View source for TETRA

{{Short description|European standard for trunked radio systems}}
{{Other uses|Tetra (disambiguation)}}
{{Infobox company
|name = Terrestrial Trunked Radio
|type = [[Privately held company|Incentive]]
|industry = [[European Telecommunications Standards Institute]]<br />[[professional mobile radio]]<br />[[trunked radio system]]
|foundation = 1995<br />[[Europe]]
|location = [[Europe]]
}}
'''Terrestrial Trunked Radio'''<ref>ETSI EN 300 392-2 v3.2.1</ref> ('''TETRA'''; formerly known as '''Trans-European Trunked Radio'''), a European standard for a [[trunked radio system]], is a [[professional mobile radio]]<ref>{{cite web |url=http://www.tetra-association.com |title=TETRA Association |publisher=TETRA Association |date=2012-03-22 |access-date=2012-03-28 |archive-url=https://web.archive.org/web/20180816135750/http://www.tetra-association.com/ |archive-date=2018-08-16 |url-status=dead}}</ref> and two-way transceiver specification. TETRA was specifically designed for use by government agencies, emergency services, ([[police]] forces, [[fire departments]], [[ambulance]]) for [[public safety network]]s, rail transport staff for [[train radio]]s, transport services and the [[military]].<ref>{{Cite news|url=http://www.pst.at/solutions-2/tetra/|title=TETRA - PST|newspaper=PST|access-date=2017-01-25|archive-date=2018-02-28|archive-url=https://web.archive.org/web/20180228041227/http://www.pst.at/solutions-2/tetra/|url-status=dead}}</ref> TETRA is the [[Europe]]an version of trunked radio, similar to [[Project 25]].

TETRA is a [[European Telecommunications Standards Institute]] (ETSI) standard,<ref>{{cite web |title=TETRA |url=https://www.etsi.org/technologies/tetra |website=ETSI - TETRA TErrestrial Trunked RAdio |publisher=ETSI |access-date=6 February 2025 |archive-date=26 January 2025 |archive-url=https://web.archive.org/web/20250126124451/https://www.etsi.org/technologies/tetra |url-status=live}}</ref> first version published 1995; it is mentioned by the [[Electronic Communications Committee|European Radiocommunications Committee]] (ERC).<ref>{{cite web |title=Guide to the R&TTE Directive 1999/5/EC (April 20, 2009) |url=http://www.ero.dk/B8FF1CC0-8C6C-4C8C-9019-7EB21FCABBD6?frames=no& |pages=9–10 |access-date=October 18, 2011 |archive-date=April 2, 2012 |archive-url=https://web.archive.org/web/20120402025219/http://www.ero.dk/B8FF1CC0-8C6C-4C8C-9019-7EB21FCABBD6?frames=no& |url-status=live}}</ref>

== Description ==
TETRA uses [[time-division multiple access]] (TDMA) with four user channels on one radio [[carrier wave|carrier]] and 25&nbsp;kHz spacing between carriers. Both [[point-to-point (telecommunications)|point-to-point]] and [[point-to-multipoint]] transfer can be used. Digital data transmission is also included in the standard though at a low data rate.

TETRA Mobile Stations (MS) can communicate direct-mode operation (DMO) or using [[Trunked radio system|trunked]]-mode operation (TMO) using switching and management infrastructure (SwMI) made of TETRA base stations (TBS). As well as allowing direct communications in situations where network coverage is not available, DMO also includes the possibility of using a sequence of one or more TETRA terminals as relays. This functionality is called DMO gateway (from DMO to TMO) or DMO repeater (from DMO to DMO). In emergency situations this feature allows direct communications underground or in areas of bad coverage.

In addition to voice and dispatch services, the TETRA system supports several types of [[data communication]]. Status messages and ''short data services'' (SDS) are provided over the system's main control channel, while packet-switched data or circuit-switched data communication uses specifically assigned channels.

TETRA provides for authentication of terminals towards infrastructure and vice versa. For protection against eavesdropping, air interface encryption and end-to-end encryption is available.

The common mode of operation is in a [[group call|group calling mode]] in which a single button push will connect the user to the users in a selected call group and/or a [[dispatcher]]. It is also possible for the terminal to act as a one-to-one walkie talkie but without the normal range limitation since the call still uses the network. TETRA terminals can act as [[mobile phone]]s ([[cell phone]]s), with a [[Full-duplex#Full-duplex|full-duplex]] direct connection to other TETRA Users or the [[PSTN]]. Emergency buttons, provided on the terminals, enable the users to transmit emergency signals, to the [[dispatcher]], overriding any other activity taking place at the same time.

== Advantages ==
The main advantages of TETRA over other technologies (such as [[GSM]]) are:

* The much lower frequency used gives longer range, which in turn permits very high levels of ''geographic'' coverage with a smaller number of transmitters, thus cutting infrastructure costs.
* During a voice call, the communications are not interrupted when moving to another network site. This is a unique feature, which dPMR networks typically provide, that allows a number of fall-back modes such as the ability for a base station to process local calls. So called 'mission critical' networks can be built with TETRA where all aspects are fail-safe/multiple-redundant.
* In the absence of a network, mobiles/portables can use 'direct mode' whereby they share channels directly (walkie-talkie mode).
* Gateway mode - where a single mobile with connection to the network can act as a relay for other nearby mobiles that are out of range of the infrastructure. A dedicated [[transponder]] system isn't required in order to achieve this functionality, unlike with analogue radio systems.
* TETRA also provides a point-to-point function that traditional analogue emergency services radio systems did not provide. This enables users to have a one-to-one trunked 'radio' link between sets without the need for the direct involvement of a control room operator/dispatcher.
* Unlike cellular technologies, which connect one subscriber to one other subscriber (one-to-one), TETRA is built to do one-to-one, [[point-to-multipoint communication|one-to-many]] and [[many-to-many]]. These operational modes are directly relevant to the public safety and professional users.
* Security TETRA supports terminal registration, authentication, air-interface encryption and [[end-to-end encryption]].{{Citation needed|date = May 2015}}
* Rapid deployment (transportable) network solutions are available for disaster relief and temporary capacity provision.
* Network solutions are available in both reliable circuit-switched (telephone like) architectures and flat, IP architectures with soft (software) switches.

Further information is available from the [http://www.tandcca.com/ TETRA Association] (formerly TETRA MoU) and the standards can be downloaded for free from [[ETSI]].

== Disadvantages ==
Its main disadvantages are:

* Security issues have been identified, although mitigations were quickly introduced in the TETRA security standard. There was an intentional weakening of the TEA1 cipher to meet export control criteria, allowing a break within a minute on consumer hardware. (See [[#vulns|Description]])
* Requires a [[linear amplifier]] to meet the stringent RF specifications that allow it to exist alongside other radio services.
* Data transfer is slow by modern standards.
Up to 7.2&nbsp;kbit/s per timeslot, in the case of point-to-point connections, and 3.5&nbsp;kbit/s per timeslot in case of IP encapsulation.
Both options permit the use of between one and four timeslots.
Different implementations include one of the previous connectivity capabilities, both, or none, and one timeslot or more.
These rates are ostensibly faster than the competing technologies DMR, dPMR, and P25 are capable of. 
Latest version of standard supports 115.2&nbsp;kbit/s in 25&nbsp;kHz or up to 691.2&nbsp;kbit/s in an expanded 150&nbsp;kHz channel. To overcome the limitations many software vendors have begun to consider hybrid solutions where TETRA is used for critical signalling while large data synchronization and transfer of images and video is done over 3G / [[LTE (telecommunication)|LTE]] / 5G.<ref>{{cite web |url=http://www.crystalcode.co.uk/TETRA |title=Smartphone app/apps over TETRA |website=Crystal Code AB |access-date= 2013-07-16 |url-status=dead |archive-url=https://web.archive.org/web/20140529052001/http://www.crystalcode.co.uk/TETRA |archive-date= 2014-05-29}}</ref>
 
== Technical details ==

=== Radio aspects ===
For its modulation TETRA, uses [[Phase-shift keying|{{frac|π|4}} differential quadrature phase-shift keying]]. The symbol (baud) rate is 18,000 symbols per second, and each symbol maps to 2 bits, thus resulting in 36,000&nbsp;bit/s gross.

As a form of phase shift keying is used to transmit data during each burst, it would seem reasonable to expect the transmit power to be constant. However it is not. This is because the [[sideband]]s, which are essentially a repetition of the data in the main carrier's modulation, are filtered off with a sharp filter so that unnecessary spectrum is not used up. This results in an amplitude modulation and is why TETRA requires linear amplifiers. The resulting ratio of peak to mean (RMS) power is 3.65&nbsp;dB. If non-linear (or not-linear enough) amplifiers are used, the sidebands re-appear and cause interference on adjacent channels. Commonly used techniques for achieving the necessary [[Amplifier#Linearity|linearity]] include Cartesian loops, and adaptive predistortion.

The base stations normally transmit continuously and (simultaneously) receive continuously from various mobiles on different carrier frequencies; hence the TETRA system is a frequency-division duplex (FDD) system. TETRA also uses FDMA/TDMA (see above) like GSM. The mobiles normally only transmit on 1 slot/4 and receive on 1 slot/4 (instead of 1 slot/8 for GSM).

Speech signals in TETRA are sampled at 8&nbsp;kHz and then compressed with a [[vocoder]] using ''[[ACELP|algebraic code-excited linear prediction]]'' (ACELP). This creates a data stream of 4.567&nbsp;kbit/s. This data stream is error-protection encoded before transmission to allow correct decoding even in noisy (erroneous) channels. The data rate after coding is 7.2&nbsp;kbit/s. The capacity of a single traffic slot when used 17/18 frames.

A single slot consists of 255 usable symbols, the remaining time is used up with synchronisation sequences and turning on/off, etc. A single ''frame'' consists of 4 slots, and a ''multiframe'' (whose duration is 1.02 seconds) consists of 18 frames. Hyperframes also exist, but are mostly used for providing synchronisation to encryption algorithms.

The downlink (i.e., the output of the base station) is normally a continuous transmission consisting of either specific communications with mobile(s), synchronisation or other general broadcasts. All slots are usually filled with a burst even if ''idle'' (continuous mode). Although the system uses 18 frames per second only 17 of these are used for traffic channels, with the 18th frame reserved for signalling, Short Data Service messages (like SMS in GSM) or synchronisation. The frame structure in TETRA (17.65 frames per second), consists of 18,000 symbols/s; 255 symbols/slot; 4 slots/frame, and is the cause of the ''perceived'' "amplitude modulation" at 17&nbsp;Hz and is especially apparent in mobiles/portables which only transmit on one slot/4. They use the remaining three slots to switch frequency to receive a burst from the base station two slots later and then return to their transmit frequency ([[time-division multiple access|TDMA]]).

