Parts are described by partnum, color, and price. Parts can be subassemblies as well and this means that they contain other parts. One part cannot be a component of more than one subassembly but a subassembly can contain many other parts. A part need not be a component of any subassembly (please note that a subassembly is a part well), but a subassembly must contain more than one part.

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What is wi-fi infrastructure? a metropolitan area network that uses radio signals to transmit and receive data a communications technology aimed at providing high-speed wireless data over metropolitan area networks a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves includes the inner workings of a wi-fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a wi-fi signal