the SUT is designed for unattended operations. The equipment considered in the present document comprises both the outdoor unit@ usually composed of the antenna subsystem and associated upconverter@ power amplifier and Low Noise Block (LNB) downconverter@ and the indoor unit@ usually composed of receive and transmit logic as well as the modulator@ including cables between these two units. The present document applies to the SUT in all its operational conditions@ with its ancillary equipment and its various ports and when operated under the conditions which are within the range of humidity@ temperature@ and supply voltage declared by the manufacturer. All parts of the indoor unit related to reception@ processing and presentation of the received information except the Control Channel (CC) are not within the scope of the present document. The syntax of the CC messages is outside the scope of the present document.