Radio & Trunking Distributors professional services provide complete solutions for the design and implementation of radio trunking and microwave networks, as well as the expansion or integration of existing ones. RTD offers full turnkey solutions, as well as consulting, training maintenance and support.

 

Motorola - Dimetra Tetra Systems

Motorola is known around the world for innovation in communications and is focused on advancing the way the world connects. From broadband communications infrastructure, enterprise mobility and public safety solutions to high-definition video and mobile devices, Motorola is leading the next wave of innovations that enable people, enterprises and governments to be more connected and more mobile. Motorola (NYSE: MOT) had sales of US $30.1 billion in 2008.

 

 


Advanced mission critical solutions from the world’s largest supplier of TETRA solutions.

An efficient communication system is vital for mission critical users. Motorola offer a range of voice and data features that provide much faster call set up times than telephone systems and allow operational groups of users to communicate together on an all-informed basis, often coordinated by one or more dispatch operators.

Features offered range from basic group call, telephone interconnect and packet data capabilities to advanced features such as recent user priority, dynamic regrouping and site wide calls. Such services ensure the overall efficiency of Motorola’s solution.

 

Dimetra IP Micro
Building on the proven DimetraTM IP family of TETRA Solutions, Dimetra IP Micro provides the solution needed for localised operators of TETRA service.

 

Dimetra IP Micro extends the mission critical benefits of Motorola's proven Dimetra IP TETRA solutions to a wider range of commercial and enterprise users such as hotels, resorts, campuses, construction industry, manufacturing, mining, and transport. It is ideally suited for operators upgrading from analogue systems who require a smooth migration path. Dimetra IP Micro provides business critical trunked voice and short data services including full duplex telephony calls.

IP-MICRO-Brochure

 

Features


Plug and Play Installation The solution is simple to deploy, operate, and maintain. It employs a Web-based Network Management GUI.

Low cost of ownership The sites are linked through an Ethernet interface, potentially saving the cost of leased lines. Remote access allows system monitoring & diagnostics, this reduces maintenance cost. The unit can be wall mounted which saves precious space in equipment rooms, it also has lower power consumption and emitted heat.

Migration path Interface to existing systems allows smoother migration for customers with analogue systems looking for advanced digital solutions.

Optional services


* SDS (Short Data Service); Free text, Group SDS, SDS Store & Forward
* Telephony service, Voice over IP telephone calls up to 10 simultaneous calls
* Conventional channel gateway to interface to existing analogue systems
* Purchasible option, GPS position from the terminals for fast decision making and user safety.


 

 

MTS2 TETRA Base Station
A small, deployable TETRA base station with easy front access and low maintenance costs is ideal for rural or inaccessible sites.

 

The ultra flexible MTS 2 meets a growing demand for small, deployable base stations that ensure site acquisition and installation is as easy and economical as possible. Reduced site acquisition costs through lower site requirements, lower maintenance through less site visits and the ability to re-use MTS 2 in different configurations. Reduced installation costs due to effortless transportability. With its small and flexible modular design, MTS 2 dramatically reduces installation costs and makes site acquisition easier than ever. Excellent front access and a fan-free cooling capability means low maintenance costs and makes the MTS 2 ideal for rural or inaccessible sites.

Features


Flexible Configuration For Easy System Enhancement
MTS2 is extremely flexible in its standard configuration.

* Fits conveniently into a 19 inch cabinet, avoiding the need for disassembly, re-racking or re type approval. This allows the best possible space utilisation and support for both outdoor and shock absorbing transportable enclosures
* Can easily be expanded to a 4 carrier system without having to change antenna installations. Key Parts of MTS2 can be reused in an MTS4 cabinet

Designed for Reliability and Low Maintenance
Featuring the latest materials and components, MTS2 offers supreme reliability in various conditions plus a modular design including front access for easy servicing

* Because it can disperse heat without fans, MTS2 is ideal for inaccessible sites and rural areas where maintenance can be expensive and difficult. The fan-free system is very quiet and prevents the build-up of dust and dirt within the base station, further reducing servicing costs
* Required battery capacity and heat dissipation is low due to excellent power efficiency and with a strong integrated battery charger, power supply costs are kept to an absolute minimum
* The 10 Watt configuration is extremely power efficient as MTS 2 does not require fans to handle temperatures from -30 up to 55°C. Equipped with low noise fans, MTS 2 is fully operational up to 60°C at any power level up to 25 Watts after combining or 40 Watts without transmit combining

 

 

Dimetra IP Compact

Scalable TETRA Infrastructure like Dimetra IP Compact allows you to expand - without disrupting your existing users.

