Means a single piece of equipment, except in the case where more than one piece of equipment is needed to make an entire system functional such as a computer or telephone system. (For example, when purchasing a computer, the monitor, keyboard, printer, and hard drive are all to be considered as a component of the total system, with the total system defined as a unit of property. Likewise, with a telephone system the switchboard along with all phones required to make up the system shall be considered the unit of property. After initial acquisition of such a system, any component part upon replacement shall be considered as a single unit of property for that type of transaction.)