Editing Telephone jack and plug (section)

==Connections==
The installation of a conventional wired [[telephone]] set has four connection points, each of which may be hardwired, but more often use a plug and socket:
*telephone line to phone cord: The wall jack. This connection is the most standardized, and often regulated as the boundary between an individual's telephone and the telephone network. In many residences, though, the boundary between utility-owned and household-owned cabling is a network interface on an outside wall known as the demarcation point; all wall jacks in the home are part of the household's internal wiring.
*telephone cord to telephone set base: This connection is generally not regulated, but instead follows de facto standards. It is often a [[6P4C]] connector, which is often [[RJ11]], but may be proprietary or hardwired.
*telephone set base to handset cord: By de facto standard, this is usually a [[4P4C]] connector. 
*handset cord to handset: The handset end of the [[straight-through cable|straight-through handset cord]] also uses a [[4P4C]] connector.

Some of these may be absent: Wired telephones may not have a separate base and handset. The defining characteristic of wireless telephones is that they do not have a handset cord, and the defining characteristic of mobile telephones is that they do not have a phone cord.