=== Radio frequencies ===
[[File:EU Tetra bands by Country.png|thumb|Chart to visualize the bands used for TETRA in Europe]]

{| class="wikitable"
|+ TETRA frequencies in South America
|-
! rowspan="2" | Number !! colspan="2" | Frequency pair (MHz)
|-
! Band 1 !! Band 2
|-
! colspan="3" | Emergency systems
|-
| 1 || 380–383 || 390–393
|-
| 2 || 383–385 || 393–395
|-
! colspan="3" | Civil systems
|-
| 1 || 410–420 || 420–430
|-
| 2 || 870–876 || 915–921
|-
| 3 || 450–460 || 460–470
|-
| 4 || 385–390 || 395–399.9
|}

{| class="wikitable"
|+ TETRA frequencies in other countries
|-
! Country
! Allocation
! Frequency pairs (MHz)
|-
| style="vertical-align: top;" rowspan="2" | France
| Civilian/private
| 410–430
|-
| Emergency services
| 380–400
|-
| rowspan="2" | Belgium
| Emergency services/civilian
| 380–386.5, 390–396.5
|-
|Commercial
|410-420
|-
| style="vertical-align: top;" rowspan="2" | the Netherlands
| Emergency services
| 380–386.5, 390–396.5
|-
| Civil/Commercial
| 410–430
|-
| Germany
| Emergency services
| 380–385, 390–395, 406 - 410 for DMO
|-
| style="vertical-align: top;" rowspan="2" | Ireland<ref>{{Cite web |title=Radio Spectrum - Table of frequency allocations |url=http://www.comreg.ie/radio_spectrum/table_of_frequency_allocations.496.410.html |url-status=live |archive-url=https://web.archive.org/web/20160304030117/http://www.comreg.ie/radio_spectrum/table_of_frequency_allocations.496.410.html |archive-date=2016-03-04 |website=ComReg}}</ref>
| Civilian/private
| 385–389.9, 395–399.9
|-
| Emergency services
| 380–385, 390–395
|-
| style="vertical-align: top;" rowspan="2" | Italy
| Emergency services / armed forces
| 380–390
|-
| Civilian/private
| 462
|-
| Norway<ref>{{cite web |url-status=dead |url=http://www.npt.no/pt_internet/ressursforvaltning/frekvenser/frekvensplan/uhf_frames.html |archive-url=https://web.archive.org/web/20050112204801/http://www.npt.no/pt_internet/ressursforvaltning/frekvenser/frekvensplan/uhf_frames.html |archive-date=2005-01-12 |website=Post- og teletilsynet |title=National Table of Frequency Allocations}}</ref>
| Emergency services
| 380–385, 390–395, 406.1–426, 870–876
|-
| Slovenia
| Emergency services
| 380-385 (MS), 390-395 (BS)
|-
| South Africa
| Emergency services, Public works
| 420–423
|-
| style="vertical-align:top;" rowspan="2"|  Sweden
|Emergency services
|380-395
|-
|Civilian/airport/public transportation
|425-429
|-
| style="vertical-align:top;" rowspan="5"| UK
| Airwave
| 390.0125–394.9875, 380.0125–384.9875
|-
| Airwave (London only)
| 420.0125-421.9875, 410.0125–412.9875
|-
| Prison service
| 450, 460 / 452, 462
|-
| AirRadio
| 454, 464 or 460
|-
| Offshore Oil platforms
| 423, 413
|-
| rowspan="2" |Hong Kong<ref>{{Cite web |last=Office of the Communications Authority |date=2022-05-25 |title=Table of Frequency Allocations of Hong Kong |url=https://www.ofca.gov.hk/filemanager/ofca/common/Industry/broadcasting/hk_freq_table_en.pdf}}</ref>
|Emergency services
|382.65–399.9, 410–430
|-
|Civil/Private
|806–818, 851–863
|-
| style="vertical-align:top;" rowspan="2"| Portugal
| SIRESP - Public Safety
| 380–395
|-
| Commercial/Private 
| 420–430
|-
| Saudi Arabia
|
| 350–370, 380–395, 385–399.99, 410–430, 450–470, 870–921
|}

=== Air interface encryption ===
To provide confidentiality the TETRA air interface is encrypted using one of the ''TETRA Encryption Algorithm'' (''TEA'') ciphers. The encryption provides confidentiality (protect against eavesdropping) as well as protection of signalling.

Currently 7 different ciphers are standardized: TEA1 to TEA4 in TEA Set A and TEA5 to TEA7 in TEA Set B. These TEA ciphers should not be confused with the block cipher [[Tiny Encryption Algorithm]].  The TEA ciphers have different availability due to export control<ref name=":0">{{cite web |title=The Wassenaar Arrangement On Export Controls for Conventional Arms and Dual-Use Goods and Technologies |url=https://www.wassenaar.org/ |website=The Wassenaar Arrangement |access-date=2025-02-23 |archive-date=2025-02-21 |archive-url=https://web.archive.org/web/20250221042543/https://www.wassenaar.org/ |url-status=live}}</ref> and use restrictions.<ref>{{cite web |title=ETSI TS 101 053-1..-7 |url=https://www.etsi.org/standards-search#page=1&search=101%20053&title=0&etsiNumber=1&content=0&version=1&onApproval=0&published=1&withdrawn=0&historical=0&isCurrent=1&superseded=0&startDate=1988-01-15&endDate=&harmonized=0&keyword=&TB=249&stdType=&frequency=&mandate=&collection=&sort=1 |website=Rules for the Management of the TETRA standard enryption algorithms; Part 1..7: TEA1..TEA7}}</ref>  In the past few details were published concerning these proprietary ciphers. Riess<ref>{{Cite web | url=https://ieeexplore.ieee.org/document/369664 |title = Cryptographic security for the new trans-European trunked radio (TETRA) standard|pages = 3/1–3/5|date = June 1994}}</ref> mentions in early TETRA design documents that encryption should be done with a [[stream cipher]], due to the property of not propagating transmission errors. Parkinson<ref>
{{cite journal
| author = DW Parkinson
| title = TETRA Security
| journal = BT Technology Journal
| volume = 19
| issue = 3
| date = 2001-07-01
| pages = 81–88
| doi = 10.1023/A:1011942300054
| s2cid = 169255984
}}</ref> later confirms this and explains that TEA is a stream cipher with 80-bit keys. The algorithms were later reversed and it appeared that TEA1 reduces its key strength to 32 bits<ref>{{Cite magazine |last=Zetter |first=Kim |title=Code Kept Secret for Years Reveals Its Flaw—a Backdoor |magazine=Wired |url=https://www.wired.com/story/tetra-radio-encryption-backdoor/ |access-date=2023-07-24 |issn=1059-1028 |archive-date=2023-07-24 |archive-url=https://web.archive.org/web/20230724103233/https://www.wired.com/story/tetra-radio-encryption-backdoor/ |url-status=live}}</ref> to allow exportability under the Wassenaar arrangement.<ref name=":0" /><ref name=":1">{{Cite web |date=2024 |title=TETRA – Security Standard |url=https://www.etsi.org/deliver/etsi_ts/100300_100399/10039207/04.01.01_60/ts_10039207v040101p.pdf}}</ref><ref name=":2">{{Cite web |date=August 2025 |title=TETRA security disclosures |url=https://tcca.info/tetra/tetra-documentation/research_disclosures/ |website=tcca.info/tetra}}</ref> TEA1 and TEA4 provide ''basic level'' security, and are meant for commercial use.<ref>Doug Gray, [http://portal.etsi.org/workshopps/Presentations/0103TETRA.pdf An Overview of TETRA] {{Webarchive|url=https://web.archive.org/web/20110927131812/http://portal.etsi.org/workshopps/Presentations/0103TETRA.pdf |date=2011-09-27}}, [http://portal.etsi.org etsi.org] {{Webarchive|url=https://web.archive.org/web/20100326032216/http://portal.etsi.org/ |date=2010-03-26}}.</ref> The TEA2 cipher is restricted to European public safety organisations. The TEA3 cipher is for situations where TEA2 is suitable but not available.<ref>
{{cite journal
| author =Gert Roelofsen
| title = Cryptographic algorithms in telecommunications systems
| journal = Information Security Technical Report
| volume = 4
| year = 1999
| pages = 29–37
| doi         = 10.1016/S1363-4127(99)80004-1
}}</ref>

==== Security vulnerabilities of the air interface encryption ====
{{cleanup rewrite|date=November 2023}}

{{anchor|vulns}} An in-depth review published in July 2023 by the company Midnight Blue of the TETRA standard and encryption algorithms, claims multiple security flaws, referred by the company as "TETRA:BURST". A total of 5 flaws were filed to the [[Common Vulnerabilities and Exposures|CVE]] database:<ref name="burst">{{cite web |author=Midnight Blue |title=TETRA:BURST |url=https://www.tetraburst.com/ |access-date=2023-07-26 |archive-date=2023-07-26 |archive-url=https://web.archive.org/web/20230726120738/https://www.tetraburst.com/ |url-status=live}}</ref>