Dimetra IP Compact delivers a comprehensive, scalable communications solution using an enhanced IP architecture to ensure optimum call set up and availability. By revenue, we are the leading supplier of compact, scalable TETRA solutions.

Mission-Critical-Brochure

Features


Voice Rack
Supports TETRA Voice Services* including Group and Individual Calls. Compatible with Motorola MTS2 and MTS4 TETRA Base Stations and MCC7500 IP Consoles.

Enhanced System Rack
As Voice rack, plus expansion options:

* Short Data Services
* Packet Data (Single Slot & Multi Slot)
* Telephone Interconnect Gateway
* System Redundancy Option
* Voice Recording Option
* Security Option, including:
* Authentication
* Air Interface
* Encryption
* End to End Encryption Support


Modular, scalable solution to grow with you
The flexible architecture of Dimetra IP Compact allows you to start small and grow as your business grows. Whether starting from a single site or with voice only, our solutions allow you to expand when you want - and without disrupting your existing users.

Proven capability & feature set
Dimetra IP Compact uses the same proven software and architecture as our nationwide TETRA solutions in use by public safety organisations worldwide.

 

 

Motorola MTS1 TETRA Base Station

The small, flexible and yet extremely powerful MTS1 offers network operators a comprehensive coverage solution that can be rapidly installed and commissioned.

The MTS1 small rugged form factor, IP66 weather resistant enclosure, and ergonomic offers a wide variety of implementation options. Be it for indoor or outdoor wide area coverage applications, the MTS1 provides complete flexibility, covering wall and pole mounted installations. The MTS1 also ensures complete end-to-end security with full support for static, dynamic and group based air interface encryption, authentication and end-to-end encryption. This level of security is maintained even when there is a site link failure causing the base station to operate in local site trunking mode.

Features


Greater Levels of Resilience & Robustness
As the powerful MTS1 supports the full functionality of a TETRA base station, service is not dependent on wide area cells. High availability solutions can be readily enabled by simply connecting two MTS1 base stations to create a highly resilient two-carrier configuration.

Congestion Management

* Controlled mobility between wide area cells and micro cells
* Subscriber Class (Attract Users) and Valid Sites (Prevent Users) mechanisms already available

Additional Capacity

* Low enough RF power for in-building / near-building deployments enables re-use of frequencies
* Micro cells can take the load off of wide area cell:
o Mobility, Security and SDS
o Telephony, Individual Call and Packet Data

Designed for Reliability and Low Maintenance

* Full network and alarm management of device
* Automatic Interference Detection and Correction
* Withstands wide ambient temperature form -40 to +55 Celsius
* Traffic re-routed in the event of link failure
* Required battery capacity and heat dissipation is low due to excellent power efficiency, and with a strong integrated battery charger, power supply costs are kept to an absolute minimum

Lower Total Cost of Ownership

* Support for IP-over-Ethernet transmission technologies
* Includes native support for MPLS as well as traditional E1 connectivity
* Existing IP backbone can be leveraged to significantly reduce operational costs
* Direct AC power input eliminated the need for expensive rectifiers and simplifies installation and deployment
* Top of tower mounting capability requires shorter cables and reduces power costs

 

 

Dimetra IP TETRA Switches

High performance, secure and integrated wireless communications that are essential to the effectiveness of professional mobile communications.

Motorola’s Dimetra IP TETRA switches are the power behind our industry leading TETRA solutions. Indeed, as of October 2008, they have helped Motorola win 9 out of the last 10 nationwide public safety infrastructure contracts awarded.

Dimetra IP equipment, integrated with customer specific applications, combined with professionally managed services provide the high performance, dependable, secure and integrated wireless communications solutions that are essential to the effectiveness of professional mobile communications. Leveraging off Motorola’s proven technological expertise and market leadership in integrated solutions for demanding mission-critical environments, the truly scalable Dimetra IP portfolio delivers an array of voice and data capabilities and dependability when you need it most.

