Telephone

See also: List of telephone operating companies. In this system, the material that constitutes the money itself had very little intrinsic value, but none the less such money achieves significant market value through being scarce as an artifact. However, the list only includes providers of copper wires from the exchange to the user, not those who only supply "Voice over IP" or only transport voice signals between exchanges. The system of commodity money in many instances evolved into a system of representative money. Some of them include those in the following list. Ancient Sparta minted coins from iron to discourage its citizens from engaging in foreign trade. In some countries, many telephone operating companies (commonly abbreviated to telco) are in competition to provide telephone services. Numismatists have examples of coins from the earliest large-scale societies, although these were initially unmarked lumps of precious metal^[2].

Bell Labs is a noted telephone equipment research laboratory, amongst its other research fields. This first stage of currency, where metals were used to represent stored value, and symbols to represent commodities, formed the basis of trade in the Fertile Crescent for over 1500 years. As mentioned above VoIP is also used on private wireless networks which may or may not have a connection to the outside telephone network. Currency was introduced as a standardized money to facilitate a wider exchange of goods and services. In addition to replacing the PSTN, digital telephony is also competing with mobile phone networks by offering free or lower cost connections via WiFi hotspots. [1]. Digital telephones use a broadband Internet connection to transmit conversations as data packets. In Mexico under Montezuma cocoa beans were money.

A recent Newsweek article suggested that Internet telephony may be "the next big thing." [2]. In medieval Iraq, bread was used as an early form of money. In Japan and Korea up to 10% of subscribers, as of January 2005, have switched from analog to digital telephone service. This is called commodity money and includes any commonly-available commodity that has intrinsic value; historical examples include pigs, rare seashells, whale's teeth, and (often) cattle. Also known as Internet telephony or Voice over IP (VoIP), digital telephony is a disruptive technology that is rapidly replacing traditional telephone networks. The first instances of money were objects with intrinsic value. These kinds of systems using VoIP are popular in hospitals and factories where the same wireless network can be used for both data and voice. Main article: History of money.

Some kinds of cordless phones work like cellular phones but only within a small private network covering a building or group of buildings. Free trade advanced further in the late 20th century and early 2000s:. There are phones that work as a cordless phone when near their corresponding base station (and sometimes other base stations) and work as a wireless phone when in other locations but for a variety of reasons did not become popular. In 1947, 23 countries agreed to the General Agreement on Tariffs and Trade to promote free trade. Such devices tend to be bulkier than cell-based mobile phones, as they require a large antenna or dish for communicating with the satellite, but do not require ground based transmitters, making them useful for communicating from remote areas and disaster zones. These organizations became operational in 1946 after enough countries ratified the agreement. Some mobile telephones, especially those used in remote locations, where constructing a cell network would be too unprofitable or difficult, instead communicate directly with an orbiting satellite. It set up rules and institutions to regulate the international political economy: the International Monetary Fund and the International Bank for Reconstruction and Development (later divided into the World Bank and Bank for International Settlements).

The higher frequencies also work well with various forms of multiplexing which allows more than one phone to connect to the same tower with the same set of frequencies. During the war, in 1944, 44 countries signed the Bretton Woods Agreement, intended to prevent national trade barriers, to avoid depressions. By only using enough power to connect to the "nearest" cell site phones using one cell site will cause almost no interference with phones using the same frequencies on another cell site. The lack of free trade was considered by many as a principal cause of the depression, and World War II. Connection distance is somewhat predictable and can be controlled by adjusting the power level. During this period, there was a great drop in trade and other economic indicators. The higher frequencies used by cell phones have advantages over short distances. The Great Depression was a major economic recession that ran from 1929 to 1941.

Radio frequencies are a limited, shared resource. This became the policy in many countries attempting to industrialize and out-compete English exporters. When a handset gets too far from a cell site, a computer system commands the handset and a closer cell site to take up the communications on a different channel without interrupting the call. This was followed within a few years by the infant industry scenario developed by Mill anticipated New Trade Theory by promoting the theory that government had the "duty" to protect young industries, although only for a time necessary for them to develop full capacity. Radio is used to communicate between a handset and nearby cell sites. This was taken as evidence against the universal doctrine of free trade, as it was believed that more of the economic surplus of trade would accrue to a country following reciprocal, rather than completely free, trade policies. Most modern mobile phone systems are cell-structured. Ricardo and others had suggested this earlier.

