TETRASUPPLEMENT 03


Public transport networks are adopting TETRA across Europe Three of the latest systems are in Zaragoza (Spain) Stockholm (Sweden) and Istanbul (Turkey).


Zaragoza In Spain, the inaugural line of the Zaragoza City Tramway has opened, supported by a TETRA network from Teltronic. The network is used mainly for the transmission of data from the


Operations Aid System (SAE in Spanish) between the trams and the Operations & Control Centre, including periodic location service, traffic parameters, open and pre- defined text messages, call requests (normal, urgent and emergency) and the activation of the public address system.


Stockholm In the capital of Sweden, Stockholm’s city transport authority Storstockholms Lokaltrafik


AB (SL), has selected TETRA radio communications from Sepura to update the voice and data communications for its tram and light-rail operations. Radio units will be installed on trams and trains, serving the 1,100,000 people who use the Stockholm public transport network daily. The radios will be used for transmitting voice and data – the latter primarily Automatic Vehicle Location (AVL) information, which will be used mainly to assist in dealing with incidents or accidents.


Istanbul In Turkey, the Istanbul City Municipality has implemented a multi-site TETRA system from Rohill covering the critical communication requirements of the public transport networks. The system covers the tram line, the metro, LRT and all tram lines on the European side and Istanbul’s Asian side Metro. The system is designed to expand with the transportation network and is optimised to serve all services of the Istanbul Municipality.


Phil Kidner is CEO of the TETRA Association, which represents a membership of 150 organisations around the world. Phil’s main responsibility is to promote the TETRA standard and its benefits of security,


Stockholm’s city transport authority SL has selected TETRA radio communications from Sepura to update the voice and data communications for its tram and light-rail operations.


resilience and interoperability, and manage its evolution to ensure the needs of all users are met. As the communications world converges, Phil is building and strengthening relationships with industry organisations and user groups across the world to help drive the TETRA market forward.


French public transport and TETRA


Pierre Minot President, ETELM


TETRA has been in use very successfully for French and Swiss urban transport since 2002. ETELM provided the majority of these networks: notably Marseille, Bordeaux (tramway), Toulouse, Strasbourg, Nice, Rennes, Nime, Clermont Ferrand, Grenoble, Mulhouse, Le Mans, Valencienne, Rouen, Reims, Geneva, Lausanne, and Fribourg. The success may be attributed to a perfect fit between TETRA services and specific urban transport requirements.


Fast polling Bus and tramway geo-positioning is critical for red light priority, passenger information, regulation, typically the position of the entire fleet within a town must be updated every 20 seconds. Such communications traffic is


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achieved using short messages which are easily supported with TETRA SDS messaging. The network must be able to handle up to 45 polls per second and per TETRA carrier, this is achieved using standard TETRA functions on Secondary Control Channels.


IP packet data (and multi-slot IP packet) are,


in general, only used for downloading specific parameters to the bus and uploading certain reports such as billing. In many cases, it is used only as a complement to the local RLAN generally located in some typical points such as parking entrance.


Security Emergency procedures are a common function and essential for any French urban transport network. In case of distress, a specific call back request is sent to the


Eurotransport Volume 9, Issue 3, 2011


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