a subscriber's line associated with that part of a private telephone installation connected to this line during a telephone call NOTE - This term is used in the context of transmission planning and performance. Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=722-16-17
a subscriber's line associated with that part of a private telephone installation connected to this line during a telephone call NOTE - This term is used in the context of transmission planning and performance.