DSL (Digital Subscriber Line) makes use of the unused frequency spectrum of the twisted pair telephone cables by carrying a digital signal without interfering with the voice service. DSL technology has evolved over the years with fibre reaching closer to the customers’ premises resulting in shorter copper loops. This has allowed twisted pair cables to exploit higher frequencies used in VDSL2 and G.Fast.
ETSI is very active in the definition of physical layer standards for DSL technologies including the specification of reverse power feeding typically for use with G.Fast. This technology enables powering of small network nodes from the customers premises over the same copper pair that carries the DSL or G.Fast signal.
TC ATTM Working Group TM 6 is responsible for digital access transmission systems on metallic wired infrastructures (e.g. twisted pair, coaxial pair, power transmission lines/PLT), particularly for digital subscriber line systems (DSL) on balanced wired (twisted pair) Infrastructures and will produce within their scope: