norway
ISI is going to happen. The first roaming agreements were set up between Norway and Sweden for GSM. Now you will see the first ISI along this border. So we will push this
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we should have TEDS base stations and where we should not”, Mr Lyngstøl says. “You might say that ideally we should have it everywhere. Maybe we’ll end up with that; I don’t know. But what we will do is we will make good TEDS coverage where we build it. We want the users to have a good user experience. Tat is the principle we follow everywhere.”
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Inter-System Interface Besides pioneering TEDS, DNK has placed itself in the forefront with another innovation in TETRA systems – ISI, the Inter-System Interface. Tis long-awaited development will enable TETRA radio systems to be linked
in a standardized way, so that (for example) agencies using neighbouring TETRA networks can intercommunicate and roam seamlessly on to each other’s system, making use of at least a basic set of TETRA service features and functions. Mr Lyngstøl comments: “It is very hard to explain to
politicians in Norway and Sweden – where the parliaments of both countries have allocated money for heavy investments in public safety digital radio systems – it’s very hard to explain to them why can’t we cross-communicate. “Tis is an issue that I really don’t understand, that ISI
hasn’t moved forward faster. But now it is going to happen. We have allocated finances for it on our side and the Swedes have done the same on their side.” For both countries, the need for ISI arises mainly from their
long shared border, although the border forces will have to wait until 2015 to make use of this new facility. It will involve interconnecting TETRA networks from
different infrastructure manufacturers: Norway’s network is by Motorola, but Sweden’s is from Cassidian. “Along the border, the first responders are very co-operative”, Mr Lyngstøl says. “Tey need this tool. But now ISI is going to happen. Te first roaming agreements were set up between Norway and Sweden for GSM. Now you will see the first ISI along this border. So we will push this.
Calling out Norway’s volunteer firefighters A
TETRA development which has been pioneered in Norway is a function known as callout.
“You send an alarm message out, typically to volunteer firefighters who are not based in any fire station”, explains Dagfinn Sjøvik, project manager for Nødnett. “So we are replacing the pager functionality of today. “With this functionality, they will be able to not
only get the beep in their phone but also get their voice message, and they can reply back, ‘I’m coming’ or ‘I’m not coming’. And of course that, on the control room side, enables a better utilization of the resources. They know who is coming, who is bringing what gear and stuff like that. This is implemented in ordinary radios and it has also been through the TETRA specification process.” It’s expected that the volunteers would much
prefer to carry a small TETRA pager which has a long battery life, in place of a bulkier radio – although, as a pocket device without an external antenna, a TETRA pager might lack sensitivity. “We always get a question about, ‘Is the coverage good enough?’ ”, responds Tor Helge Lyngstøl, director of DNK. “But we have some special planning for this. We have a stronger field strength in the distance up to 5km from all the fire stations for these voluntary firefighters. They will be within that range.” Conveniently, most houses in the Norwegian
countryside are made of wood, which is more transparent to radio signals than most other building materials.
32 Firefighter at an incident in Norway TE TRA TODAY Issue 5 2011
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