* The Air Interface Encryption (AIE) keystream generator is vulnerable to decryption [[oracle attack]]s due to the use of publicly-broadcast network time<ref name="burst" />—keystream reuse can be triggered for acknowledged unicast communication when using static keys (security class 2). This is not applicable for group communication.<ref name="burst-paper">{{cite conference |author=Midnight Blue |date=August 2023 |title=All Cops Are Broadcasting: Breaking TETRA after decades in the shadows (slideshow) |url=https://i.blackhat.com/BH-US-23/Presentations/US-23-Meijer-All-Cops-Are-Broadcasting.pdf |conference=Blackhat USA 2023 |access-date=2023-08-11 |archive-date=2023-08-11 |archive-url=https://web.archive.org/web/20230811121629/https://i.blackhat.com/BH-US-23/Presentations/US-23-Meijer-All-Cops-Are-Broadcasting.pdf |url-status=live}}
{{cite conference |author1=Carlo Meijer |author2=Wouter Bokslag |author3=Jos Wetzels |date=August 2023 |title=All cops are broadcasting: TETRA under scrutiny (paper) |url=https://uploads-ssl.webflow.com/64a2900ed5e9bb672af9b2ed/64d42fcc2e3fdcf3d323f3d9_All_cops_are_broadcasting_TETRA_under_scrutiny.pdf |conference=Usenix Security 2023 |access-date=2023-08-11 |archive-date=2023-08-11 |archive-url=https://web.archive.org/web/20230811143013/https://uploads-ssl.webflow.com/64a2900ed5e9bb672af9b2ed/64d42fcc2e3fdcf3d323f3d9_All_cops_are_broadcasting_TETRA_under_scrutiny.pdf |url-status=live}}</ref> Mitigations for this were introduced into version 4 of the TETRA standard.<ref name=":2" /><ref name=":3">{{Cite web |date=17 October 2024 |title=TETRA – Securing the future – ETSI Security Conference 2024. |url=https://docbox.etsi.org/Workshop/2024/10_SECURITYCONFERENCE/17OCTOBER/D42_MURGATROYD_TCCE.pdf}}</ref> 
* TEA1 contains a reduction step that effectively downgrades the cryptographic strength from 80 to 32 bits implemented to allow export under the Wassenaar convention,<ref name=":0" /><ref name=":1" /><ref name=":2" /> allowing anyone to break the cipher and subsequently decrypt the signal in as little as one minute using a modern-day consumer laptop. "There's no other way in which this can function than that this is an intentional backdoor," "This constitutes a full break of the cipher, allowing for interception or manipulation of radio traffic", according to the news report posted on ''[[ComputerWeekly]]''.<ref>{{Cite news |last1=Scroxton |first1=Alex |date=25 Jul 2023 |title=Tetra radio users' comms may have been exposed for years |url=https://www.computerweekly.com/news/366545593/Tetra-radio-users-comms-may-have-been-exposed-for-years |url-access=registration |url-status=live |archive-url=https://web.archive.org/web/20230726133501/https://www.computerweekly.com/news/366545593/Tetra-radio-users-comms-may-have-been-exposed-for-years |archive-date=2023-07-26 |access-date=2023-07-26 |newspaper=Computer Weekly}}</ref> The reduction in strength of TEA1 seems to be known in intelligence circles and is referred to in the famous 2006 Wikileaks dump of US diplomatic communications.<ref name="burst-paper" />
* AIE contains no [[authentication tag|authentication]] for the ciphertext, making [[Malleability (cryptography)|malleability]] attacks possible.<ref name="burst" />
* The cryptographic anonymization scheme is weak and can be partially reversed to track users.<ref name="burst" /> A revised identity encription scheme was introduced in version 4 of the TETRA standard in mitigation.<ref name=":1" /><ref name=":3" />
* The authentication algorithm theoretically allowed attackers to set the derived cipher key to 0 but not to decrypt traffic.<ref name="burst-paper" /> Although this attack remains theoretical, mitigations were introduced in version 4 of the TETRA security standard.<ref name=":1" /><ref name=":3" />

In addition, the Midnight Blue team spots a "peculiarity regarding the TEA3 [[S-box]]", but further analysis has not been shown to lead to any weakness.<ref name="burst-paper" />

The vulnerabilities related to algorithms remained publicly unknown for 28 years after TETRA's publication because TETRA did not initially make definitions of its cryptographic algorithms public, an example of [[security through obscurity]], although details have now been made public.<ref name=":3" /> The Midnight Blue team gained access to TETRA's cryptographic code by attacking the [[trusted execution environment]] on a TETRA-enabled radio. The team points to a list of previously broken cryptographic systems relying on obscurity and argues that the [[Kerckhoffs's principle]] should have been followed: the system would have been safer when its structure is publicly known,<ref name="burst-paper" /> despite common practice for encryption systems for government use to remain confidential.<ref name=":3" />

=== Cell selection ===

==== Cell re-selection (or hand-over) in images ====
[[Image:Cell neighbours 01.svg|thumb|RSSI SRT FRT cell limit (propagation delay exceed)]]

This first representation demonstrates where the slow reselect threshold (SRT), the fast reselect threshold (FRT), and propagation delay exceed parameters are most likely to be. These are represented in association with the decaying radio carrier as the distance increases from the TETRA [[base station]].

From this illustration, these SRT and FRT triggering points are associated to the decaying radio signal strength of the respective cell carriers. The thresholds are situated so that the cell reselection procedures occur on time and assure communication continuity for on-going communication calls.
{{clear}}

==== Initial cell selection ====
[[Image:Cell initial selection.JPG|thumb|Cell initial selection]]

The next diagram illustrates where a given TETRA radio cell initial selection. The initial cell selection is performed by procedures located in the MLE and in the MAC. When the cell selection is made, and possible registration is performed, the ''mobile station'' (MS) is said to be attached to the cell. The mobile is allowed to initially select any suitable cell that has a positive C1 value; i.e., the received signal level is greater than the ''minimum receive level for access'' parameter.

The initial cell selection procedure shall ensure that the MS selects a cell in which it can reliably decode downlink data (i.e., on a main control channel/MCCH), and which has a high probability of uplink communication. The minimum conditions that shall have to be met are that C1 > 0. Access to the network shall be conditional on the successful selection of a cell.

At mobile switch on, the mobile makes its initial cell selection of one of the base stations, which indicates the initial exchanges at activation.

* Refer to EN 300 392 2 16.3.1 Activation and control of underlying MLE service
* Note 18.5.12 Minimum RX access level

The minimum receive access level information element shall indicate the minimum received signal level required at the SwMI in a cell, either the serving cell or a neighbour cell as defined in table 18.24.
{{clear}}

==== Cell improvable ====
[[Image:Cell improvable.JPG|thumb|Cell improvable]]

The next diagram illustrates where a given TETRA radio cell becomes ''improvable''. The serving cell becomes improvable when the following occurs: the C1 of the serving cell is below the value defined in the radio network parameter cell reselection parameters, slow reselect threshold for a period of 5 seconds, and the C1 or C2 of a neighbour cell exceeds the C1 of the serving cell by the value defined in the radio network parameter cell reselection parameters, slow reselect hysteresis for a period of 5 seconds.
{{clear}}

==== Cell usable ====
[[Image:Cell usable 01.JPG|thumb|Cell usable]]

The next diagram illustrates where a given TETRA radio cell becomes ''usable''. A neighbour cell becomes radio usable when the cell has a downlink radio connection of sufficient quality.

The following conditions must be met in order to declare a neighbour cell radio usable: The neighbour cell has a path loss parameter C1 or C2 that is, for a period of 5 seconds, greater than the fast reselect threshold plus the fast reselect threshold, and the service level provided by the neighbour cell is higher than that of the serving cell. No successful cell reselection shall have taken place within the previous 15 seconds unless MM requests a cell reselection. The MS-MLE shall check the criterion for serving cell relinquishment as often as one neighbour cell is scanned or monitored.

The following conditions will cause the MS to rate the neighbour cell to have higher service level than the current serving cell:
* The MS subscriber class is supported on the neighbour cell but not on the serving cell.
* The neighbour cell is a priority cell and the serving cell is not.
* The neighbour cell supports a service (that is, TETRA standard speech, packet data, or encryption) that is not supported by the serving cell and the MS requires that service to be available.
* The cell service level indicates that the neighbour cell is less loaded than the serving cell.
{{clear}}

==== Cell relinquishable (abandonable) ====
[[Image:Cell relinquishable 01.JPG|thumb|Cell relinquishable]]

The next diagram illustrates where a given TETRA radio cell becomes ''relinquishable'' (''abandonable''). The serving cell becomes relinquishable when the following occurs: the C1 of the serving cell is below the value defined in the radio network parameter cell reselection parameters, fast reselect threshold, for a period of 5 seconds, and the C1 or C2 of a neighbour cell exceeds the C1 of the serving cell by the value defined in the radio network parameter cell reselection parameters, fast reselect hysteresis, for a period of 5 seconds.

No successful cell reselection shall have taken place within the previous 15 seconds unless Mobility Management (MM) requests a cell reselection. The MS-MLE shall check the criterion for serving cell relinquishment as often as one neighbour cell is scanned or monitored.

==== Radio down-link failure ====
[[Image:Terrestrial Trunked Radio RDF diagram.jpg|thumb|Radio down-link failure]]

When the FRT threshold is breached, the MS is in a situation where it is essential to relinquish (or abandon) the serving cell and obtain another of at least ''usable'' quality. That is to say, the mobile station is aware that the radio signal is decaying rapidly, and must cell reselect rapidly, before communications are terminated because of radio link failure. When the mobile station radio-signal breaches the minimum receive level, the radio is no longer in a position to maintain acceptable communications for the user, and the radio link is broken.

Radio link failure: (C1 < 0). Using the suggested values, this would be satisfied with the ''serving cell level'' below −105&nbsp;dBm. Cell reselection procedures are then activated in order to find a suitable radio base station.

{| class="wikitable" style="text-align:center"
|+ Infrastructure TETRA parameters guide{{efn|Data to be verified}}<!-- Verified how, when, by whom? -->
|-
! Coverage !! Parameter !! Distance (km) !! Type of communication
|-
! City
|   < 4 ||   < 8 || Pedestrian/metro
|-
! Sub-urban
| 10–18 || 20–36 || Bus/train
|-
! Countryside
| 18–31 || 36–62 || Inter-regional train
|-
! In Air
|  > 32 ||  > 64 || In flight
|-
| colspan=4 | {{Notelist}}
|}
{{clear}}

== Man-machine interface (MMI) ==

=== Virtual MMI for terminals ===
Any given TETRA radio terminal using [[Java (programming language)|Java]] ([[Java ME]]/[[CLDC]]) based technology, provides the end user with the communication rights necessary to fulfil his or her work role on any short duration assignment.

For dexterity, flexibility, and evolution ability, the public transportation radio engineering department, have chosen to use the open sources, Java language specification administered by Sun and the associated work groups in order to produce a ''transport application tool kit''.

Service acquisition admits different authorised agents to establish communication channels between different services by calling the service identity, and without possessing the complete knowledge of the ISSI, GSSI, or any other TETRA related communication establishment numbering plan. Service acquisition is administered through a ''communication rights centralised service'' or ''roll allocation server'', interfaced into the TETRA core network.

In summary, the TETRA MMI aims are to: 
* Allow any given agent while in exercise, to exploit any given radio terminal without materiel constraint.
* Provide specific transportation application software to the end-user agents (service acquisition, fraud, and aggression control).

This ''transport application tool-kit'' has been produced successfully and with TETRA communication technology and assures for the public transport application requirements for the future mentioned hereafter.

The ''home'' (''main'') menu presents the end user with three possibilities: 
# Service acquisition
# Status SDS
# End-user parameters

''Service acquisition'' provides a means of virtually personalising the end user to any given radio terminal and onto TETRA network for the duration the end user conserves the terminal under his possession.

Status SDS provides the end user with a mechanism for generating a 440&nbsp;Hz repeating tone that signals a fraud occurrence to members within the same (dynamic or static) Group Short Subscriber Identity (GSSI) or to a specific Individual Short Subscriber Identity ([[Subscriber Identity Module|ISSI]]) for the duration of the assignment (an hour, a morning patrol or a given short period allocated to the assignment). The advantage being that each of the end users may attach themselves to any given terminal, and group for short durations without requiring any major reconfiguration by means of radio software programming tools. Similarly, the aggression feature functions, but with a higher tone frequency (880&nbsp;Hz), and with a quicker repetitious nature, so to highlight the urgency of the alert.

