Our Tetra solution is based on the HYTERA Accessnet © Tetra infrastructure, which is developed in Germany. As the only German manufacturer, Hytera Communications Co. Ltd. Offers a comprehensive infrastructure portfolio of TETRA radio network components. On the basis of system controller nodes and base stations from our own ACCESSNET®-T IP range of products, we design and set up customized professional mobile radio networks - from single-cell private radio networks up to nation-wide networks. Flexibility is our greatest asset. Apart from the versatile configuration possibilities of ACCESSNET®-T IP, you profit from its unique scalability, which makes a later network expansion very easy.

Our Infrastructure is used world-wide in over 40 countries in both private and government sectors. One of the largest Civil defence system is the Malaysian Civil defence network, which has over 500 Sites, Multiple Dispatchers and control room and more than 10.000 Active users and a capacity of 70.000 users. This network is used by all Public service organizations, from Army, Police, Fire brigades, Ambulance services and others.

Tetra Standard

TETRA is the acronym of Terrestrial Trunked Radio and it is a global Standard for the digital trunked radio. As a digital method of transmitting mobile radio signals, TETRA is characterized by high voice quality and improved spectrum efficiency.

This standard was developed by the European Telecommunications Standards Institute (ETSI) in partnership with leading manufacturers, operators and user organisations. Secure voice and data transmission, excellent functionality and a wide range of performance features guarantee the adaptability needed to meet the challenging requirements of professional mobile radio and its usage-critical applications.

As a system platform, TETRA is able to bring together the services for trunked radio and mobile data transmission that were previously confined to isolated infrastructures. This increases flexibility and helps to relieve cost pressures on network operators and users.

Tetra Base stations:

The Digital Indoor Base Station (DIB-500) is proposed as a base station in ACCESSNET®-T IP network. The base station is responsible for radio coverage in a defined radio coverage area. For this purpose, up to eight carriers are available depending on the antenna coupling variant. It can thus provide as many as 32 radio channels (four radio channels per carrier) for the communication of the mobile terminal equipment, via which voice and data is/are transmitted in accordance with the TETRA standard (Terrestrial Trunked Radio).

The Base stations are linked together through an IP network (Microwave or Fibre Optic Links). The System can be anything from single site to a national network with multiple IP-Nodes.

Feature set of the Tetra Platform

There are multiple ways to communicate on the Tetra infrastructure, depending on the needs of the user groups. All communications are secured, so that someone not part of a specific communication can’t interfere or listen into it. Each of the features are depending on the permissions a Terminal has on the main database. They can be individually granted to a terminal.

Group Calls

The number of workgroups available is unlimited and will be designed to the Public Services section requirement. A user can belong to multiple groups. When part of a specific group the user can be reached wherever they are throughout the geographical area of the network. Different group calls are available:

• User Groups: are groups depending on the section or sub-section of the establishment the user is member
• All Call: Is a group call to make a general message in a Fleet of user groups.
• Announcement Call: Is a voice message to all users in a Fleet of user groups with no reply option.
• Dynamic Group: Are groups that are created when needed by the dispatcher to fulfil a specific task or operation. Here Terminals from different section of the service groups can be assigned to work together. The terminals are programmed over the air to join that specific task group. Once the Task is fulfilled the operator will then remove the task group and the terminals will return to their specific home groups.

Individual calls:

Individual calls on the Tetra network is similar to the phone calls on a GSM network but with state of the art security features. The user can either dial the number or select a name in the contact list. These call can only be one within the radio fleet the terminal are member of. High ranking officers can be given permissions to make calls through all terminals.

There are 2 ways of making individual calls:

• Semi – Duplex call: The user will dial the correspondent number and press the PTT to talk, and has to release the PTT to listen to the answer.
• Full- Duplex call: Here the radio acts like a telephone, dial the number press the call button and wait for an answer from the other end. A call is ended by hanging up using the Hang-up Button.

Messaging features

• Free text messages: The system supports text messages like SMS to individuals and user groups. These messages can be written using the numeric keyboard on the terminals. Up to 160 Characters can be used to create these messages.
• Pre-coded messages: The radios can send Status messages by the press of a button, where each key is a dedicated pre-coded message. So there is no need for typing a text for messages that are used very often. The messages can also be selected by a rotary switch on the terminal.

Security Features

The Tetra network has the highest security feature in the modern radio communication world.

• The Tetra network protocol makes eavesdropping impossible.
• Radios will be authenticated automatically before being used on the network.
• Stolen or lost radios can be disabled, so that these can’t be used against the state’s interest.
• Any radio can only participate in communications on which they are authorised.
• End to End Encryption is embedded.
• Listening in Facilities, for monitoring areas under suspicious activities by authorised staff in the control centre.