norway
Verifying network performance: main contractor Nokia Siemens Networks called in the specialist TETRA testing company Syntech Systems for a final check on the network across all TETRA services and terminal types. Using its In-Field Performance Measurement equipment (IFPM), Syntech spent four months on the work, across sites in the Oslo area. Testing and verification are important, Syntech explains, because they provide confidence in advance that the system will deliver when called upon. Over the past two years the company has supplied similar equipment and services to NSN and Motorola to enable them to validate Nødnett’s performance for themselves
“Both this ISI initiative and the fact that we are now
implementing TEDS, I think it will be to the benefit of the TETRA community. We really look forward to this process.”
Educating the decision-makers What experience would the DNK team pass on to other operators planning a new TETRA network? “Tere are a number of, let’s say, high-level learnings”,
begins Mr Lyngstøl. “One of them is that the three public safety agencies are not as similar as we thought they were. I think we handle them now much more independently than we thought was necessary in the beginning. “Maybe another learning is that every country is special.
And then of course it has been very important in this project to have a good contract with the vendor.”
Analysing the benefits M
arianne Storrøsten, a specialist in user psychology, has been involved extensively in evaluation of the network and many aspects of its planning, both within government and now at DNK itself. These evaluations formed part of the case for proceeding to a national deployment. Her work also guides decisions on how to
manage the network during major incidents, events such as the July 22 outrages. “What can we do as an owner of the infrastructure?”, she asks. “Should we be there much more? And when should we come in with repeaters and such things, and also come in and give advice on efficient use of talkgroups? There are so many different settings and ways to use it. “Some things take a lot of capacity, others don’t –
just like when you have teams coming from outside Oslo to help. If they bring a radio with their own talkgroups, they will steal capacity. And especially if you take an Oslo talkgroup out to smaller districts, that will kill the capacity right away. So we can tell how it works and then we can ask the questions. We cannot say that you are not allowed to do it!”
DNK’s user interface expert, Marianne Storrøsten: her work includes benefits analysis for the network itself and for prospective customers
Issue 5 2011 TE TRA TODAY 33
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