The ''parameters'' tab provides an essential means to the terminal end-user allowing them to pre-configure the target (preprogrammed '''[[Subscriber Identity Module|ISSI]]''' or '''GSSI''' ) destination communication number. With this pre-programmed destination number, the end-user shall liaise with the destination radio terminal or ''roll allocation server'', and may communicate, in the group, or into a dedicated server to which the service acquisition requests are received, preprocessed, and ultimately dispatched though the TETRA core network. This simplifies the reconfiguration or recycling configuration process allowing flexibility on short assignments.

The parameters tab also provides a means of choosing between preselected tones to match the work group requirements for the purposes of fraud and aggression alerts. A possibility of selecting any given key available from the keypad to serve as an aggression or fraud quick key is also made possible though the transport application software tool kit. It is recommend to use the [[asterisk]] and the [[hash symbol|hash]] keys for the fraud and aggression quick keys respectively. For the fraud and aggression tones, it is also recommend to use 440&nbsp;Hz slow repeating tone (blank space 500 milli-seconds) and 880&nbsp;Hz fast repeating tone (blank space 250 milliseconds) respectively.  The tone options are as follows: 440&nbsp;Hz, 620&nbsp;Hz, 880&nbsp;Hz, and 1060&nbsp;Hz.

The ''parameters'' page provides an ''aid'' or ''help'' menu and the last tab within parameters describes briefly the tool kit the version and the history of the transport application tool kit to date.

=== TETRA Enhanced Data Service (TEDS) ===
The TETRA Association, working with ETSI, developed the TEDS standard, a wideband data solution, which enhances TETRA with a much higher capacity and throughput for data. In addition to those provided by TETRA, TEDS uses a range of adaptive modulation schemes and a number of different carrier sizes from 25&nbsp;kHz to 150&nbsp;kHz. Initial implementations of TEDS will be in the existing TETRA radio spectrum, and will likely employ 50&nbsp;kHz channel bandwidths as this enables an equivalent coverage footprint for voice and TEDS services. TEDS performance is optimised for wideband data rates, wide area coverage and [[Spectral efficiency#Comparison table|spectrum efficiency]].<ref>{{cite web | url=http://www.cmlmicro.com/Press/briefs/index.asp?/Press/briefs/teds_1.htm | title=Walasey Components Ltd - Beijing | access-date=2012-07-26 | archive-date=2012-06-27 | archive-url=https://web.archive.org/web/20120627051827/http://www.cmlmicro.com/Press/briefs/index.asp?/Press/briefs/teds_1.htm | url-status=dead}}</ref>

Advances in DSP technology have led to the introduction of multi-carrier transmission standards employing [[QAM]] modulation. WiMAX, Wi-Fi and TEDS standards are part of this family.

Refer also to:
* [[Java Community Process|JSR-118]];
* Mobile Information Device Profile, [[Java Community Process|JSR-37]];
* Wireless Messaging API, [[Java Community Process|JSR120]];
* Connected Limited Device Configuration, [[Java Community Process|JSR-139]]; and
* Technology for the Wireless Industry, [[Java Community Process|JTWI-185]].

== Comparison to Project 25 ==
Project 25 and TETRA are utilised for the public safety Radio network and Private Sector Radio network worldwide however, it has some differences in technical features and capacities.<ref>{{Cite web | url=https://www.powertrunk.com/docs/Pros_and_Cons_of_P25_vs_TETRA.pdf | title=Pros and Cons of TETRA vs. P25 and the Benefits of a Multi-technology Platform for TETRA, P25 Phase I / Phase II, and Mobile WiMax | website=www.powertrunk.com | first=Keith | last=Ammons | access-date=2018-06-05 | archive-date=2020-11-12 | archive-url=https://web.archive.org/web/20201112032321/https://www.powertrunk.com/docs/Pros_and_Cons_of_P25_vs_TETRA.pdf | url-status=live}}</ref><ref>{{cite web|url=https://psc.apcointl.org/2012/05/03/p25-and-tetra-technology-roundtable/|title=P25 and TETRA Technology Roundtable|date=3 May 2012}}</ref><ref>https://tandcca.com/fm_file/dubai06swancomparison-pdf/ {{Dead link|date=February 2022}}</ref>
* TETRA: It is optimized for high population density areas, with spectral efficiency (4 time slots in 25&nbsp;kHz: four communications channels per 25&nbsp;kHz channel, an efficient use of spectrum). It is suitable for high population density areas and supports full duplex voice, data and messaging; but, it is generally unavailable for simulcast, VHF band - however particular vendors have introduced Simulcast and VHF into their TETRA platform..
* P25:  it is optimized for wider area coverage with low population density, and support for simulcast. however, it is limited to data support. (Phase 1 P25 radio systems operate in a 12.5&nbsp;kHz analogue, digital or mixed mode, and  P25 Phase II will use a 2-timeslot TDMA structure in 12.5&nbsp;kHz channels.)
Currently,  P25 deployed to more than 53 countries and TETRA deployed to more than 114 countries.

== Professional usage ==
{{as of|2009|12|alt=At the end of 2009}} there were 114 countries using TETRA systems in Europe, Middle East, Africa, Asia Pacific, Caribbean and Latin America.<ref>{{cite web |url=http://www.tetrahealth.info/worldCountries.htm |title=TETRA Industry Group - TETRA around the world - Countries |publisher=Tetrahealth.info |access-date=2012-03-28 |url-status=dead |archive-url=https://web.archive.org/web/20120313035919/http://www.tetrahealth.info/worldCountries.htm |archive-date=2012-03-13}}</ref>

The TETRA-system is in use by the public sector in the following countries. Only TETRA network infrastructure installations are listed. TETRA being an open standard, each of these networks can use any mix of TETRA mobile terminals from a wide range of suppliers.

