A phone network is a telecommunication network that is used for the communication between two or more parties. This may be a wired network or a wireless network. There are different types of telephone networks:
A fixed line network where the telephones are directly wired in a single telephone exchange is known as public switched telephone network or commonly known as PSTN.
A wireless network is a network where the telephones are mobile and can move remotely. In this network there is no wired connection between the mobile phones. In this network the communication is done through microwave in a specific band and the range is also specified by the ITU(International Telecommunication Union).
A private telephone network is a network where a small group of telephones are connected to each other for communication through a gateway which connects the network to the out side world. This is basically used in a company where a good number of telephones are needed to communicate between each other, in a call center. This is called Private Branch Exchange (PBX).
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