Page 1 - GCI

Communications tower at primary seismic station PS43 at Keskin, Turkey.

With monitoring data and analysis reports at its core, the global alarm system designed by the Comprehensive Nuclear-Test-Ban Treaty (CTBT) depends on a well functioning communication system for the timely, reliable and accurate transmission of data and data bulletins. The Global Communications Infrastructure (GCI) was developed to meet this expectation.

The GCI is a communication system of truly global character. It connects places distributed all over the globe with the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) in Vienna and all CTBT States Signatories.

The Global Communication Infrastructure (GCI) was developed to provide a functioning communication system for the timely, reliable and accurate transmission of data and data bulletins.
Communications equipment at radionuclide station RN47, Kaitaia, New Zealand.

The GCI was designed to ensure data transmission from the 337 facilities of the International Monitoring System (IMS) in near-real time to the International Data Centre (IDC) in Vienna where data are processed and analysed.  The GCI is also used to distribute the raw data from IMS stations as well as IDC data bulletins to Member States. This very detailed information enables Member States to assume their rights and responsibilities under the CTBT.

The GCI is the first global satellite communications network based on Very Small Aperture Terminal (VSAT) technology comprising an earth stations, a dish antenna and a PC interface.

Satellite based technology

The GCI is the first global satellite communications network based on Very Small Aperture Terminal (VSAT) technology. A VSAT is a set-up on the ground called earth station that allows for communication via a satellite. It employs a dish antenna to send and receive signals, and an interface to a PC.