{| class="wikitable"
|-
! Continent
! Country
! Supplier
! Name
! Agency
! Status
|-
| rowspan="46" style="vertical-align:top;" | Asia
| style="vertical-align:top;" rowspan="4"| China mainland
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[Shenyang Metro]]
| Transport
| In use: Line 1<br />Rolling out: Line 2<ref>{{cite web |url=http://www.railway-technology.com/projects/shenyang-metro |title=Shenyang Metro |publisher=Railway Technology |date=2011-06-15 |access-date=2012-03-28 |archive-date=2012-03-25 |archive-url=https://web.archive.org/web/20120325011852/http://www.railway-technology.com/projects/shenyang-metro/ |url-status=live}}</ref>
|-
| DAMM TetraFlex
| [[Guangzhou]] Electric Power
| Utility - Guangzhou Electric Power Emergency Communication
| In use 2010
|-
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[Shenzhen Metro]]
| Transport
| Ordered 5/2010<ref name=eads20100528>{{cite web |url=http://classic.eads.net/1024/de/investor/News_and_Events/news_ir/2010/2010/20100528_eads_defence_tetra_shenzhen_metro.html |title=EADS Global Website - EADS Global Website |access-date=2016-02-08 |url-status=dead |archive-url=https://archive.today/20130221140731/http://classic.eads.net/1024/de/investor/News_and_Events/news_ir/2010/2010/20100528_eads_defence_tetra_shenzhen_metro.html |archive-date=2013-02-21}}</ref>
|-
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[Guangzhou]]
| 16th Asian Games in 2010
| Ordered 2010<ref name=eads20100528 />
|-
| rowspan="12" style="vertical-align:top;" | Hong Kong<ref>{{Cite web |last=Office of the Communications Authority |date=2022-09-13 |title=The Numbering Plan for Telecommunications Services in Hong Kong |url=https://www.ofca.gov.hk/filemanager/ofca/tc/content_311/no_plan.pdf}}</ref>
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]<ref>{{cite web |url=http://www.cassidian.com/cassidian/int/en/capabilities/security-solutions/mission-critical-networks-and-pmr/products/tetra-terminal.html |title=Home |publisher=Cassidian.com |access-date=2012-03-28 |url-status=dead |archive-url=https://web.archive.org/web/20110526135252/http://www.cassidian.com/cassidian/int/en/capabilities/security-solutions/mission-critical-networks-and-pmr/products/tetra-terminal.html |archive-date=2011-05-26}}</ref>
| [[Hong Kong International Airport]] (HKIA)
| 2008 Beijing Olympics and Paralympic Games (Hong Kong Equestrian Event)
| Used from July 2008 to October 2008
|-
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
|[[Hong Kong Fire Services Department]]
| Fire service and ambulance
| In use
|-
| Motorola / [[Dimetra]]
|[[Hong Kong Police Force]]
| Police
| In use
|-
|Motorola
|[[Hong Kong Correctional Services|Correctional Services Department]]
|Law enforcement
|In use
|-
|Motorola
|[[Immigration Department (Hong Kong)|Immigration Department]]
|Law enforcement
|In use
|-
|Motorola
| Mass Transit Railway ([[MTR]])<ref>{{cite web |url=http://www.artevea.com/casestudies-detail.php?type=case&id=10 |title=TETRA : Artevea Digital Limited : Digital Radio Communication |publisher=Artevea.com |access-date=2012-03-28 |archive-date=2012-03-02 |archive-url=https://web.archive.org/web/20120302194447/http://www.artevea.com/casestudies-detail.php?type=case&id=10 |url-status=live}}</ref>
| Transport
| In use
|-
| Motorola / [[Dimetra]]
| [[Hong Kong International Airport]] (HKIA)
| Transport
| In use since Feb 2009<ref>{{cite web |url=http://mediacenter.motorola.com/content/Detail.aspx?ReleaseID=10788&NewsAreaID=2 |title=Motorola Media Center - Press Releases - Motorola Completes Upgrade to TETRA Digital Radio System for Hong Kong International Airport |publisher=Mediacenter.motorola.com |access-date=2012-03-28 |archive-date=2012-03-21 |archive-url=https://web.archive.org/web/20120321225423/http://mediacenter.motorola.com/content/Detail.aspx?ReleaseID=10788&NewsAreaID=2 |url-status=live}}</ref>
|-
|Motorola
|[[CLP Power|CLP Power Hong Kong Limited]]
|Electric
|In use
|-
|
|[[Hongkong Electric Holdings Limited|Hongkong Electric Co., Limited]]
|Electric
|In use
|-
|
|[[Modern Terminals|Modern Terminals Limited]]
|Container port
|In use
|-
|
|[[Hongkong International Terminals|Hong Kong International Terminals Limited]]
|Container port
|In use
|-
|
|[[Hong Kong Liaison Office|Liaison Office of the Central People Government in the HKSAR]]
|Diplomacy
|In use
|-
| style="vertical-align:top;" rowspan="10"| India
|Artevea
|[[Military College of Telecommunication Engineering]] (MCTE)
| Indian Army
| In use since 2004 at Mhow, Indore, Madhya Pradesh
|-
| Motorola / [[Dimetra]]
|[[Delhi Metro Rail Corporation|Delhi Metro Rail Corporation Ltd]].
| Transport
| The First TETRA in India, in use since 2002
|-
| DAMM TetraFlex / [[Consort Digital Pvt Ltd]]
| Mumbai Mono Rail, Mumbai Metropolitan Region Development Authority (MMRDA)
| Mass transport - India's first monorail project - Mumbai
| Awarded 2010<ref>[http://www.damm.dk/news/1'st-monorail-project-in-india-awarded-to-damm.aspx 1st Monorail Project in India awarded to DAMM] {{Webarchive|url=https://archive.today/20130412101804/http://www.damm.dk/news/1'st-monorail-project-in-india-awarded-to-damm.aspx |date=2013-04-12}}. Damm.dk (2010-08-11). Retrieved on 2013-07-16.</ref>
|-
| C-DAC
| TETRA with Automatic Dial 100 (AD100)
| Kerala police
| In use by police, Trivandrum city, since 2008
|-
| DAMM TetraFlex / [[Consort Digital Pvt Ltd]]
|[[Tamil Nadu Police|Tamil Nadu police]]
| Police and internal security and safety
| Awarded 2011<ref>[http://www.damm.dk/news/tamil-nadu-police-chooses-damm-for-modern-control-rooms.aspx Tamil Nadu Police]. Damm.dk (2011-01-31). Retrieved on 2013-07-16.</ref>
|-
| HCL & Motorola
| Secure Communication Network
| Delhi government
| Integrated Communication System used by various departments under government of Delhi and Delhi police since 2010.
|-
| DAMM TetraFlex / [[Consort Digital Pvt Ltd]]
|[[GAIL|Gas Authority of India Limited]] (GAIL)
| Gas pipeline - safety, telemetry and security
| Awarded 2011<ref>[http://www.damm.dk/news/damm-chosen-to-provide-communication-for-gail-pipeline-in-india.aspx DAMM chosen to provide communication for GAIL pipeline in India]. Damm.dk (2011-07-12). Retrieved on 2013-07-16.</ref>
|-
| THALES Portugal S A & Motorola
| With PSTN call integration designed by [[Thales Group]] for [[BMRCL]]
| [[BMRCL]] Bangalore Metro Corporation Limited 
| Transport, in use since March 2011
|-
| Sepura & Rohde and Schwarz
| TETRA with Automatic Dial 100 (AD100)
| Gurgaon police
| In use by police, Gurgaon city<ref>{{cite web |url=http://www.indiaprwire.com/pressrelease/telecommunications/2009022220184.htm |title=Gurgaon Police goes Hi-Tech |access-date=2013-01-14 |archive-date=2012-09-11 |archive-url=https://web.archive.org/web/20120911072311/http://www.indiaprwire.com/pressrelease/telecommunications/2009022220184.htm |url-status=live}}</ref> Since 2009. In Salem from August 2011.
|-
| Sepura & Rohde and Schwarz
| TETRA with Automatic Dial 100 (AD100)
| Faridabad police
| In use by police, Faridabad city, since 2012
|-
| rowspan="3" style="vertical-align:top;" | Indonesia
| Motorola / [[Dimetra]], installed & maintained by [[PT. Mobilkom Telekomindo]]
| SCADA PT. Chevron Pacific Indonesia
| HOOU
| In use since 2009 at Duri, Riau, Indonesia.
|-
|Rohde & Schwarz / Accessnet - T
|Anti Corruption Agency
|Anti Corruption Agency
|Operational
|-
| [[Rohde & Schwarz]] / Accessnet-T
| Jakarta State Government Network
| Jakarta Capital City [[Jakarta]]
| Operational, Installed since 2007
|-
| style="vertical-align:top;" rowspan="2"| Macao
| Artevea
| Melco-Crown Entertainment
| Casino-Hotels: Altira (formerly Crown Macau),<ref>{{cite web |url=http://www.artevea.com/casestudies-detail.php?type=case&id=12 |title=TETRA : Artevea Digital Limited : Digital Radio Communication |publisher=Artevea.com |access-date=2012-03-28 |archive-date=2012-03-02 |archive-url=https://web.archive.org/web/20120302194713/http://www.artevea.com/casestudies-detail.php?type=case&id=12 |url-status=live}}</ref> and City of Dreams
| In use since 2007
|-
| Motorola / [[Dimetra]]
| Forças de Segurança de Macau
| All emergency services
| In use
|-
| style="vertical-align:top;" rowspan="3"| Malaysia
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| Segi Maju (SEGI)
| Public operator
| In use<ref>{{cite web|url=http://mis-asia.com/resource/networking/launch-of-digital-trunked-radio-service-in-malaysia/|title=Launch of digital trunked radio service in Malaysia|website=mis-asia.com|access-date=2013-09-02|archive-date=2014-12-06|archive-url=https://web.archive.org/web/20141206204523/http://mis-asia.com/resource/networking/launch-of-digital-trunked-radio-service-in-malaysia/|url-status=dead}}</ref>
|-
| Motorola / [[Dimetra]]
|[[Sungai Buloh–Kajang line]].
| Transport
| In use<ref>{{cite web|url=https://www.railway-technology.com/news/motorola-supply-tetra-network-malaysian-rail-project/|title=Motorola to supply TETRA network for Malaysian rail project|date=8 February 2018|access-date=7 January 2020|archive-date=21 September 2019|archive-url=https://web.archive.org/web/20190921030331/https://www.railway-technology.com/news/motorola-supply-tetra-network-malaysian-rail-project/|url-status=live}}</ref>
|-
| Motorola / [[Dimetra]]
|[[Sungai Buloh–Serdang–Putrajaya line]].
| Transport
| Operational 2021
|-
|Maldives
| Motorola / [[Dimetra]]
|[[Maldives Police Service]] (MPS)
| Police
| In use
|-
| Pakistan
| Motorola / Dimetra
| NITRS Nationwide Integrated Trunk Radio System Project for Police under Ministry of Interior, Government of Pakistan
| Police
| In use Since 2009
|-
| style="vertical-align:top;" rowspan="4"| Philippines
| Motorola Dimetra/GA Technology and Systems Inc.
| Shell Exploration
| Oil and gas
| In use October 2013, Phase 2 On Shore Gas Plant for Implementation 
|-
| Motorola Dimetra/GA Technology and Systems Inc.
|[[Globe Telecom]]
| Telecommunications carrier
| Implementation on Going Project Finish Dec 2013
|-
| Rohill (TetraNode) SynTech Systems Inc.
|[[Meralco]]
| Electric company
| Implemented Nov 2014
|-
| Rohill (TetraNode) SynTech Systems Inc.
| Manila Line 2
| Transport (Manila Light Rail Transit System Line 2)
| Implemented Oct 2015
|-
| South Korea 
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
|[[Korea Electric Power Corporation]] (KEPCO)
|Electricity
|In use<ref>{{Cite web|url=http://www.tetramou.com/tetramou.aspx?ID=6716|archiveurl=https://web.archive.org/web/20101130172334/http://www.tetramou.com/tetramou.aspx?ID=6716|url-status=dead|title=TETRA Association|archivedate=November 30, 2010}}</ref>
|-
| style="vertical-align:top;" rowspan="5"|Taiwan
| 
|[[Taiwan Railways Administration]]
|Transport
|In use
|-
| 
|[[Taiwan High Speed Rail]]
|Transport
|In use
|-
| 
|[[Taipei Metro]]
|Transport
|In use
|-
| 
|[[Kaohsiung Rapid Transit|Kaohsiung Mass Rapid Transit]]
|Transport
|In use
|-
| 
|[[Coast Guard Administration (Taiwan)|Coast Guard Administration]] (Taiwan)
|Republic of China Armed Forces
|In use
|-
| rowspan="18" style="vertical-align:top;" | Africa
| rowspan="2" | Algeria
| Rohde & Schwarz
|[[Sonatrach]]
| Oil & gas company
| In use since 2003.
|-
| Sepura
|[[Sonelgaz]]
| Power utility
| In use.
|-
| Morocco
| Rohill
| [[Société Nationale des Autoroutes du Maroc|ADM]]
| Highway authority 
| Rolling out / Almost completed.
|-
| style="vertical-align:top;" rowspan="6"| Nigeria
| Dizengoff/Motorola IL (Dimetra IP)
|[[Nigeria LNG]]
| Nigeria LNG|Oil & gas
| Since 2006
|-
| Cisan International Limited/Rohill (TetraNode)
|[[Mobil Nigeria oil spill|Mobil Ng]]
| Mobila Ng| Oil
| Since 2014
|-
| Dizengoff/Motorola IL (Compact-Tetra IP)
|[[Shell Nigeria|Shell Ng]]
| Shell Ng| Oil
| Since 2010
|-
| Satcomm Integrated Resources LLC SatCom IRL/EADS
| <ref>{{Cite web |url=http://www.satcomng.com/index.php#.UYo6j8omzdI |title=SatCom IRL &#124; Homepage |access-date=2013-05-08 |archive-url=https://web.archive.org/web/20130323032258/http://satcomng.com/index.php#.UYo6j8omzdI |archive-date=2013-03-23 |url-status=dead}}</ref>
| Nigerian Ports Authority, Nigeria (rolling out)
| Rolling out
|-
| Rohill (TetraNode)
|[[Bayelsa State]]
| Government
| Since June 2012
|-
| Briscoe Technologies<ref>{{cite web|url=http://www.briscoetechnologies.com/|title=Hyperlinks|website=www.briscoetechnologies.com|access-date=2012-08-24|archive-date=2012-08-24|archive-url=https://web.archive.org/web/20120824142635/http://www.briscoetechnologies.com/|url-status=live}}</ref> / Hytera Accessnet
| Lagos / Abuja / Port Harcourt
| Oil industry / airports / security companies
| In use Since 2006
|-