The range of modern cordless phones is normally on the order of a few hundred meters. John Stuart Mill proved that a country with monopoly pricing power on the international market could manipulate the terms of trade through maintaining tariffs, and that the response to this might be reciprocity in trade policy. On the 2.4 GHz band, several "channels" are utilized in an attempt to guard against degradation in the quality of the voice signal due to crowding. That is, the calculation made was whether it was in any particular country's self-interest to open its borders to imports. The 2.4 GHz cordless phones can interfere with certain wireless LAN protocols (802.11b/g) due to the usage of the same frequencies. The ascendancy of free trade was primarily based on national advantage in the mid 19th century. Because of quality and range problems, these units were soon superseded by systems that used frequency modulation (FM) at higher frequency ranges (49 MHz, 900 MHz, 2.4 GHz, and 5.8 GHz). In Principles of Political Economy and Taxation Ricardo advanced the doctrine still considered the most counterintuitive in economics:.

Initially, cordless phones used the 1.7 MHz frequency range to communicate between base and handset. In 1817, David Ricardo, James Mill and Robert Torrens showed that free trade might benefit the industrially weak as well as the strong, in the famous theory of comparative advantage. Thus, cordless phones typically do not function during power outages. In 1799, the Dutch East India Company, formerly the world's largest company, became bankrupt, partly due to the rise of competitive free trade. Because of the power required to transmit to the handset, the base station is powered with an electronic power supply. Smith said that he considered all rationalizations of import and export controls "dupery", which hurt the trading nation at the expense of specific industries. This permits use of the handset from any location within range of the base. Since the division of labour was restricted by the size of the market, he said that countries having access to larger markets would be able to divide labour more efficiently and thereby become more productive.

Cordless telephones, first invented by Teri Pall in 1965, consist of a base unit that connects to the land-line system and also communicates with remote handsets by low power radio. It criticised Mercantilism, and argued that economic specialization could benefit nations just as much as firms. The changes in terminology is partially due to providers using different terms in marketing to differentiate newer digital services from older analog systems and services of one company from another. In 1776, Adam Smith published the paper An Inquiry into the Nature and Causes of the Wealth of Nations. In the United States wireless companies tend to use the term wireless to refer to a wide range of services while the cell phone itself is called a mobile phone, mobile, PCS phone, cell phone or simply cell with the trend now moving towards mobile. Trade in the East Indies was dominated by Portugal in the 16th century, the Netherlands in the 17th century, and the British in the 18th century. While the term "wireless" means radio and can refer to any telephone that uses radio waves it is primarily used for cell phones. In the 16th century, Holland was the centre of free trade, imposing no exchange controls, and advocating the free movement of goods.

Digital loop carriers (DLC) are often used, placing the digital network ever closer to the customer premises, relegating the analog local loop to legacy status. Spices brought to Europe from distant lands were some of the most valuable commodities for their weight, sometimes rivaling gold. While today the end instrument remains analog, the analog signals reaching the aggregation point (Serving Area Interface (SAI) or the central office (CO) ) are typically converted to digital signals. The spice trade was of major economic importance and helped spur the Age of Exploration. Digital transmission made it possible to carry multiple digitized switched circuits on a single transmission medium (known as multiplexing). Vasco da Gama started the Spice trade in 1498. End-to-end analog telephone networks were first modified in the 1970s by upgrading long-haul transmission networks with SONET technology and fiber optic transmission methods. The Hanseatic League was an alliance of trading cities that maintained a trade monopoly over most of Northern Europe and the Baltic, between the 13th and 17th centuries.

The Public Switched Telephone Network (PSTN) has gradually evolved towards digital telephony which has improved the capacity and quality of the network. Vikings sailed to Western Europe, while Varangians to Russia. The first commercial transatlantic telephone call was between New York City and London and occurred on January 7, 1927. From the 8th to the 11th century, the Vikings and Varangians traded as they sailed from and to Scandinavia. In 1926 Bell Labs and the British Post Office engineered the first two-way conversation across the Atlantic. For instance, Radhanites were a medieval guild or group (the precise meaning of the word is lost to history) of Jewish merchants who traded between the Christians in Europe and the Muslims of the Near East. The Bell System divested itself of the local telephone companies in 1984 in order to settle an antitrust suit brought against it by the United States Department of Justice. Nevertheless some trade did occur.

It fully or partially owned the telephone companies that provided service to about 80% of the telephones in the country and also owned Western Electric, which manufactured or purchased virtually all the equipment and supplies used by the local telephone companies. The fall of the Roman empire, and the succeeding Dark Ages brought instability to Western Europe and a near collapse of the trade network. In the United States, the Bell System was vertically integrated. Their widespread empire produced a stable and secure transportation network that enabled the shipment of trade goods without fear of significant piracy. Operating companies often hold a national monopoly. Roman commerce allowed their empire to flourish and endure. The industry has divided into telephone equipment manufacturers and telephone network operators (telcos). From the beginning of Greek civilization until the fall of the Roman empire in the 5th century, a financially lucrative trade brought valuable spice to Europe from the far east, including China.

