The public switched telephone network (PSTN) is the network of the world's public circuit-switched In telecommunications, a circuit switching network is one that establishes a circuit between nodes and terminals before the users may communicate, as if the nodes were physically connected with an electrical circuit telephone The telephone is a telecommunications device that transmits and receives sound, most commonly the human voice. It is one of the most common household appliances in the developed world, and has long been considered indispensable to business, industry and government. The word "telephone" has been adapted to many languages and is widely networks. Originally a network of fixed-line It takes a lot to connect dozens or millions of telephones together, including people and hardware. Hardware that stays in place is called "plant." Some items of plant can be centralized and kept indoors in the telephone exchange. This is called Inside plant. Other equipment, such as wires to connect a phone to its exchange, or optical analog An Analog or analogue signal is any continuous signal for which the time varying feature of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. It differs from a digital signal in terms of small fluctuations in the signal which are meaningful. Analog is usually thought of in an telephone systems, the PSTN is now almost entirely digital A digital system is a data technology that uses discrete values. By contrast, non-digital (or analog) systems use a continuous range of values to represent information. Although digital representations are discrete, the information represented can be either discrete, such as numbers, letters or icons, or continuous, such as sounds, images, and in its core and includes mobile A mobile phone or mobile is an electronic device used for mobile telecommunications (mobile telephone, text messaging or data transmission) over a cellular network of specialized base stations known as cell sites. Mobile phones differ from cordless telephones, which only offer telephone service within limited range, e.g. within a home or an office, as well as fixed A landline was originally an overland telegraph wire, as opposed to an undersea cable. Currently, landline (or land phone or main line or fixed-line) refers to a telephone line which travels through a solid medium, either metal wire or optical fibre, as distinguished from a mobile cellular line, where transmission is via radio waves. Landlines (plain old telephone service Plain old telephone service is the voice-grade telephone service that remains the basic form of residential and small business service connection to the telephone network in most parts of the world. The name is a retronym, and is a reflection of the telephone service still available after the advent of more advanced forms of telephony such as ISDN,, POTS) telephones.
The PSTN is largely governed by technical standards created by the ITU-T The Telecommunication Standardization Sector coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland, and uses E.163 E.164 is an ITU-T recommendation which defines the international public telecommunication numbering plan used in the PSTN and some other data networks. It also defines the format of telephone numbers. E.164 numbers can have a maximum of fifteen digits and are usually written with a + prefix. To actually dial such numbers from a normal fixed line/E.164 E.164 is an ITU-T recommendation which defines the international public telecommunication numbering plan used in the PSTN and some other data networks. It also defines the format of telephone numbers. E.164 numbers can have a maximum of fifteen digits and are usually written with a + prefix. To actually dial such numbers from a normal fixed line telephone numbers A telephone number or phone number is a sequence of numbers used to call from one telephone line to another in a public switched telephone network. When telephone numbers were invented, they were short — as few as one, two or three digits — and were given verbally to a switchboard operator. As phone systems have grown and interconnected to for addressing.
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... and a native IP-based facility to manage all traffic between a customer's IP-PBX system, the XO IP network , and the Public Switched Telephone Network . ...
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can commence The best analogy of a circuit switched network is the PSTN Public Switched Telephone Network which requires a set of switches to physically connect two telephones Although mobile phones operate using radio waves the same principle exists in the GSM telephone system Mobile phones require a dedicated circuit switched radio link to the cell base