| Namibia
| [[Artevea]]
|[[Namibian Police Force]]<ref>{{cite web |url=http://www.artevea.com/casestudies-detail.php?type=case&id=14 |title=TETRA : Artevea Digital Limited : Digital Radio Communication |publisher=Artevea.com |access-date=2012-03-28 |archive-date=2012-07-28 |archive-url=https://archive.today/20120728152336/http://www.artevea.com/casestudies-detail.php?type=case&id=14 |url-status=live}}</ref>
| Police
| In use, nationwide
|-
| style="vertical-align:top;" rowspan="6"| South Africa 
| Motorola Solutions DIMETRA 
| Police, traffic police
| SAPS Gauteng
| Gauteng province
|-
| Motorola Solutions DIMETRA
| Municipality, fire, and ambulance.
| City of Cape Town
| Cape Peninsula
|-
| Rohill (TetraNode)
|[[Mbombela Local Municipality]]
| Nelspruit, Mpumalanga
| Complete
|-
| Rohill (TetraNode)
| City Power
| Johannesburg, Gauteng
| Complete
|-
| Rohill (TetraNode)
| City of Tshwane Municipality
| Pretoria, Gauteng
| Complete
|-
| Rohill (TetraNode)
| Rustenburg Platinum Mine
| Potgietersrus, Limpopo
| Complete
|-
| Sudan
| [[Artevea]]
| Ministry of Interior
| Police
|In use, nationwide
|-
|Egypt
|Motorolasolutions 
Dimetra IP
|MERC
|Ministry of Interior, Suez Canal Authority, Oil& GAS and commercial users
|In use, Nationwide
|-
| rowspan="64" style="vertical-align:top;" | Europe
| Austria
| Motorola / [[Dimetra]]
| [[:de:TETRON|TETRON]]
| Police, fire, ambulance, and local train company.
| In use, in all states except Tyrol and Vorarlberg (still rolling out).
|-
| style="vertical-align:top;" rowspan="2"| Belgium
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]/Since 1998
| [[:nl:A.S.T.R.I.D.]] [[:fr:A.S.T.R.I.D.]]
| Police, fire, ambulance, customs, coast guard, hospitals, Red Cross, department of Justice, utility companies, airports, ports, lifeguard service, military.
| Nationwide network
|-
| Rohde & Schwarz since 2011/ ACCESSNET-T
| ENTROPIA DIGITAL
| Commercial & private security users.<ref name="entropia.eu">{{cite web|url=http://www.entropia.eu|title=Entropia – Critical concepts|website=www.entropia.eu}}</ref>
| Flanders & Brussels
|-
| style="vertical-align:top;" rowspan="1"| Croatia
| Motorola / [[Dimetra]]
| MUPNet
| Police, fire brigades, ambulance service
| Nationwide coverage (99,5%) in use
|-
| style="vertical-align:top;" rowspan="2"|Denmark
| DAMM TetraFlex
| DONG Energy Power Plants - 11 Power Plants across Denmark
| Utilities - safety, security, telemetry
| Awarded 2009<ref>[http://www.damm.dk/news/damm-supplies-safe-tetra-communication-for-dong-energy-power-plants.aspx DAMM supplies safe TETRA communication for DONG Energy Power Plants]. Damm.dk (2009-09-02). Retrieved on 2013-07-16.</ref>
|-
| Motorola / [[Dimetra]]
| SINE<ref>{{Cite web |url=http://www.sikkerhedsnet.dk/about+sine |title=SINE - About SINE |access-date=2012-02-23 |archive-url=https://web.archive.org/web/20120427104955/http://www.sikkerhedsnet.dk/about+sine |archive-date=2012-04-27 |url-status=dead}}</ref>
| All emergency authorities, incl. police, fire, and ambulance.
| Nationwide coverage (99,5%) in use
|-
| Estonia
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| ESTER
| Police and border guard, fire, ambulance, and customs
| Nationwide network
|-
| style="vertical-align:top;" rowspan="2"| Finland
| Nokia; now [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[VIRVE]]
| Police, fire, ambulance, customs, defence forces, and border guard
| Nationwide network
|-
|
| HelenNet
| Energy company [[Helsingin energia|Helsingin Energia]], tram operator [[Helsinki City Transport|HKL-Raitioliikenne]], and several bus operators on [[Helsingin seudun liikenne|HRTA's]] lines. Also used by some security guard companies, mostly securing HRTA's transport. Available for lease for various short-term uses.
| In use, covers greater Helsinki region
|-
| rowspan="3" style="vertical-align:top;" | Germany
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[:de:BOSNET|BOSNET]]
| Police, fire, ambulance, customs, and coast guard.
| Nationwide
|-
| DAMM TetraFlex
| Global Tech 1 Offshore Wind GmbH.
| Utility Windfarm - Telemetry, Security and Safety Critical communications
| Awarded 2012<ref>[http://www.damm.dk/news/global-tech-1-offshore-wind-farm-relies-on-damm-infrastructure.aspx Global Tech 1 Offshore Wind farm relies on DAMM Infrastructure]. Damm.dk (2012-08-27). Retrieved on 2013-07-16.</ref>
|-
| style="vertical-align: top;" |Hytera
|[[Bremer Straßenbahn|Bremen Tramway]]
|Transport
|In use since 2018
|-
| Greece
| Motorola / Dimetra
| COSM[[OTE]] TETRA Services <br /> Formerly branded OTElink (2009).
| Business critical, public protection & disaster relief (PPDR) communications, public utility and oil-gas companies, seaports, airports, public and private transportation companies, public and private sector security personnel, other. Data applications nationwide including SCADA, AVL, M2M. 
| Extensive nationwide footprint,<br />70% population coverage in 2014, in use since 2002
|-
|
|SEPURA
|Teltronic
|Police, Fire Services, Coast Guard
|Nationwide roll-out in progress.
|-
| Hungary
| Pro-M Ltd.
| EDR (acronym for Unified Digital Radiosystem)
| Ambulance, army, Central Office for Administrative and Electronic Public Services, Civil Defence, Hungarian Prison Service, Hungarian Customs and Finance Guard, disaster management, fire, Hungarian Secret Services, Ministry of Environment and Water, and police
| In-use
|-
| Iceland
|Motorola / [[Dimetra]]
| TETRA Iceland
| Police, fire services, ambulances, Search and Rescue units, Red Cross, bus service (Strætó Bs.), The Icelandic National Broadcasting Service, most utility companies, municipalities and private users such as excursion companies. 
| In-use
|-
| Ireland
| Motorola / [[Dimetra]]
| TETRA Ireland
| An Garda Siochana, HSE National Ambulance Service, Irish Prison Service, Irish Naval Service, Customs & Excise, civil defense (only a few units), Irish Coast Guard, mountain rescue (only a few units), Order of Malta Ambulance Corps, Irish Red Cross, St John Ambulance, National Emergency Office, Port of Cork, Revenue Commissioners and Office of Public Works.
| Nationwide roll-out network complete. The fire services are planning to implement in the coming years. As of July 2011, TETRA Ireland now operates the national Paging System.
|-
| style="vertical-align:top;" rowspan="3"|Italy
| DAMM TetraFlex
| Lombardi Ambulance Emergency Services
| Ambulance - security, safety, communication
| Awarded 2010<ref>[http://www.damm.dk/news/public-safety-in-lodi,-italy.aspx TetraFlex for Public Safety in Lodi, Italy]. Damm.dk (2010-02-02). Retrieved on 2013-07-16.</ref>
|-
| SELEX ELSAG
| Rete Interpolizie
|Polizia di Stato (Italian state police), Carabinieri (military police), Guardia di Finanza (financial police), Polizia Penitenziaria (prison police), and Corpo Forestale Italiano (Italian forest brigades)
| Rolling out
|-
| DAMM TetraFlex
|Rome International Airport
| Airport - security, safety, commercial, fire, customs, police
| Awarded 2009<ref>[http://www.damm.dk/news/rome-international-airport-chooses-damm-as-supplier-for-mission-critical-communication.aspx Rome International Airport chooses DAMM as supplier for Mission Critical Communication]. Damm.dk (2009-09-14). Retrieved on 2013-07-16.</ref>
|-
| rowspan="3" | Latvia
| [[Artevea]]
| Ventamonjaks Serviss Ltd, Ventspils<ref><nowiki>{{cite web|url=</nowiki>http://www.artevea.com/casestudies-detail.php?type=case&id=11 {{Webarchive|url=https://web.archive.org/web/20120302194727/http://www.artevea.com/casestudies-detail.php?type=case&id=11 |date=2012-03-02}} |title=TETRA : Artevea Digital Limited <nowiki>: Digital Radio Communication |publisher=Artevea.com |access-date=2012-03-28}}</nowiki></ref>
| Oil and gas
| In use since 2007
|-
|Motorola / [[Dimetra]] (SIA DAN Communications)
|[[:lv:Rīgas pašvaldības policija|Riga Municipal Police]]<ref>{{Cite web|title=TETRA system for the Riga Municipal Police / DAN Communications|url=http://www.dan.lv/en/solutions/public-safety/tetra-municipality/|access-date=2020-06-21|website=www.dan.lv}}</ref>
|Local law enforcement in [[Riga]]
|Ordered in 2016<ref>{{Cite web|title=Paziņojums par līgumu RPP 2016/31 "Par radiosakaru sistēmas uzturēšanu, tehnisko atbalstu un remontu"|url=https://rpp.riga.lv/procurement-list/pazinojums-par-ligumu-rpp-2016-31-par-radiosakaru-sistemas-uzturesanu-tehnisko-atbalstu-un-remontu/|access-date=2020-06-21|website=Rīgas pašvaldības policija|language=lv|archive-date=2020-09-26|archive-url=https://web.archive.org/web/20200926053948/https://rpp.riga.lv/procurement-list/pazinojums-par-ligumu-rpp-2016-31-par-radiosakaru-sistemas-uzturesanu-tehnisko-atbalstu-un-remontu/|url-status=live}}</ref>
|-
|Motorola / [[Dimetra]] (SIA DAN Communications)
|[[State Police (Latvia)|State Police]]<ref>{{Cite web|title=DAN COMMUNICATIONS, SIA|url=https://www.prakse.lv/en/enterprise/profile/4502/dan-communications-sia|access-date=2020-06-21|website=Prakse.lv}}</ref>
|National law enforcement
|
|-
| style="vertical-align:top;" rowspan="4"| Luxembourg
| Motorola / [[Dimetra]]
| Renita<ref>{{cite web|url=http://www.renita.lu|title=Page Redirection|website=www.renita.lu}}</ref>
| Government; police, fire brigade, ambulance services and others
| Start building 2014, Operational since 2015
|-
| Motorola / [[Dimetra]]
| ConnectCom<ref name="connectcom.lu">{{cite web|url=http://www.connectcom.lu/|title=Radiocommunication sur mesure|first=CMS|last=Sefrengo|website=www.connectcom.lu|access-date=2014-11-22|archive-date=2014-12-16|archive-url=https://web.archive.org/web/20141216223238/http://connectcom.lu/|url-status=live}}</ref>
| Commercial network
| Operational
|-
| Motorola / [[Dimetra]]
| ConnectCom<ref name="connectcom.lu"/>
| Public Transport, city of Luxembourg
| Operational
|-
| Motorola / [[Dimetra]]
| ConnectCom<ref name="connectcom.lu"/>
| European Union
| Operational
|-
|North Macedonia
|Hytera
|Fire brigade of city Skopje
|Fire department
|In use
|-
| Malta
| Marconi
| 
| Civil Protection Force{{citation needed|date=February 2020}}
| July 2001
|-
| Monaco
| Motorola
|
| Sûreté Publique (Police), Carabiniers (military police), fire brigades, ambulance
| Nationwide coverage (including indoor public buildings)
|-
| Montenegro
| Motorola / [[Dimetra]]
| Wireless Montenegro d.o.o.
| Police, military, fire brigades, ambulance
| In use since November 2012 Podgorica area only. Rolling out elsewhere.
|-
| style="vertical-align:top;" rowspan="7"| Netherlands
| Motorola / [[Dimetra]] until 2019, Hytera / AccessNet-T since 2019
| C2000<ref>{{cite web|url=http://www.c2000.nl/|title=MDC|website=www.c2000.nl|access-date=2014-11-22|archive-date=2006-06-29|archive-url=https://web.archive.org/web/20060629092343/http://www.c2000.nl/|url-status=live}}</ref>
| Police, fire, and ambulance
| Nationwide network
|-
| Motorola / [[Dimetra]]
| ENTROPIA DIGITAL
| Commercial users.<ref name="entropia.eu"/>
| National license
|-
| Motorola / [[Dimetra]] until 2019 ?, Hytera AccessNet-T since 2019 ??
| [[HTM Personenvervoer|HTM]]
| Public transport The Hague