Newer systems include IP telephony, ISDN, DSL, mobile cellular phone systems, cordless telephones, and the third generation cell phone systems that promise to include high-speed packet data transfer. For this purpose they established trade colonies the Greeks called emporia. The history of additional inventions and improvements of the electrical telephone includes the carbon microphone (later replaced by the electret microphone now used in almost all telephone transmitters), the manual switchboard, the rotary dial, the automatic telephone exchange, the computerized telephone switch, Touch Tone® dialing (DTMF), and the digitization of sound using different coding techniques including pulse code modulation or PCM (which is also used for .WAV, .AIF files and compact discs). The Phoenicians were noted sea traders, travelling across the Mediterranean Sea, and as far north as Britain for sources of tin to manufacture bronze. The following is a brief summary of the history of the invention of the telephone:. Long-range trade routes first appeared in the 3rd millennium BCE, when Sumerians in Mesopotamia traded with the Harappan civilization of the Indus Valley. The modern telephone is the result of work done by many hands, all worthy of recognition of their addition to the field. Materials used for creating jewelry were traded with Egypt since 3000 BCE.

It is important to note that there is probably no single "inventor of the telephone". There is evidence of the exchange of obsidian and flint during the stone age. Additionally, the earliest investigators preferred publication in the popular press and demonstration to investors instead of scientific publication and demonstration to fellow scientists. Trade is believed to have taken place throughout much of recorded human history. There was a lot of money involved, particularly in the Bell Telephone companies, and the aggressive defense of the Bell patents resulted in much confusion. Peter Watson dates the history of long-distance commerce from circa 150,000 years ago.^[1]. The very early history of the telephone is a confusing morass of claim and counterclaim, which was not clarified by the huge mass of lawsuits which hoped to resolve the patent claims of individuals. Trading was the main facility of prehistoric people, who bartered goods and services from each other.

Antonio Meucci, Johann Philipp Reis, and Alexander Graham Bell, amongst others, have all been credited with the invention. Trade originated with the start of communication in prehistoric time. The identity of the inventor of the electric telephone remains in dispute. . Unlike a mobile phone, a cordless telephone is considered to be landline because it is only useable within a short distance of a small personal or domestic base station connected to a fixed phone line. As such, trade at market prices between locations benefits both locations. Cordless and mobile phones are now common in many places around the world, with mobile phones expected to gradually displace the conventional landline telephone. Trade exists between regions because different regions have a comparative advantage in the production of some tradable commodity, or because different regions' size allows for the benefits of mass production.

Until relatively recently, a "telephone" generally referred only to landlines. Due to specialization and division of labor, most people concentrate on a small aspect of production, trading for other products. Between end users, transmissions across a network may be carried by fiber optic cable, point to point microwave or satellite relay. Trade exists for many reasons. There are four principal means by which an end user using a telephone handset may connect to a telephone network: a traditional fixed phone "landline", which uses dedicated physical wire connections connected to a single location; wireless and radio telephones, which use either analog or digital radio signals; satellite telephones, which utilize telecommunications satellites; and voice over internet protocol (VoIP) telephones, which use broadband internet connections. Trade between two traders is called bilateral trade, while trade between more than two traders is called multilateral trade. . The invention of money (and later credit, paper money and non-physical money) greatly simplified and promoted trade.

Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other. As a result, buying can be separated from selling, or earning. The telephone or phone (Greek: tele = far away and phone = voice) is a telecommunications device which is used to transmit and receive sound (most commonly voice and speech) across distance. Modern traders instead generally negotiate through a medium of exchange, such as money. In Unicode, telephones are depicted with the characters whose hexadecimal codes are 260E (☎), 260F (☏) and 2706 (✆), (but may not display properly in some browsers). The original form of trade was barter, the direct exchange of goods and services. The folding portable phone was an intentional copy of the fictional futuristic communicators (which in use actually more closely resembled walkie-talkies, Nextel-style) used in the television show Star Trek. A mechanism that allows trade is called a market.

The modern handset came into existence when a Swedish lineman tied a microphone and earphone to a stick so he could keep a hand free. Trade is also called commerce. 30 January 1877 Bell patents the electro-dynamic transmitter, receiver telephone. Trade is the voluntary exchange of goods, services, or both. Two hours later Gray files his patent caveat. As of mid-2005, there is a proposal for a Central American Free Trade Agreement, which would also include the United States and the Dominican Republic. 14 February 1876 Bell files his first patent on the telephone.