RMCDE (Supervision Message Conversion and Distribution Equipment  ) is the name of a system designed to distribute surveillance information to a community of user systems.
A Traffic Control (ATC) subsystem is a subsystem that has a requirement to provide the most up-to-date information. (Eg Operator Display System, Flight Data Processing System, ATC Tools, Flow Control Control Units, Remote Terminal Maneuvering Area, Military Units, etc.). The data can be originating from a surveillance sensor (eg radar , ADS-B receiver, multi-lateration system) or a data processing system (eg ARTAS )
RMCDE is a Multibus II based multiprocessor system consisting of a processor and IO boards connected via a parallel data bus.
In addition to its distribution function, the RMCDE offers data validation, conversion and filtering.
Until 1990, each ATC center was serviced by a dedicated set of (local) radars. Radar data exchange was only done at a limited scale, one of the reasons being that the sensors were using proprietary, incompatible formats. An exception to this practice is the Eurocontrol Maastricht Upper Area Control Center (MUAC). Designed from the beginning as an international center handling only en-route traffic, it does not have its own sensors since the MUAC airspace was already sufficiently covered by the sensors of the 4 participating states ( Belgium , Netherlands , Luxembourg and Germany ).
In April 1990, the Ministers of Transport of the European Civil Aviation Conference (ECAC) launched the “En-route Strategy for the 1990s” – a multilateral strategy designed to ensure that, by the end of the century, Forecasted demand. This strategy is the first step in the evolution of the harmonization and integration of Air Traffic Services throughout the ECAC area.
One of the key points in this strategy was to harmonize the data formats used in ATC data exchange. The format for monitoring was ASTERIX (All Purpose Structured Eurocontrol SuRveillance Information Exchange).
The combination of harmonization, MUAC data and the emergence of computer network technology.  RADNET.
The main component in RADNET is the RMCDE. It takes care of the data routing within the network and acts as a gateway between sensors and ATC users.
In the early days, the conversion of data from proprietary formats to the open ASTERIX format (and back) played a crucial role in the acceptance of ASTERIX. The conversion allowed a smooth transition to the new standard.
The RMCDE is one of the first systems in the ATC domain that would now be called publish / subscribe services. Each user in connected to RADNET can subscribe to surveillance data provided by any of the other RMCDEs in the network. The RMCDE allows the user to access the network in a few seconds. This gives a huge boost in the international exchange of surveillance data. Whereas this exchange initially was mainly used to get a seamless coverage, it is now becoming an important element in reducing the cost of air navigation service provision by sharing resources.
In an ATC center the RMCDE is used as a front-end processor (ie the first system to be encountered by incoming surveillance data). This means that it can be used as a gatekeeper. It therefore has a number of capabilities to protect downstream systems. The ASTERIX standard is a set of standard and corrupted data that is immediately discarded. The filter function, both static and dynamic (ie depending on load), ensures that downstream systems are not flooded by huge amounts of unnecessary data.
RMCDE / RADNET Implementation Team (RIT)
The RADNET / RMCDE combination is not only for monitoring data exchange. It is a complete service concept. In addition to the technology, a common implementation approach was developed, and the EUROCONTROL established an organizational unit that was responsible for the day-to-day support of both the technological and organizational aspects. The EUROCONTROL member states. The RITis tasked with configuration management and coordination of activities related to RADNET and the support and development of technology that ensures the continuity of monitoring.
MUAC (ie Amsterdam, Brussels, Düsseldorf and Bremen), more than 100 RMCDEs have been deployed in the ATC infrastructure of 18 Eurocontrol member states.
After almost 20 years of service the Multibus II based architecture can be considered as obsolete and the software is no longer compliant with modern regulations. In addition, the phasing out of the X.25 technology requires new solutions to be put in place for network communication. Therefore, Eurocontrol decided in 2008 to develop a successor, the SDDS (Surveillance Data Distribution System). The SDDS will be fully in line with the requirements of the European Union. With the introduction of the SDDS, the RADNET will transition to SURNET, which will be renamed to the SURNET Implementation, Maintenance and Operational Support Team (SIMOS).
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