April 28, 2008
architectures of expandable Phone Systems
A key system or expandable Phone Systems refer to the multiline systems very often used in small businesses and offices. Expandable Office Systems are specially noted for their expandability. Another special feature of expandable Phone Systems is the proposition of having individual line selection buttons for each connected phone line. Dialable intercoms may also be present in some systems. The telephone systems are set up using three principal architectures. They include electromechanical shared-control, electronic shared-control and independent key sets . Before the development of large scale integrated circuits, the systems were built out of the same electromechanical components called relays just as larger switching systems are made.