The Model LE200 is used in pairs to provide a transparent extension or expansion of a conventional Page/Party® or SmartSeries™ single or multi-party system. It can extend the system by linking two Page/Party® system cables located in areas separated by an appreciable distance. It can expand the system by allowing additional field devices to be connected with minimal loading to the page and party lines. Each unit interfaces to one page line and up to five party lines, and provides connections for a page line audio detector output, a page line ground-fault detector output, a page line monitor output, five external auxiliary inputs, and five corresponding auxiliary contact closure outputs