| Regional network
|-
| Motorola / [[Dimetra]]
| CCTN / [[Gemeentelijk Vervoerbedrijf|GVB]]
| Public transport Amsterdam
| Regional network
|-
| Rohill
| [[Rotterdamse Elektrische Tram|RET]]
| Public transport Rotterdam
| Regional network
|-
| Rohill
| Schiphol Airport
| Schiphol Group, KLM, and other businesses
| Local network
|-
| Sepura
| TATA steel Europe
| Hoogovens
| Local network
|-
| Norway
| Motorola / [[Dimetra]]
| [[Norwegian Public Safety Radio]]
| Police, fire, ambulance, civil defense and search and rescue
| Nationwide rollout completed September 2015
|-
|
|Motorola
|Ruter/Sporveien
|Public Transport, Oslo
|Established before 2003
|-
| rowspan="2" | Portugal
| Motorola
| [[SIRESP]]
| Police (PSP and GNR), fire, ambulance and civil protection
| Nationwide roll-out, in use since 2007
|-
|Motorola
|Lisbon International Airport (LPPT)
|Transport - Ground operations
|Local Network
|-
| style="vertical-align:top;" rowspan="2"| Poland
| Motorola
| Ministry of Interior, Polish army, and Warsaw police
| Police, fire, public transport, airports, and army.<ref>{{cite web|url=https://tetraforum.pl/10-years-of-tetra-in-poland/ |title=TETRA Forum Poland |date=26 November 2010 |publisher=Tetraforum.pl |access-date=2020-06-08}}</ref>
| Local TETRA Networks in use since 2000; national roll-out expected to start in 2011.
|-
| Rohill (TetraNode)
| Szczecin, Warsaw and Kraków police
| Roll-out ongoing.
| Modern IP based TETRA solution for 3 cities 
|-
| style="vertical-align:top;" rowspan="3"| Romania
| Motorola / [[Dimetra]]
| Special Telecommunications Service (STS)
| Police, fire, and search and rescue
| Nationwide
|-
| Motorola 
| [[Dimetra]]
| Ministry of Administration and Interior (MAI) / Romanian Border Police (RBP)
| In use since 2008 for police, emergency and search and rescue agencies from Romanian border counties-wide
|-
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| TETRA EADS
| Ministry of Administration and Interior (MAI) / Romanian Border Police (RBP)
| In use since 2010 for police, emergency and search and rescue agencies from Romanian border counties-wide
|-
|
|Hytera/Motorola/Sepura
|HamTetra Network Romania
|Amateur radio users engage in both DMO (Direct Mode Operation) and TMO (Trunked Mode Operation) modes, both within the country and globally, connecting through gateways such as Zello and SVXLink.
Ham Tetra Romania Network Architecture was developed and published along with users map and equipment used on the YO8TEH website
|Tetra gear in ham radio was initially introduced by YO8TEH in 2014 in DMO (Direct Mode Operation). Subsequently, it evolved into gateways through platforms like Zello and Teamspeak. In 2021, a part of the system was split and migrated to svxlink, along with its classic application. The first Tetra Repeater for Ham Radio use in Romania was licensed under the call sign YO8TEH-1, while the second TMO repeater was licensed under the call sign YO8Q.
|-
| style="vertical-align:top;" rowspan="4"| Russia
| DAMM TetraFlex
| Moscow Metro (second most heavily used rapid transport system in the world) 
| Transport - rail - telemetry, safety, security, police, ambulance, fire
| Awarded 2011<ref>[http://www.damm.dk/news/damm-provides-enhanced-safety-for-moscow-metro.aspx Moscow Metro]. Damm.dk (2011-01-04). Retrieved on 2013-07-16.</ref>
|-
| Sepura
| Unified system of operational trunking radio (Единая Система Оперативной Транкинговой Радиосвязи)
| Fire, ambulance and partially, police
| Launched in 2008
|-
| DAMM TetraFlex
| Russias Kaliningrad Power Plant.
| Utility power plant - safety and security - telemetry and commercial agents 
| Awarded 2009<ref>[http://www.damm.dk/news/kaliningrad-biggest-power-plant-chooses-damm%E2%80%99s-tetraflex%C2%AE-system-for-safety-reasons-.aspx Kaliningrad biggest Power Plant chooses DAMM's TetraFlex system for safety reasons] {{Webarchive|url=https://archive.today/20130412102457/http://www.damm.dk/news/kaliningrad-biggest-power-plant-chooses-damm%E2%80%99s-tetraflex%C2%AE-system-for-safety-reasons-.aspx |date=2013-04-12}}. Damm.dk (2009-10-01). Retrieved on 2013-07-16.</ref>
|-
| DAMM TetraFlex
| St Petersburg and North West Russia.
| Government - ambulance and emergency services, police, healthcare facilities, utility services, St. Petersburg Authorities and the regional civil defense 
| Awarded 2011<ref>[http://www.damm.dk/news/damm-deployed-for-regional-network-in-north-west-russia.aspx DAMM deployed for regional network in North West Russia]. Damm.dk (2011-08-22). Retrieved on 2013-07-16.</ref>
|-
| Serbia
| Motorola / [[Dimetra]]
| Ministry of Interior
| Police, fire brigades, ambulance
| Fully rolled out as of 2009
|-
| Slovenia
| Selex/OTE/Marconi
| Ministry of Interior
| Police
| In central Slovenia
|-
| style="vertical-align:top;" rowspan="3"| Spain
| Motorola
| [[Basque Country (autonomous community)|Basque Country]]
| Mainly police
| In use since 2006
|-
| Teltronic
| [[Basque Country (autonomous community)|Basque Country]]
| Mainly municipalities and public services
| In use since 2009
|-
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[Catalonia]]
| Police, fire brigades, civil protection, ambulances, forest guards, water agency, gas company, road maintenance service and other public agencies
| In use since 2006
|-
| style="vertical-align:top;" rowspan="3"| Sweden
| SAAB, Cassidian, Eltel Networks
| RAKEL
| Managed by the Civil Contingencies Agency - MSB. For use by the emergency services and others in the fields of civil protection, public safety and security, emergency medical services and healthcare, road services, nuclear facilities.
| In operation, covering 99.8% of Sweden's population and 95% of its territory
|-
| Motorola
| Tetra
| Stockholm public transport: used by transport security officers for dispatch internal communications, Transport Police ("Tunnelbanepolisen") and other police forces for liaison with transport officials. Roll-out stage for train operations on underground.
| In operation / roll-out
|-
| Rohde & Schwarz
| [[Got1]]
| Got1 is a modern IP based Tetra network used in the west parts of Sweden. Mainly in the Gothenburg region. With customers like SKF and Volvo Trucks.
| In operation
|-
| style="vertical-align:top;" rowspan="4"| United Kingdom
| Motorola / [[Dimetra]] / [[Sepura]] 
| [[Airwave Solutions|Airwave]]
| Police, fire, [[National Health Service|NHS]] ambulance services, Border Force, immigration enforcement, some armed forces, [[National Highways traffic officer]]s, civil contingency services, [[HM Coastguard]], [[St John Ambulance in England|St John Ambulance]], [[St John Ambulance in Wales|St John Cymru]], [[British Red Cross]], [[Highland Council]], and miscellaneous emergency services.
| Full emergency service rollout complete
|-
| Hytera
| Tetra
| [[Her Majesty's Prison Service|Prison Service]]
| Operational
|-
| Motorola / [[Dimetra]]
| [[Transport for London#Connect project|Connect]]
| [[Transport for London]] ([[London Underground]])
| Used by all [[London Underground|Tube]] staff and relaying [[Airwave Solutions|Airwave]] for [[British Transport Police|BTP]] when underground
|-
|AirRadio AR-en
|
|Use by some services at some major airports
|(Heathrow, Birmingham, Manchester, Glasgow, Aberdeen)
|-
| style="vertical-align:top;" rowspan="5"| Middle East
| Israel
| Motorola<ref>{{cite web |url=http://www.sibat.mod.gov.il/NR/rdonlyres/46327BB3-3E46-42E7-B459-ACA055C6F97D/0/sod_motorolad_dsd_.pdf |title=Wide Area Military Voice & Data Infrastructure Solutions based on COTS technology |access-date=2012-03-28 |archive-date=2012-03-15 |archive-url=https://web.archive.org/web/20120315180027/http://www.sibat.mod.gov.il/NR/rdonlyres/46327BB3-3E46-42E7-B459-ACA055C6F97D/0/sod_motorolad_dsd_.pdf |url-status=live}}</ref>
| Mountain Rose
| Israel Defense Forces (IDF)
| In use by IDF, country-wide
|-
| Turkey
| DAMM TetraFlex
| Alacer Gold Mine
| Mining - safety and security critical communications
| Awarded 2012<ref>[http://www.damm.dk/news/damm's-tetraflex(r)-chosen-for-alacer-gold-mining-operation.aspx DAMM's TetraFlex® chosen for Alacer Gold Mining operation] {{Webarchive|url=https://web.archive.org/web/20130828175143/http://www.damm.dk/news/damm%27s-tetraflex%28r%29-chosen-for-alacer-gold-mining-operation.aspx |date=2013-08-28}}. Damm.dk (2012-11-05). Retrieved on 2013-07-16.</ref>
|-
| style="vertical-align:top;" rowspan="2"| United Arab Emirates
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[Nedaa]]
| Police, emergency services, and professional communications
| [[Dubai]], [[Sharjah (emirate)|Sharjah]], [[Ajman]], [[Umm Al-Qaiwain]], [[Ras Al-Khaimah]], and [[Fujairah]] operational
|-
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
| [[Polikom]]
| Police, emergency services, and professional communications
| [[Abu Dhabi]]
|-
| Qatar
| [[Airbus Defence and Space|EADS/Cassidian/Airbus]]
|
| Ministry of Interior, army, police, air force search and rescue, EMS (medical).
| Initial use for the 15th Asian Games all games venues inclusive of transportation routes for "blue light" services, later extended to cover the State of Qatar, in use since 2006, national roll out complete by 2008. Known as Qatar Secure TETRA Radio System (QSTRS).
|-
| Latin America
| [[Mexico]]
| Rohde & Schwarz / Sepura
| [[Mazatlán, Sinaloa]] Police & Emergency Services
| Police, emergency services operational
|Operational
|-
| rowspan="3" | [[South America]]
| rowspan="3" | [[Brazil]]<ref>{{cite web|url=https://radioamador.files.wordpress.com/2012/04/revista.pdf|title=Builds Tetra Network in Brazil by Dr. Cristiano Torres do Amaral from Brazilian Police Academy|access-date=4 March 2020|archive-date=13 May 2021|archive-url=https://web.archive.org/web/20210513095945/https://radioamador.files.wordpress.com/2012/04/revista.pdf|url-status=live}}</ref>
| [[Motorola]]
| [[América Latina Logística]] 
| Railroad, communication and licensing.
|Operational
|-
|Teltronic / Motorola
|[[Polícia Rodoviária Federal]]
|Road patrol, country-wide
|In operation / national roll-out in progress
|-
|Teltronic / Motorola
|12 states<ref>{{cite web|url=https://archive.today/https://www.digitalsecuritymagazine.com/pt/2018/05/11/tecnologia-espanola-teltronic-suma-a-red-nacional-tetra-desplegada-en-brasil-otro-estado/|access-date=1 Jan 2023|title=Tecnologia espanhola da Teltronic adiciona mais um estado à rede nacional TETRA implantada no Brasil}}</ref>
|Public Safety Agencies
|In operation, 600+ stationary stations.
|-
| rowspan="2" style="vertical-align:top;" | Caribbean
| style="vertical-align:top;"| [[Windward Islands]] and [[Leeward Islands]]
| Rohill
| Zenitel, C3 since 2005
| Police, emergency services, oil and professional communications
| [[Aruba]], [[Bonaire]], [[Curaçao]], [[Sint Maarten]], [[Collectivity of Saint Martin|Saint Martin]], [[Saba (island)|Saba]], [[Sint Eustatius]], and [[Anguilla]] operational
|-
|Dominican Republic
|Hytera
|Metro of Santo Domingo, and 
National Emergency and Safety System 9-1-1
|Metro: railroad communication, telemetry and PLC.

