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24 Elektronik International 2020 Wireless PRE-COMPLIANCE WITH EUROPEAN STANDARDS The VdS label is a seal of quality and is the most important quality indicator for those responsible for safety security systems when deciding purchasing integrating and installing security technology and security services especially in commercial buildings Organized in association with other European countries the Association of Property Insurers is also recognized worldwide in its sphere of activity A VdS certificate allows securityrelevant systems to be approved after they have been checked for security reliability and more The aim is to use the tested techniques to reduce the risk of damage and ultimately to prevent damage prematurely The technical hurdles are enormous in order to obtain a VdS certified product and system If a manufacturer is interested in having a product certified with a wireless link this manufacturer must make large investments in order to ultimately develop its proprietary wireless technology for safetycritical applications As it is important that there is no interference with safetyrelated applications this wireless technology still has to pass lengthy In years of cooperation with the VdS the IP500 Alliance has successfully developed a robust and reliable wireless IoT standard in a first step of preconformity according to EN 501315-3 2 for some important applications required to establish IoT platform This preconformity allows the members of the IP500 Alliance tocertify their products which are equipped with an IP500 wireless module CNX200 without additional development effort and other preconformity testing for the VdS This results in considerable time and cost savings for the manufacturer WIRELESS TECHNOLOGY FOR THE HIGHEST DEMANDS In order to meet all requirements to achieve conformity and interoperability the members and partners of the IP500 Alliance have coordinated and developed the entire IP500 system at all three levels layers The three levels are ➔ 1 Wireless transmission PHY MAC ➔ 2 Network stack and application ➔ 3 Protocol infrastructure gateway and database The first two levels wireless transmission and network stack are closely coordinated and essentially form a unit as the example of true dualband technology with mesh topology shows In this case the PHY level provides both frequencies simultaneously and the network stack level automatically routes the data packets depending on the interference in one of the bands to the target node a gateway or a terminal device ADVANTAGES OF THE IP500 STANDARD ON THE WIRELESS LEVEL Due to the requirements from the system level OQPSK Offset Quadrature Phase-Shift Keying was chosen for modulation The basis for this is the IEEE standard 802 15 4 2006 which provides OQSPK for higher data rates in the 2 4 GHz band Due to the system requirements of the security applications the simultaneous use of both bands Sub-GHz and 2 4 GHz was specified in the IP500 standard This created a very high level of robustness against interference Combined with the asynchronous meshing process of the network stack the IP500-PHY and network stack can avoid different interferences both in the case of interference on the frequency level and in the event of interference on the routing path The measurement results in Figures 3 and 4 measured in a real environment with high interference as are typical for buildings tunnels or metallic environments aircraft and ships provide an insight into the robustness of the IP500 standard compared to other wireless standards that are used worldwide It is advantageous to have a smaller signaltonoise ratio SNR position of the Figure 5 IP500 uses a finer subdivision of the data link layer than the previously known OSI model image IP500 Alliance Figure 6 The application data is nested several times in packets in the higher levels of the IP500 protocol before it is sent out by wireless image IP500 Alliance