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Redes PMR, Redes TETRA EN

At Técnicas Competitivas, we specialize in the most widespread mobile communications services, such as the terrestrial mobile telephony, mobile satellite communication, private PMR mobile networks, TETRA networks, radio messaging, GPS geolocation, WiFi wireless communication, WiMAX and mobile internet access.

The PMR networks are private mobile radio networks used by cell phones provisioned with this technology and do not connect with the public networks. Such networks are for closed user groups only, and are useful as the networks provide device connectivity within a certain environment by connecting to the control center, which works this way: connection to a station through the base station, fixed connection through land phone lines. PMR applications manage radio communications by means of fleets that provide services such as security, fire brigade, cab services, and so on.


The trunked radio system, developed in the early 1980s, has evolved from PMR and was born out of the need to improve the use of the available radio channels restriction. The trunked radio system allows for the use of few radio frequency channels more efficiently.


TETRA (TErrestrial Trunked RAdio) is a standard defined by the European Telecommunications Standards Institute (ETSI). This standard defines a digital mobile radio system and was created by a decision of the European Union in order to unify various alternatives of digital radio interfaces for communication between professionals from the sectors listed below. It can be said that TETRA is an improved version of the trunked radio system.


The use of this standard is aimed at highly specialized professional solutions, where the mentioned characteristics (reliability, costs) play an important role such as critical sectors like emergency services(police departments, fire brigades, ambulances, etc.) and for other types of data transmission. The differences in features, with respect to the GSM telephony, are as follows:

  • Use of a much lower frequency band, lowering the need for repeaters to cover the same geographic area.
  • Own infrastructure, separate from public mobile telephone networks, since repeaters work to a greater distance.
  • In the event of communication failures, it functions in device-to-device mode.
  • A more modern digital system than GSM with superior sound quality, as it implements a more advanced  data compression system.
  • Data transmission capabilities are defined in the initial standard itself and are only comparable to the current GPRS technology.
  • It enables group communications, which improves the management for coordination in the event of emergencies.
  • You have a specific device for every need. There are handheld devices (similar to cell phones) mobile devices (for vehicles) and devices for base stations.