In this episode, we discuss the evolution of systems connectivity, including the successful implementation of cross-border communication using Inter-System Interface (ISI) and how this experience laid the foundation for bridging legacy LMR systems with MCX broadband solutions.
We are joined by Michel Duits, a Senior Principal Engineer at Norway's Directorate for Civil Protection (DSB), where he leads the proof of concept for interworking functions for Norway's National Public Safety Network. Beyond his work at DSB, Michel co-champions the IWF Working Group at TCCA alongside Harald Ludwig and represents DSB in the EUCCS program, contributing to the development of interoperable and secure communication systems across Europe.
Key topics covered
Understanding Interworking Functions (IWF)
- Definition: The bridging functionality that connects LMR systems (Tetra, P25, DMR) with MCX application servers
- Core Function: Enables communication between different domains through identity mapping, protocol translation, and data transport
- Key Capability: Press-to-talk functionality across different system standards
Implementation Challenges and Solutions- Starting Point Dilemma: How and where to begin the transition process
- User-Centric Approach: Focus on actual user needs rather than theoretical capabilities
- 80/20 Rule: Achieving 80% functionality today is better than waiting for 100% perfection
- Phased Implementation: Breaking down large infrastructure projects into manageable steps
Multiple Pathways to Interoperability- Native Interworking Function (Ideal but limited vendor support)
- ISI (Inter-System Interface) - Primary focus of current development
- API-based Solutions - For control room integration
- Proprietary Systems - Not recommended due to vendor lock-in
Current Proof of Concept Initiative- Timeline: Started 18 months ago with TCCA working group
- Collaboration: Working with Sweden, Finland, and interested vendors
- Approach: Moving from simulators and emulators to real system testing
- Goal: Demonstrate end-to-end communication between Tetra terminals and MCX applications
Michel's 5-Year Industry Vision- Collaboration Over Competition: Industry players putting aside egos to work together
- Open Standardized Ecosystems: Systems that allow organizations to transition at their own pace and budget
- Accelerated Development: Faster industry response to what Michel describes as "the clearest commercial business case in 25 years"
- Knowledge Sharing: More transparency and cooperation between industry stakeholders
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