Features


SCALABLE
Flexibility and simplicity in deployment and Expansion
Motorola's Dimetra IP system accommodates your changing requirements. Scalable in size and features it meets customer requirements from a single to multi-sites and even onto a national scale. Functionality is also scalable, delivering voice services and add on services such as short data, packet data, telephone interconnect, as well as a comprehensive security suite.

Fast contact
Based on a flat mesh IP based architecture our mission critical systems delivers extremely fast, consistent group call set up times, even across multiple wide area zones, allowing consistently high speed call set up connections.

INTEGRATED
Higher efficiency packet data
Dimetra systems, with end-to-end IP configuration, provide the most comprehensive packet data service, including Multi-slot packet data (MSPD) in the TETRA market, keeping you connected and maximising the utilisation of network resources.

Extensive applications suite
The Dimetra portfolio supports a wide range of well-documented licensed Application Programming Interfaces (APIs), enabling organisations to connect seamlessly to other telecommunications networks and services, or integrate their operational I.T. applications.

RELIABLE
Inherent reliability
Dimetra IP systems' key platform components are fault tolerant, ensuring that the network continues to handle and deliver communications under adverse conditions.

Superior resilience and performance
Dimetra IP solutions are designed to deliver class leading performance and reliability, with support for redundancy throughout, from site links, base radio and site controller redundancy - to fully redundant switch and geographic redundancy.

SECURE
Motorola has been successfully implementing encrypted communications for well over 30 years. Dimetra IP systems encompass a full range of TETRA compliant encryption solutions to suit your budgets and operational requirements. Authentication and Air Interface Encryption are also offered in Dimetra mission critical systems.

Security and control
Virtual Private Networks (VPNs) allow organisations to share a network and still enjoy the security and control they require, without the expense of a dedicated infrastructure. Networks sharing enables organisations to co-ordinate operations through interoperable equipment and common talk groups.

Motorola Tetra
Digital Mobile Radio



Motorola Tetra

MTM5400 Mobile

 

 

The TEDS Ready MTM5400 mobile radio provides extended coverage, exceptional audio performance and high-speed data connectivity to address current and future critical communication needs of professional users. From advanced Over The Air terminal management capability, to integrated repeater-gateway and high-speed USB 2.0 interfacing, the rugged MTM5400 combines a wide range of advanced features for enhanced usability and improved safety.

Tetra-Terminals-Brochure


Designed for the Future

* TEDS Ready. The TETRA Enhanced Data Service platform for next generation mission critical data applications
* Advanced Remote Terminal Management - Enabled via software, this ground-breaking capability allows the radio to stay live while being programmed and software upgraded. This feature works to maximize productivity and eliminate radio downtime and will even work Over The Air.
* Exceptional voice communications capabilities based on a new high performance audio platform
* Unique AT multiplexer functionality that allows multiple data applications to be supported concurrently through the same physical peripheral port.
* Installation flexibility – connect multiple remote control heads or peripheral equipment to the transceiver for even greater levels of installation flexibility
* Secure connectivity to mobile computing devices and accessories via USB 2.0 peripheral interface
* Comprehensive end to end encryption functions including an integrated SIM based option.for additional flexibility.


Outstanding Operational Range

* Best in class RF performance helps to ensure that personnel are always within reach especially in high clutter and indoor environments
* Extended radio coverage on demand through integrated repeater/gateway functionality


Industry Leading Rugged Design

* Dust and Water ingress protection with the rugged IP67 control head option for enhanced weather resistance – a solution that is well matched to motorcycles or installations in challenging outdoor environments
* Industry leading durability, exceeding the requirements of ETS EN 300 019-1-5 Class 5M3



Motorola Tetra

MTM800E Mobile


Motorola’s MTM800 Enhanced TETRA control head sets the standard for new levels of durability, performance and usability. Developed for organisations where rugged and versatile mobile radios are essential, it builds on the key components of Motorola’s field-proven and trusted TETRA platform, placing information at the finger.

