Nurse Call System

I have to do a special report on the system of nurse call system. I knew what their types (such as Wireless and12AC/dc and so on), but could not understand how the system of dose, is the type of signal used?, There is now a microprocessor unit involved in the call system basic nursing devices, "What kind of signal is gone? With the use of old systems of direct wiring in the room / bed to call the panel. new versions of wireless systems will be connected by bus, where each has a unit called the unique serial code through a network of buses. I doubt that will be wireless, with the exception of the rooms to call the panel in a bus system, when connected to a wireless pager that personnel assigned to tasks answer a call. In our hospital we have a new system that can locate which room you're in. You can also display the device where it is, ie, the room number of a given space. We bring these markers on the uniforms and equipment when the Secretary receives a call to reception, which pages on our sirens are all connected to the nurse call system very well .