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the user has to connect the PC via IP/ethernet to the DVI-100 that is registered to a base station in the TETRA infrastructure. T is allows a PC user remote from the TETRA network to intercommunicate with a group within the TETRA infrastructure, either to just listen or even participate in group calls. An iPhone application is available, as well as Java-based software for Mac or Windows computers. T is solution has been in use in a utility
company where one of the managers lives outside the coverage area of the TETRA network but still needs to be reachable at any time though the TETRA infrastructure. Using this setup, it possible for the manager to control, communicate or just listen to the group conversations.
Back up solution T e DVI-100 could also be used as a ‘worst case’ backup if the E1 or IP link between the TETRA switch and the base station fails. If, for any reason, the link becomes lost, communication between the control centre and the lost site can be restored via an IP connection directed to a DVI-100 which is registered to the base station that has lost the link and is operating in fallback mode. In addition to the direct connection via
IP or ethernet, the DVI-100 can be reached from outside the TETRA infrastructure via GSM/3G. In this case, a member of a group who has GSM/3G coverage can connect from anywhere in the world and can interact with the groups through a mobile device. T e mobile device establishes an IP connection an IP router which is in turn connected directly to a DVI-100 in a TETRA infrastructure. T us the DVI-100 is able to interconnect two diff erent digital networks – in this case, a GSM network and a TETRA infrastructure. Again, the voice signal is never turned into
analogue signals at any time, but remains digital from end to end. Software used on the mobile device uses an ACELP codec to convert the voice into the high-quality TETRA voice
Issue 7 2012 TE TRA TODAY
standard even before leaving the device. T us the voice quality will not suff er as a result of passing through the GSM network.
MicroSPOT T is confi guration can be used to create a local TETRA access point (MicroSPOT) which operates in DMO (Direct Mode, a back-to-back connection between two radio devices). T e DVI-100 in DMO mode is connected
by an IP connection to another DVI-100 in server mode, which is attached to a TETRA network. All TETRA terminals operating in DMO and within range of the DVI-100 MicroSPOT can access the confi gured group(s) of the trunked TETRA network by voice, SDS and status communication. Example applications for the MicroSPOT
are improving in-house coverage or covering white spots inside a TETRA network. By using a reliable mobile IP link (3G or LTE), mobile forces can use the TETRA network even in unserved areas.
University development In a collaboration between Funk-Electronic Piciorgros and the Communication Networks Institute (CNI) of the Technical University of Dortmund University, the partners have enhanced the PTX (Push To Talk) protocol developed at the CNI for the transmission of voice, status and SDS messages. T is licence-free protocol can be
implemented on an interface device (PC, smart-phone, tablet, Mac) or directly into a TETRA switch. In this way, an Inter System Interface (ISI) for voice and data based on groups can be implemented easily. Professor Christian Wietfeld, head of the
institute, commented: “We use the DVI-100 for our research about critical communications in heterogeneous network environments. With the help of the DVI-100, we could show migration paths from state-of-the-art TETRA networks to next generation public safety communication systems.
“T is research was made possible because the
DVI-100 enables us the use of a new and unique packet format. We were enabled to couple TETRA with Wi-Fi, 3G, 4G (LTE) and satellite networks. “Our research interests are new protocols for a
convergence layer for PMR communication via heterogeneous networks.” Having achieved the ability to interconnect
the DVI-100 with a GSM/3G network, Funk-Electronic Piciorgros is only a step away from also connecting the DVI-100 to an LTE infrastructure. As soon as the fi rst LTE smartphones are available, Funk-Electronic Piciorgros will implement the ACELP codec on these devices so that they may be used to interface between TETRA and LTE infrastructures.
A commitment to TETRA Funk-Electronic Piciorgros is committed to providing service to customers employing the TETRA standard. T is commitment can be found in the interoperability, user-friendliness, ingenuity and security of the company’s solutions.
E
stablished for more
than 25 years, Funk-Electronik Piciorgros has specialized in the development and manufacturing of SCADA, telemetry and telecommand systems, building particular strengths in utilities, gas and oil as well as in water industry automation. Its focus is mainly TETRA solutions for the automation industry.
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