Network: Any physical infrastructure network that forms a telecom-related network and occupies physical space in/on the ground.
About
sdt.net Germany FTTH network. sdt.net (Aalen) has operated VDSL and fibre for more than 20 years, but historical expansion focused on FTTC/FTTB; current FTTH is rolled out municipality by municipality under TNG (acquired July 2023) (Source), (Source). Establishment date checked but not reliably determined.