Tetra-Terminals-Brochure

• Ease-of-operation in the most demanding situations – unsurpassed audio quality, intuitive keypad and high-definition, colour display combined with a sleek yet durable design

• Dust and water resistant to IP 54. Rain, salt, fog, and dust protection tested to MIL 810 C/D/E/F for the standard control head

• Motorcycle control head rated IP67 for dust and water resistance

• Comprehensive model options available – for use in the office, in a vehicle - car, boat, motorcycle

• User training and familiarisation easier by design. Features the same cellular-style menu, icons and colour display that have established Motorola's MTH800 handheld and MTP850 portable

• Multiple language capability – support for European, Arabic and Cyrillic characters (plus many others)

• Access and query information on the move – integrated WAP* browser and Multi Slot Packet Data provide unique, high-bandwidth connectivity for real-time access to mobile office applications and user databases

• Tailor to specific requirements. Faster programming and connectivity via USB, ETSI compatible Peripheral interface (PEI) and programmable I/O ports* ensures tighter integration with third-party applications

• Full suite of TETRA security functions – air interface, SIM card* and end-to-end encryption

• Receive assistance when and where it is needed – hitting the emergency button not only alerts colleagues to critical situations but sends and updates dispatch on the user’s location

• Switch to covert mode at the press of a button

• Integrated GPS receiver delivers locationbased services. Knowing where your resources are enables you to allocate tasks based on up to date information

• Transform workflows and improve performance with the highest levels of network security, resilience and value available. Motorola’s TETRA solutions leverage more than 75 years of excellence in the most critical and demanding
environments.

• Stay at the forefront of TETRA development with a future-proof platform that meets the promise of the broadband world tomorrow.

• Build on the widest portfolio base in the industry. Motorola’s in-house technologies, solutions and best-in-class business relationships deliver the complete TETRA solution.

• Compatibility and interoperability assured. As an early pioneer of TETRA, Motorola has been a driving force in standards’ developments and product innovation.

Display
Alphanumeric

Keypad
True

Dimensions H x W x D
49 x 170 x 155 mm (radio only), 72 x 185 x 53 mm (standard control head), 58 x 185 x 58 mm (Motorcycle control head)

Weight
1370 (radio only), 1670 (radio with control head), 448 (Motorcycle control head only)

Configurations
Motorcycle

Encryption
True

Emergency button
Yes

 

 

 


Motorola Tetra
Digital Portable Radio

 

 

Motorola Tetra
CEP400

 

Motorola’s CEP 400 TETRA portable delivers the high performance and dependability required for enhanced workforce productivity and assured user safety.

Leveraging the best features of a two-way radio and a cellular phone, the lightweight and robust CEP400 has been engineered to ensure loud and clear communications even in high noise work environments.

Tetra-Terminals-Brochure

High Performance, Built to Last

* Rugged and lightweight, designed for optimum reliability in harsh conditions
* Superior audio quality for the most demanding environments
* Comprehensive range of accessories to provide a tailored solution
* Cellular phone style, optimized user interface
* Remote programming facility for cost effective radio terminal management
* Large high resolution colour (or grey scale) display

Unified Communications, Integrated Safety

* Trunked and conventional operation modes
* Full duplex PABX and PSTN interconnection
* Personnel safety and emergency call features
* Optional integrated GPS for personnel tracking

 


Motorola Tetra

MTP850 S

The MTP850 S is Motorola’s new TETRA portable terminal for mission critical mobile communications. Incorporating all of the features of the MTP850, this terminal incorporates an advanced Man Down sensor for exceptional user safety together with a new side connector for increased ruggedness. Providing higher power will increase range and in-building performance, and so Motorola has added Class 3L (1.8W) power output otion. Taken together with high receive sensitivity the MTP850 S has the capability for maintaining communications in the most demanding situations.

Tetra-Terminals-Brochure

Class 3l Transmit Power And Increased Receiver Sensitivity
The MTP850 S has been upgraded with a more powerful transmit power option and the receiver sensitivity is increased. This will benefit the user with greater DMO and TMO range.

Designed To Deliver - Designed For The Future
The MTP850 S comes with processing power to ensure users can take advantage of applications such as WAP and Multi Slot Packet Data.

Personal Safety
Protecting your staff is vital. The MTP850s incorporates the Man- Down feature to send alerts if the user may be at risk. Emergency calls are sent with automatic location updates.

True Colour - Truly Original
The MTP850 S has a 130x130 pixel display capable of displaying over 65,000 colours - ideal for viewing high resolution images via your WAP browser.

Secure Communications
Maintaining private and secure communications is increasingly important, with potentially sensitive information flowing through voice or data. The MTP850 S provides security, from inherent protection of a digital system to the highest levels of security using Air Interface Encryption or an integrated End-to-End encryption module.

Robust Side Connector
The Rugged Side connector ensures that the accessory will remain connected at all times even during a violent situation


Motorola Tetra

MCR1000

 

The TCR1000 is the smallest body-worn TETRA Covert Radio it provides fully featured TETRA radio functions to users in covert operations. This can easily be concealed in light clothing and ensures secure communications with encryption features that improve operational effectiveness in the field. The Motorola TCR1000 weighs less than 180 grams and its small, light-weight design helps officers to disguise their equipment during covert operations.

Tetra-Terminals-Brochure

• Part of Motorola’s highly capable and industry leading TETRA Radio portfolio

• Secure Communication for safety and protection of information

• TMO TETRA Class 2 / 3 Air Interface Encryption (SCK, CCK, DCK, GCK)

• Air Interface Encryption

• End-End Encryption

• 1W, Class 4 Tx Power

• Whisper mode for discrete use

• Integrated GPS option that allows users to be located in need of assistance

• Wide range of covert accessories to give officers flexibility in the way the radio can be worn

• Connection to extension battery for increased operational life

• Uses the same standard battery as cellular handsets

• CPS-Lite facility for changing the talk groups with a TETRA PDA

• Unique body worn double-loop antenna option increases range

• Semi rigid antenna, adds flexibility in terms of how the radio can be worn

Air interface encryption security classes
Class1 (Clear), Class2 (SCK), Class3 (DCK, CCK & GCK)

Air interface encryption algorithms
TEA1, TEA2, TEA3

OTAR
True

Authentication
Infrastructure initiated and made mutual by terminal

Network access
Temporary enable / disable (Stun), Permanent enable / disable (Kill)


Motorola Tetra
ATEX
MTP810Ex

 

Motorola’s MTP810Ex TETRA portable terminal provides high quality communication with comprehensive user safety and class leading ATEX specifications allowing use when in environments containing potentially explosive gas and dust. Motorola is a world leader in the development and deployment of TETRA communication solutions, and the MTP810Ex ATEX TETRA radio delivers safe and reliable communications for users with a powerful set of features to harness the capability of TETRA.

MTP810E-Specification
Tetra-Terminals-Brochure

PHYSICAL CHARACTERISTICS

Dimensions H x W x D (with standard battery) 135 x 55 x 38 mm
Weight 400 g (including battery, antenna)
PERFORMANCE CHARACTERISTICS

Battery capacity 725 mAh, 7.2V
Battery life - standard (based on a 05/05/90 duty cycle) 12 hrs, typ
Channel spacing 25
Power 1W
RF power control 3 steps of 5 dB
Frequency bands 380 – 430 MHz
OTAR Yes
RADIO FEATURES

Switching bandwidth 50 MHz
RF power level accuracy +/- db 2
Receiver class A & B
Receiver static sensitivity (dBm) -112 minimum, -115 typical
Receiver dynamic sensitivity (dBm) -103 minimum, -107 typical
Scan types Talk group
USER ENVIRONMENT

Operating temperature "-20°C to +50°C (Hazardous environments) -20°C to +60°C (Non-hazardous environments)"
Storage temperature -40°C to +85°C
Humidity ETS 300 019-1-5 Class 5.1 and 5.2
Dust and water IP65 per IEC 60529
Shock, drop and vibration ETS 300 019-1-5 Class 5M2
ATEX gas specifications II 2G Ex ib IIA T3, IEC Ex rating, Ex ib IIC T4
ATEX dust specifications II 3D Ex ibD 21 IP5x T90oC, Ex ibD 22 IP5x ib D21 T90oC (Approved for Zone 22, Equipment Group II)
IP Standards IP65
VOICE SERVICES

Talkgroups 2048 (TMO) & 1024 (DMO)
Phone book 1000 entries
Scan lists 40 lists, 20 talkgroups / lists
Ambience listening Yes
Transmit inhibit Yes
TMO SERVICES

Group call Late entry
Private call Half / full duplex
Telephony Full duplex
DGNA Up to 2047 groups
DMO SERVICES

Compatibility Gateway and repeater
EMERGENCY VOICE SERVICES

Smart emergency DMO / TMO / DMO to TMO
Hot mic Configurable timers
Location Send on emergency
Alarm Emergency status
DATA SERVICES

Status messaging 100 alias messages
Short data service (SDS) 20 message inbox, individual or group addresses, send/receive during calls
Packet data (PD) 7.2kbps - 28.8 kbps gross (single or mutli-slot)
Browser Integrated Openwave browser
PEI AT commands
SECURITY FEATURES

