tetra
‘Consumer’ networks are developed for maximum profit, not maximum resilience; they cannot offer the levels of availability required by mission and business-critical deployments.
A living standard Over €10 billion has been invested by users to date on installed TETRA networks and terminals, and the technology remains a ‘living’ standard, continuing its development and evolution through the work of ETSI and the TETRA Association. Available for users looking for one site, or for
governments deploying a nationwide public safety network, TETRA offers true interoperability achieved through a strict, independent and tightly controlled process. Tis gives users the benefit of economies of scale as well as choice, with over 40 terminal models currently available, as well as a wide choice of infrastructure vendors. Ultimately, the decision is taken by the customer, and
that’s as it should be. PMR users have never had so much choice or functionality on offer – and TETRA provides the safest choice. Te TETRA Association will continue to work with
TETRA digital radios and accessories are available for many specialized purposes too – for example, covert applicationsfor police and security forces
its increasing member base to safeguard competition, innovation and interoperability, and to ensure that users have access to all the information they need with which to make a considered choice of communications service.
system together with emergency alarms linked to Tetra radios. Te aim of the Norra Länken project is to reduce the volume of traffic and noise pollution from the roads surrounding the Swedish capital by diverting traffic through new tunnels under the city. Te safety system, from Identec Solutions and
Zonith, uses RFID tags to monitor employees entering tunnel sections. In this way, safety staff can monitor how many people are in a section at any time. “With our RFID access control system linked
to the alarm and communication system, we’re always aware of the safety level in the tunnels”, said Roger Zell, security manager at Norra Länken. “Instant emergency alarm information is
Making a tunnel site safer for its workers I
n the construction of a road tunnel project in Stockholm, workers’ safety underground has been buttressed by an RFID access control
key to us. With this solution, we automatically get updates in clear text on our radios and can react quickly to any emergency situation.”
Vital messages All construction workers and staff are individually identified to the system by their RFID tags. RFID readers are located at entrance and exit points to the tunnels. Te Tetra radios, provided as part of a system
to support secure voice and data traffic, are used to display employee numbers in each location and to receive technical and critical alarm information via text messaging. Panic buttons on the radios and wall-mounted alarm points enable any employee to activate emergency evacuation alarms from anywhere within a tunnel. Zonith’s software is used to manage all
technical and critical safety alarms. Te software
Workers entering and leaving the tunnel sections are automatically registered by RFID tags. If an evacuation alarm is triggered, safety staff are immediately notified about how many people are inside the tunnel
automatically dispatches information to the available resources over the Tetra radios via text message. Immediate action can then be taken, minimizing delays in construction. Te Zonith Alarm Control System is installed
on a server above ground. It links to remotely- located real-time control units (RTCUs) via Tetra. Each RTCU is connected to fire sensors, technical alarms and evacuation panic alarm buttons. When an alarm is raised, the RTCU
RFID tag information is fed directly into the alarm control system. In the event of an emergency, the manager responsible for evacuation automatically receives immediate details of workers remaining in the tunnels
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immediately notifies the Alarm Control System, which instantly selects the safety staff from a duty roster. Staff are immediately notified with the exact emergency alarm details on their radios and managers can decide whether to order the evacuation of the tunnel or sections of tunnel.
TE TRA TODAY Issue 1 November 2010 - February 2011
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