ETSI - EN 301 359
Satellite Earth Stations and Systems (SES); Satellite Interactive Terminals (SIT) Using Satellites in Geostationary Orbit Operating in the 11 GHz to 12 GHz (Space-to-Earth) and 29,5 GHz to 30,0 GHz (Earth-to-Space) Frequency Bands
| Organization: | ETSI |
| Publication Date: | 1 January 1999 |
| Status: | inactive |
| Page Count: | 41 |
scope:
The present document defines the minimum specifications of the technical characteristics of Satellite Interactive Terminals (SIT) operating as part of a satellite network. These SITs are used for reception of audio-visual signals as well as data and for providing a return channel for interactive services via satellite.
In such a network a Network Control Facility (NCF) is responsible for the monitoring and control of the transmit functions of the SITs. These SITs have the following characteristics:
- reception is in the Fixed Satellite Service (FSS) frequency ranges from 10,70 GHz to 11,70 GHz and from 12,50 GHz to 12,75 GHz as well as the Broadcast Satellite Service (BSS) frequency range from 11,70 GHz to 12,50 GHz;
- transmission is in the frequency band allocated to FSS on a primary basis from 29,5 GHz to 30,0 GHz;
- these SITs transmit through geostationary satellites with spacing down to 2° away 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 SIT antenna diameter does not exceed 1,8 m, or equivalent corresponding aperture;
- the SIT 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 SIT 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 are not within the scope of the present document. The syntax of the control channel messages is outside the scope of the present document.
NOTE: Typically the received signal will be a digitally modulated signal as defined in EN 300 421 [2].
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