911: technical and power systems support communication, operations and dispatching, service agencies communication systems (police, Public health, firefighters, traffic control authority, road support).
|Metro: First line operation started in 2008. 2nd line operation started 2013. 2nd line expansion (L2B) started in 2014 and started operation on August 8, 2018.

911: Operation started in 2014 in Santo Domingo, with expansions in 2015. In 2016, TETRA trunking radio expanded to Haina and San Cristobal, cities in the southwest of Santo Domingo. In 2017, the service expansion of 911 services using TETRA expanded to the north of the country, to cover large cities as Santiago, Puerto Plata and small villages. On August 3, 2018, service expanded to the province Peravia (West to the Capital) and on August 28, 2018, it started in the province of San Pedro de Macoris  ( East to the capital). 
|-
| rowspan="17" style="vertical-align:top;" | Oceania
| rowspan="13" style="vertical-align:top;" | [[Australia]]
| DAMM TetraFlex
| BHP Billiton
| Temco Smeltering Tasmania - mining, commercial, safety, security
| Awarded 2011
|-
| DAMM TetraFlex
| Rio Tinto
| Western Australia Mining
| Awarded 2009<ref>[http://www.damm.dk/news/rio-tinto-mining-group-continues-to-deploy-damm%E2%80%99s-tetraflex%C2%AE.aspx Rio Tinto Mining Group continues to deploy DAMM's TetraFlex] {{Webarchive|url=https://archive.today/20130412101905/http://www.damm.dk/news/rio-tinto-mining-group-continues-to-deploy-damm%E2%80%99s-tetraflex%C2%AE.aspx |date=2013-04-12}}. Damm.dk (2009-08-03). Retrieved on 2013-07-16.</ref>
|-
|Rohill Tetra
|Inpex
|Ichthys LNG
|Infrastructure
|-
|Rohill Tetra
|BHP Billiton
|Macedon Gas
|Infrastructure
|-
| DAMM TetraFlex
| Origin Energy (APLNG)<ref>{{cite web |url=http://www.kordia.com.au/LiteratureRetrieve.aspx?ID=130443 |title=Archived copy |access-date=2014-02-13 |url-status=dead |archive-url=https://web.archive.org/web/20140212225330/http://www.kordia.com.au/LiteratureRetrieve.aspx?ID=130443 |archive-date=2014-02-12}}</ref>
| Kordia Solutions
| Australian Pacific Project
|-
|Rohill Tetra
|Goldlinq
|Goldcoast rail
|Goldcoast infrastructure
|-
| DAMM TetraFlex
| Fortescue Metals group
| Open cut mining
| Awarded 2011<ref>[http://www.damm.dk/news/fortescue-metals-group-ltd-deploy-damm.aspx Fortescue Metals Group Ltd deploy DAMM]. Damm.dk (2011-03-18). Retrieved on 2013-07-16.</ref>
|-
| DAMM TetraFlex
| Gorgon LNG Project, Chevron, Australia
| Gas and pipelines
| Awarded 2011<ref>[http://www.damm.dk/news/world%E2%80%99s-largest-lng-project-to-roll-out-damm%E2%80%99s-tetraflex%C2%AE.aspx World's largest LNG project to roll-out DAMM's TetraFlex®] {{Webarchive|url=https://archive.today/20130412101822/http://www.damm.dk/news/world%E2%80%99s-largest-lng-project-to-roll-out-damm%E2%80%99s-tetraflex%C2%AE.aspx |date=2013-04-12}}. Damm.dk (2010-04-26). Retrieved on 2013-07-16.</ref>
|-
|Motorola
|BHP Billiton
|Pyrenees FPSO
|Awarded 2016
|-
| [[Motorola]]
| Zeon
| Local government
| Operational across [[Brisbane City Council]], including the Brisbane State Emergency Service Unit
|-
| DAMM TetraFlex
| Australian Submarine Co
| Military, defence, comms, safety, security
| Awarded 2012
|-
| [[Motorola]]
| Zeon
| Tertiary education
| Used by [[Queensland University of Technology]] security staff.
|-
| [[Sepura]]
|
|
| Being used by several Mining Operations throughout Western Australia and Queensland - Terminals only - No Infrastructure.
|-
| style="vertical-align:top;" rowspan="4" | [[New Zealand]]
| DAMM TetraFlex
| BHP One Steel 
| Aluminium Smelter - ore production - safety, security, operations 
| Awarded 2012
|-
| [[Kordia]]
| KorKor
| Airports
| Used by [[Wellington International Airport]], [[Air New Zealand]]
|-
| [[Kordia]]
| KorKor
| Councils
| Used by [[Hutt City]], [[Auckland Transport]]
|-
| Teltronic
| Widarcom
| Commercial network launched 2008
| Used by University of Auckland, Westpac
|}

== Amateur radio usage ==
In the past decade, TETRA has seen an uptick in usage in the amateur radio community. The perceived higher audio quality compared to other digital voice modes, capacity for packet data, SDS, single frequency DMO repeaters, close proximity of the [[70-centimeter band|UHF (430-440MHz) amateur radio band]] and full duplex audio in TMO are motivating arguments to experiment contacts with this technology.

Multiple constraints have to be noted when using TETRA for amateur radio service:

* In most countries, encryption cannot be used.
* Most older (pre-2010) terminals don't cover the Region 1 amateur radio frequency range (430–440) natively, and must be modified via software with a possible impact on RF performance.<ref>{{Cite web |title=Tetra Ham Documents {{!}} Stichting Telekom Techniek Arnhem |url=https://www.pi4tta.nl/tetra-ham-documents/ |access-date=2024-07-10 |language=nl |archive-date=2024-07-10 |archive-url=https://web.archive.org/web/20240710105134/https://www.pi4tta.nl/tetra-ham-documents/ |url-status=live}}</ref>

Multiple amateur DMO<ref>{{Cite web |date=10 July 2024 |title=Tetra SVXLink dashboard |url=http://leipzig2000.dyndns.org:4047/ |access-date=10 July 2024 |archive-date=10 July 2024 |archive-url=https://web.archive.org/web/20240710083609/http://leipzig2000.dyndns.org:4047/ |url-status=live}}</ref> and TMO<ref>{{Cite web |date=10 July 2024 |title=Tetrapack Map |url=http://map.tetrapack.online}}</ref> networks are established throughout Europe.

Additionally, an open-source project aims to create a complete SDR-based TETRA stack, with a working DMO repeater proof of concept.<ref>{{Citation |title=rats-ry/HamTetra |date=2024-06-11 |url=https://github.com/rats-ry/HamTetra |access-date=2024-07-10 |publisher=Radioamatööritekniikan seura r.y.}}</ref>

== See also ==
* [[Digital mobile radio]], a TDMA digital radio standard from ETSI
* [[Digital private mobile radio]] (dPMR), an FDMA digital radio standard from ETSI
* [[NXDN]], a two-way FDMA digital radio protocol from Icom and JVC Kenwood
* [[Project 25|P25]] (Project 25), a [[Telecommunications Industry Association|TIA]] APCO standard (USA) 
* [[TETRAPOL]] (previously MATRA)

== References ==
{{Reflist|30em}}

== External links ==
* [https://www.etsi.org/technologies/tetra ETSI's website with free access to TETRA standards] 
* [http://www.hamtetra.com HamTetra Community Resources]
* [http://webarchive.nationalarchives.gov.uk/20090121211751/http://police.homeoffice.gov.uk/publications/operational-policing/tetra-dstl-final-report/ Report on the health effects of TETRA] prepared for the [[Home Office]]
* [http://www.digitalradiohacker.co.uk/home TETRA in use by radio amateurs]
* [https://tcca.info The Critical Communications Association]
* [https://www.itu.int/pub/R-REP-M.2377/en Radiocommunication objectives and requirements for Public Protection and Disaster Relief (PPDR)]

{{Digital PMR standards}}
{{trunked radio systems}}
{{Authority control}}

[[Category:ETSI]]
[[Category:Trunked radio systems]]
[[Category:Mobile telecommunications standards]]
[[Category:Emergency communication]]
[[Category:Rail transport mobile telecommunications standards]]