Air interface encryption algorithms TEA1, TEA2, TEA3
Key provisioning "Secure provisioning tool (key variable loader KVL) Over the Air Re-keying (OTAR) for SCK and Class 3 (CCK & GCK)"
Network access Temporary enable / disable (Stun), Permanent enable / disable (Kill)
Authentication Infrastructure initiated and made mutual by terminal
Air interface encryption security classes Class1 (clear), Class2 (SCK), Class3 (DCK, CCK & GCK)
GPS SPECIFICATIONS

Simultaneous satellites 12
Mode of operation Autonomous or assisted (A-GPS)
GPS antenna Integrated in TETRA antenna
GPS sensitivity -152 dBm / -182 dBw
GPS accuracy 5 meter (50% probable)
Location protocols ETSI LIP, Motorola LRRP


Motorola Tetra
ATEX
MTP850Ex

 

Motorola’s MTP850Ex TETRA portable terminal provides high quality communication with comprehensive user safety and class leading ATEX specifications allowing use when in environments containing potentially explosive gas and dust. Motorola is a world leader in the development and deployment of TETRA communication solutions, and the MTP850Ex ATEX TETRA radio delivers safe and reliable communications for users with a powerful set of features to harness the capability of TETRA.

MTP850EX-Specification
Tetra-ATEX-Brochure

High Performing Communication

* Strong rugged design for optimum reliability in harsh conditions
* Powerful, high quality audio in most demanding environments
* Full range of supporting ATEX certified accessories to tailor customize solution

Comprehensive User Safety

* ATEX & IEC-Ex gas and dust approvals
* Integrated GPS for user location

High Performance Communication
The MTP850Ex delivers best in class audio performance in the typical noisy environments where specialist users from industry or public safety operate.

Comprehensive User Safety
The MTP850Ex can be used in explosive gas and dust environments due to its high level of protection – including dust Zone 21 and 22. Operational safety is further enhanced with a range of features including:

* State of the art integrated GPS receiver providing the ability to locate personnel through the radio, improving user safety and resource management.
* Internal “Man Down” alert - this fully integrated solution triggers an emergency procedure when the carrier of the radio remains motionless far a set period or falls down.

Simple but Powerful User Interface
The simplified keypad with large button surface makes the MTP850Ex easy to use with gloves. Combined with the large scalable display fonts and icons, the MTP850Ex facilitates operation in difficult environments with limited visibility.

Data Applications Capability
The integrated WAP browser and Multi-Slot packet data enables rapid access to critical information in the field. Applications are further enhanced with ability to have simultaneous Short Data Service (SDS) and Multi-Slot packet data services via TNP1 protocol.Internal “Man Down” alarm.

 

 

Key Voice Services and Facilities:

* Group Call (commonly called ‘all in formed net’ and ‘talk group call’)
* Pre-Emptive Priority Call (Emergency Call)
* Call Retention
* Priority Call
* Busy Queuing
* Direct Mode Operation (DMO)
* Dynamic Group Number Assignment (DGNA)
* Ambience Listening
* Call Authorised by Dispatcher
* Area Selection
* Late Entry
* Voice Encryption

Group Call
This is probably the most basic voice service in TETRA but yet the most complex to support effectively and efficiently. This is because group calls need to:

* Use simple “Push To Talk” operation to provide fast call set-up group communications
* Be operated and managed in particular ways to optimise network loading, some examples being:
* Operate in simplex
* Operate on a "preferred" site for optimum network loading
* Have a defined area of operation (Area selection)
* Have a very reliable call-set up signalling protocol to ensure all users in a group are connected together when a call is first initiated (call acknowledgment signalling is impractical for group calls)
* Have priority mechanisms to ensure that specified users in a wide area group call (spanning multiple base station sites) are connected together when a network is busy

It is this complexity needed to support group calls that makes public cellular networks unsuitable, simply because they were originally designed to support “One to One” calls, unlike TETRA which was primarily designed to support group calls at the outset.

Pre-emptive Priority Call
This call service, of which the highest priority is the emergency call, provides the highest uplink priority and highest priority access to network resources. If a network is busy, the lowest priority communication is dropped to handle the emergency call. Unlike 911, 112 or 999 initiated public network emergency calls (which can also be supported on TETRA) the TETRA emergency call can be initiated by using a dedicated switch located on the terminal. Activating the emergency call automatically alerts the affiliated control room dispatcher and other terminal users in that persons talk group.

