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 (...abbreviated)