In this flyaway package shown by Benjamin Wilms, of the German distributor Selectric, is a complete TETRA network in a box. It is built around a deployable TETRA system in a 19-inch rack module, from Damm. The rack holds a two-carrier TetraFlex base station and controller unit, plus an IP router and telephone/ data interfacing capable of full duplex communication. On its own stand nearby, Damm showed its indoor TetraFlex base station, which is now available for up to 16 radio carriers. Potential users of this of this rapid-deployment communication equipment include military units posted to remote territories and humanitarian organizations involved in emergency disaster relief missions around the world
and software-based tools, applications and interfacing device for TETRA installations. Among these was a voice-over-IP server which interfaces the TETRA system to the IP world and vice versa , acting as a TETRA media gateway to a LAN. Certain analogue radio models can be connected to it too. “Te information that we get from these devices, we transfer into the IP, and on the other side we are catching all information with our dispatcher, our hardware or software clients”, explained Ivan Kosko, at a rack of equipment. “Te most simple one is an IP radio speaker which can get only information from one radio – it has only one PTT, one microphone, one speaker. Ten the more complicated one is an IP console unit. “With this console you can switch between the radios which currently you want to control.... So you can navigate and control the radio as if you were sitting directly on it. “Te most sophisticated is an IP dispatcher
unit. To it you can connect many more accessories.... You can switch the display between the radios. You can have up to
Connecting with the network G
erman mobile data specialist Hagedorn Informationssysteme showed a variety of hardware
TETRA interfacing and control: a demonstration system shown by the German developer Hagedorn Informationssysteme
four PTTs. Ten you can have two separate streams, so you can have mixed groups in one speaker and in [the other], for instance, individual calls.” Supporting the hardware are the company’s desktop dispatcher applications. “Te most simple one is a virtual radio which is connected to the one radio”, Mr Kosko continued. “You are getting the voice and data, as if you are behind the radio. Ten we have, more complicated, the virtual console. You can have at the same time up to eight devices so you can directly decide over which device you want to speak. You just press PTT and speak.”
in May at the TETRA World Congress in Dubai – but in the meantime it was showing its GPSy indoor positioning system, which relies on fixed radio beacons, and its NeTIS TETRA base station range. “We have a large success because of
the design and of the capability of this equipment and now we deliver a lot”, said Pierre Minot, president of Etelm, speaking of the base station. “We are improving the capabilities of it. We have been working a lot with multi-slot packet data because multi-slot packet data is difficult when you want to optimize.
Issue 6 2012 TE TRA TODAY
Making the most of multi-slot data when network loading is heavy F
rench infrastructure developer Etelm is working on new equipment to introduce
“What is important in multi-slot packet
data is to provide intensive tests with a lot of traffic, because most of the problems with this technology are when the traffic increases near to the overload point. And so now we are supplying a function which is proved with a lot of traffic. We have spent a lot of time, three months of tests, with simulations and real-time tests, to be sure of this solution without any blocking effects.”
Tuned for four-slot data: Pierre Minot of Etelm, with the NeTIS-BOX TETRA base station, the company’s latest TETRA technology in a fully portable, rugged enclosure. It can be used in a stand-alone mode or connected to a network
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