ZE 2200 is a 6-zone expander allowing to increase the system zones. Up to 8 units can be connected in order to reach a maximum of 54 manageable zones. It offers the possibility to either share the main unit music programme or insert a local source. As the system’s main units, also ZE 2200 is based on a dual bus architecture, where the first bus is mainly dedicated for selective / all-call paging, while the second bus is for music distribution (or other signals).