RESIDENTIAL / COMMERCIAL TELEPHONE WIRING:
In recent years wiring standards for telecommunication devices in the home and office have become much more sophisticated. The simple quad wire (four wire, non-twisted telephone station wire) that was standard for so many years is no longer acceptable for modern residential / commercial systems.
In the days when the telephone company was responsible for wiring in the house / office, telephone use
was much simpler. Usually there was just one line and maybe an extension or two. Simple quad wire was the norm. Modems, answering machines, residential / commercial PBX systems, computer networks were either nonexistent or very rare. Quad wire was good enough then, but not now. It doesn't have the circuit capacity, noise immunity, or bandwidth to satisfy today's and tomorrow's communications needs.