Ep 87: Interworking Functions (IWF) - Bridging Legacy and Next-Generation

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 coveredUnderstanding Interworking Functions (IWF)Definition: The bridging functionality that connects LMR systems (Tetra, P25, DMR) with MCX application serversCore Function: Enables communication between different domains through identity mapping, protocol translation, and data transportKey Capability: Press-to-talk functionality across different system standardsImplementation Challenges and SolutionsStarting Point Dilemma: How and where to begin the transition processUser-Centric Approach: Focus on actual user needs rather than theoretical capabilities80/20 Rule: Achieving 80% functionality today is better than waiting for 100% perfectionPhased Implementation: Breaking down large infrastructure projects into manageable stepsMultiple Pathways to InteroperabilityNative Interworking Function (Ideal but limited vendor support)ISI (Inter-System Interface) - Primary focus of current developmentAPI-based Solutions - For control room integrationProprietary Systems - Not recommended due to vendor lock-inCurrent Proof of Concept InitiativeTimeline: Started 18 months ago with TCCA working groupCollaboration: Working with Sweden, Finland, and interested vendorsApproach: Moving from simulators and emulators to real system testingGoal: Demonstrate end-to-end communication between Tetra terminals and MCX applicationsMichel's 5-Year Industry VisionCollaboration Over Competition: Industry players putting aside egos to work togetherOpen Standardized Ecosystems: Systems that allow organizations to transition at their own pace and budgetAccelerated 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 Get Involved:Have questions or want to join the podcast? Email us at critcommscircle@omdia.com