Slide 1 TETRA (PowerPoint) by ert554898

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									TETRA Gateways and Repeaters

           Kenneth Hubner
       Regional Director Sepura
     kenneth.hubner@sepura.com
Introduction
What is Direct Mode?
Types of Direct Mode Equipment
Benefits of Direct Mode
Gateway and Repeater Applications
What is Direct Mode?
Direct Mode is direct communication between two or more
TETRA terminals without the use of a network infrastructure.
Types of Direct Mode Equipment
1. DM-MS   Direct Mode capable TETRA terminal




           Back-to-back (standard DMO operation)
Types of Direct Mode Equipment
1. DM-MS    Direct Mode capable TETRA terminal
2. DM-REP   Direct Mode Repeater

                                    Repeater

            DMO




                  DMO                            DMO
                                    DMO




              Extends coverage between DMO terminals
Types of Direct Mode Equipment
1. DM-MS   Direct Mode capable TETRA terminal
2. DM-REP  Direct Mode Repeater
3. DM-GATE Direct Mode Gateway
                              TMO         TETRA
                                          Network

       DMO




                                    TMO
     DMO



                                                    Control Centre


             Relays communication between DMO and TMO
Benefits of DMO
•   Allows communication when network is not available
    –   during network rollout
    –   outside network coverage
    –   during network capacity limitations
    –   when a network fails
•   Allows communication on the boundary of network coverage
    –   Predictable operation in poor signal strenght areas
    –   Extending the network reach with the help of DMO Gateways
•   Allows communication when no monitoring is wanted
    –   During covert use no monitoring from network might be wanted
Gateway and Repeater applications
1. Unpredictable coverage

2. In building coverage

3. Fallback operation

4. Location of remote users

5. Extending DMO coverage
Gateway and Repeater applications
1. Unpredictable coverage
When leaving a vehicle, handportable coverage may not be predictable:
    Operating in built up areas
    Roaming into public buildings (shopping centres etc.)
    Operating near large metallic structures
    Operating in a rural environment
DMO provides some predictable guidelines to follow for coverage planning
Using a Repeater will allow coverage area to be extended
Using a Gateway will allow handportable operation in DMO,
whilst still enabling communications with trunked mode users.
Gateway and Repeater applications
1. Unpredictable coverage

Police officers when operating on foot after leaving a vehicle

Fire crews using the appliance as a gateway or repeater on the fire ground

Ambulance Crews leaving the vehicle to attend to patients

Transportation users when parked in depots use Gateway for
communications to Trunked mode users
Gateway and Repeater applications
2. In-building Coverage
Large buildings such as power stations,
storage buildings and metallic
structured buildings may have
no TMO coverage                                TMO


                                                         TETRA Infrastructure
A Gateway can be used to allow
DMO communications within the                 Gateway

building, and a link to TMO users
                                                        DMO
outside of the building

                                          DMO User

                                          Underground Bunker
Gateway and Repeater applications
3. Fallback Operation
Mobile Coverage

Handportable Coverage




                        Gateway
Gateway and Repeater applications
3. Fallback Operation
Mobile Coverage

Handportable Coverage




              DMO User




                         Gateway
Gateway and Repeater applications
4. Location of remote users
Users out of coverage can report their position via built-in GPS receiver.
The position report can be sent in DMO to the gateway which can relay it
to TMO users or an operator.

                                     TMO SDS
                       TETRA                                    PEI SDS
                                                   Gateway
                       Network
                                 Position Report
      TMO SDS                                                Position Report


         Position Report
Gateway and Repeater applications
5. Extending coverage

Provide coverage between two geographically separated sites when there
is no network coverage available.

                                                     Site B
         Site A




                      DMO                DMO
                              Repeater
                                                     DMO User
       DMO User
Gateway and Repeater applications
Summary
•   Direct Mode is a complementary service to Trunked Mode operation
•   Utilisation of DMO Gateways and Repeaters provides:
    –   Network extension capabilities
    –   Predictability of coverage for working practices
    –   Workflow Management
    –   Location and management of DMO users from network Control Centres
    –   Fallback scenarios, when base station sites fail
•   DMO must be classed as an essential service in Public Safety,
    Transportation and Utility networks
     Any Questions?
kenneth.hubner@sepura.com

								
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