Call Retention
This service protects selected radio terminal users from being forced off the network as a result of pre-emptive calls (emergency calls) during busy periods. When emergency calls are supported in a network, it is essential that only a small number of radio terminal users are provided with this facility as the objective of retaining important calls during busy periods could be lost.

Priority Call
During network busy periods, that service allows access to network resources in order of user terminals call priority status. As there are 16 levels of priority in TETRA, this service is very useful in providing different Grade of Service (GoS) levels (and tariff structures) during busy periods. For example, front line officers would be provided with the highest priority levels in a Public Safety network to maintain the highest level of service access whilst routine users would be provided with lower priority levels.

Busy Queuing
In TETRA a queue is provided in the trunking controller during network busy periods to store and handle calls on a First In First Out (FIFO) basis in order of user priority level. The advantage is that a user only has to initiate a call request once, knowing that even in busy periods the call will be automatically established once a traffic channel becomes free, thus reducing user stress and frustration when contending with other users on a busy network.

Direct Mode Operation (DMO)
Direct Mode Operation (DMO) provides the ability for TETRA radio terminals to communicate directly with each independent of the TETRA network infrastructure. DMO is not new and has been a facility mandated and used by many traditional PMR user organisations for several decades. The primary requirement for DMO has been brought about by the need to balance the RF Coverage, Grade of Service (GoS) and Reliability of a network with that of the network’s overall cost. The requirement for DMO makes the use of public cellular networks unsuitable.

Dynamic Group Number Assignment (DGNA)
This service allows the creation of unique Groups of users to handle different communication needs and may also be used to group participants in an ongoing call. This service is considered by many public safety organisations to be extremely useful in setting up a common talk group for incident communications. For example, selected users from the Police, Fire and Ambulance could be brought together to manage a major emergency where close co-ordination between the three emergency services is required. Similarly, DGNA is also considered useful for managing incidents by other user organisations such as Utilities and Transportation.

Ambience Listening
A Dispatcher may place a radio terminal into Ambience Listening mode without any indication being provided to the radio terminal user. This remote controlled action allows the dispatcher to listen to background noises and conversations within range of the radio terminal’s microphone. This is an important service to utilise for those persons transporting important, valuable and/or sensitive material that could be ‘hijack’ targets. Similarly, this is a useful service to have implemented in public service vehicles where a driver’s health and safety could be at risk.

The number of user applications for the Ambience Listening service are numerous and in many cases application specific. However, it is important to note that many users feel that this service invades a person’s privacy and for this reason only those users who need Ambience Listening as part of their work duties should be provided with this service.

Call Authorised by Dispatcher
This services allows the dispatcher to verify call requests before calls are allowed to proceed. This is a useful service to utilise when radio user discipline needs to be maintained. This service also reduces the amount of radio traffic on a network as only essential work related calls are permitted. However, the frequent need for all informed net group communications between terminal users and the time delay experienced in authorising calls can make this service unacceptable for some user organisations.

Area Selection
Area Selection defines areas of operation for users and can be chosen on a ‘call by call’ basis. This service basically simulates the ability for a dispatcher to select different base stations to make a call as was possible in conventional networks. This service also helps to improve network loading and overall spectrum efficiency by restricting the area of operation for selected group calls.

Late Entry
This service provides continuous call in progress updates to allow latecomers to join a communication channel. This is not a service but an air interface feature that allows a trunked radio terminal to behave in a similar way to conventional PMR terminals. For example, if a user turns on their TETRA terminal the control channel will automatically divert the user’s terminal to a talk group call, if a call is already in progress. Similarly, if the user’s terminal has been outside radio coverage, for example in a tunnel, the control channel will also divert the user’s terminal to a talk group call assuming a call is already in progress.

Voice Encryption
The TETRA standard supports a number of over the air TETRA Encryption Algorithms (TEA’s), the differences being the types of users who are permitted to use them. The main benefit of over the air encryption is that it can be implemented as software within radio terminals and base station equipment, instead of using encryption modules, which consume space and increase cost. The TETRA standard also supports ‘end to end’ encryption using a variety of other encryption algorithms as deemed necessary by national security organisations.