physical and data link layer for twisted pair in its two variations, TP0 and TP1) EN 50090-5-3 2006 : Radio frequency (defines requirements for the RF physical and data link layer) Part 6: Interfaces EN 50090-6-1:2017 : Webservice interface (defines a standardized web service-based interface with other IT systems via a gateway device) Part 7: System Management EN 50090-7-1:2004 : Management procedures (capturing the dynamics of managing distributed resources on the network in terms of a sequence of telegrams, exchanged between two partners: the management client and the management server) Part 8: Conformity assessment EN 50090-8:2000 : Conformity assessment of products Part 9: Installation requirements EN 50090-9-1:2004 : Generic cabling for HBES Class 1 (provides cabling planning and installation rules taking into account the layout of the cable support, cables and connectors, and commissioning) References External links Site map for the CENELEC website 50090 Electronics standards