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News
Keeping Austria Safe
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30 Nov 2006
ATDI and RSI are supporting Tetron by supplying a vital tool to the country’s emergency services communication network.
Austria’s new emergency services radio network is a private finance initiative being built by Tetron, jointly owned by Motorola and Alcatel. Once the network had been installed and commissioned, the contract required Tetron to demonstrate that the network actually provided the specified level of service.
To carry out this verification process, Tetron bought the Gemini tool from ATDI. ATDI engineer Peter Paul comments: “Gemini provides high-level, objective measures of radio network performance that can be compared against a Service Level Agreement (SLA) or other agreed performance criteria. In difficult terrain like Tyrol, Gemini was particularly effective at measuring the performance as perceived by users and was able to correctly determine where there were problems from multi-path propagation caused by the mountains”
Gemini automatically places and receives calls, each call using speech samples on the up-link and down-link. Gemini then logs the call and grades the speech received, along with other information such as serving site. The received speech is given a Mean Opinion Score (MOS); MOS provides a numerical measure of the quality of speech at the destination end of the circuit and gives a reliable and repeatable way of measuring the network performance.
The Gemini testing of the radio network was done using German speech samples and the Motorola MTM800 TETRA terminal to help ensure that the results closely matched the experience of the end-users.
Ghana radio network planning & survey project completed
17 Jan 2005
RSI have completed a significant radio network planning contract for W Lucy & Co Ltd as part of major international project to improve the electricity distribution network efficiency in Ghana. The overall aim of the project is to reduce electricity losses of the Electricity Company of Ghana (ECG) distribution network, improving overall efficiency, minimizing customer outages and reducing operational and maintenance costs. The areas covered included the capital Accra, Tokuse (a rural area near to Accra) and the remote Bogoso area with poor access and dense jungle.
RSI's responsibility was to propose, design and specify a radio network to link all of the remote switching points back to a central control using UHF point-to-point telemetry links. This was a significant challenge given the remoteness of many of the locations, some of them requiring links over 60km. The inital planning phase was only possible by using satellite imaged terrain data to produce radio coverage predictions.
The second phase was then to carry out coverage surveys on site in Ghana to prove that the links would work in practice. The surveys were successfully completed on time despite the basic conditions with roads often proving almost impassable. The results of the survey were then analysed and a final system design confirmed that included a number of remote repeater sites to achieve the links to all 26 electricity switch locations.
Click for W Lucy Case Study for this project
Gemini now compatible with Motorola, Sepura & Cleartone TETRA terminals
20 Sep 2004
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