How is telephone distributed in a home?
Traditionally in the US, residential POTS was daisy-chained via 4-wire copper cable with drops at junction boxes or sockets. Only 2 wires (red/green) were used, with 2 spares (yellow/black). All the phones were in parallel, which caused potential problems with inadequate ringer current from the central office. The easy solution was to disconnect the ringers of extension phones.