• Decentralized architecture
  • Transmission breaks
12 January 2021

Transmission breaks and how to minimise their impact

Transmission breaks in radio communication are unavoidable – however, you can optimise your network design to minimise their impact.

Centralised architectures and their pitfalls

In a centralised network setup, communication services depend fully on one centralised server. In case of a transmission break, the affected nodes will go into fallback mode. While local communication is still possible in fallback mode, local communication features will be limited and there will be no external communication. Last but not least, network security is affected in fallback mode with only security class 1 or 2 being possible, i.e. clear mode or air interface encryption (AIE) with static keys.

Decentralised architectures and their benefits

In a decentralised architecture, many of those headaches have been removed along with the vulnerability of having one central switch and thus also one single point of failure. Key advantages in a decentralised network are:

• Network-wide data is available in all nodes
• All communication features are available, even if a node is isolated from the network
• Network-wide network management system is visible on any node
• Data logging (recording) can be activated on any node in the network
• Gateways to dispatchers and external networks can be activated in any node
• It is easy to add/remove nodes

This means that in case of a transmission failure, full services are still available within the isolated areas, including:

• Communication with control rooms
• Interfacing to external networks
• Security class 3, the highest level of TETRA air encryption

Combined with the flexibility of a decentralised network when it comes to expansions as well as the cost-effectiveness of up-scaling and implementation of full redundancy, a decentralised setup is the better option on all parameters.

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