This European Standard defines the mandatory and optional requirements for the medium specific physical and data link layer for HBES Class 1 Twisted Pair in its two variations called TP0 and TP1.
Data link layer interface and general definitions, which are media independent, are given in EN 50090-4-2.
BS EN 50090-5-2:2004 history
2020BS EN 50090-5-2:2020 Home and Building Electronic Systems (HBES). Media and media dependent layers. Network based on HBES Class 1, Twisted Pair
2004BS EN 50090-5-2:2004 Home and building electronic systems (HBES) - Media and media dependent layers - Network based on HBES Class 1, Twisted Pair