1.
Country calling code
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Country calling codes or country dial in codes are telephone dialing prefixes for the member countries of the International Telecommunication Union. They are defined by the ITU-T in standards E.123, the prefixes enable international direct dialing, and are also referred to as international subscriber dialing codes. Country codes are a component of the telephone numbering plan. Country codes are dialed before the telephone number. For example, the call prefix in all countries belonging to the North American Numbering Plan is 011. On GSM networks, the prefix may automatically be inserted when the user prefixes a dialed number with the plus sign, Country calling codes are prefix codes, hence, they can be organized as a tree. In each row of the table below, the country codes given in the left-most column share the same first digit, while there is a general geographic grouping to the zones, some exceptions exist for political and historical reasons. Thus, the geographical indicators below are approximations only, countries within NANP administered areas are assigned area codes as if they were all within one country. The codes below in format +1 XXX represent area code XXX within the +1 NANP zone – not a country code. Small countries, such as Iceland, were assigned three-digit codes, since the 1980s, all new assignments have been three-digit regardless of countries’ populations.164 assigned country codes as of 15 November 2016. List of ITU-T Recommendation E.164 Dialling Procedures as of 15 December 2011, complement to Recommendation ITU-T E.164 - List of Recommendation ITU-T E.164 Assigned Country Codes. Telephone and Internet Country Codes in 10 Languages
2.
North American Numbering Plan
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The North American Numbering Plan is a telephone numbering plan that encompasses 25 distinct regions in twenty countries primarily in North America, including the Caribbean and the U. S. territories. Not all North American countries participate in the NANP, each participating country forms a regulatory authority that has plenary control over local numbering resources. The FCC also serves as the U. S. regulator, Canadian numbering decisions are made by the Canadian Numbering Administration Consortium. The NANP divides the territories of its members into numbering plan areas which are encoded numerically with a telephone number prefix. Each telephone is assigned a telephone number unique only within its respective plan area. The telephone number consists of a central office code and a four-digit station number. The combination of a code and the telephone number serves as a destination routing address in the public switched telephone network. For international call routing, the NANP has been assigned the calling code 1 by the International Telecommunications Union. The North American Numbering Plan conforms with ITU Recommendation E.164, from its beginnings in 1876 and throughout the first part of the 20th century, the Bell System grew from essentially local or regional telephone systems. These systems expanded by growing their subscriber bases, as well as increasing their service areas by implementing additional local exchanges that were interconnected with tie trunks and it was the responsibility of each local administration to design telephone numbering plans that accommodated the local requirements and growth. As a result, the Bell System as a developed into an unorganized system of many differing local numbering systems. The diversity impeded the efficient operation and interconnection of exchanges into a system for long-distance telephone communication. The new numbering plan was accepted in October 1947, dividing most of North America into 86 Numbering Plan Areas. Each NPA was assigned a Numbering Plan Area code, often abbreviated as area code and these codes were first used by long-distance operators to establish long-distance calls between toll offices. The first customer-dialed direct call using area codes was made on November 10,1951, from Englewood, New Jersey, to Alameda, California. Direct distance dialing was introduced across the country and by the early 1960s most areas of the Bell System had been converted and it was commonplace in cities. In the following decades, the system expanded to all of the United States and its territories, Canada, Bermuda. By 1967,129 area codes had been assigned, mexican participation was planned, but implementation stopped after two area codes had been assigned and Mexico opted for an international numbering format, using country code 52
3.
Telephone
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A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. In 1876, Scottish emigrant Alexander Graham Bell was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice and this instrument was further developed by many others. The telephone was the first device in history that people to talk directly with each other across large distances. Telephones rapidly became indispensable to businesses, government, and households, the essential elements of a telephone are a microphone to speak into and an earphone which reproduces the voice in a distant location. Until approximately the 1970s most telephones used a dial, which was superseded by the modern DTMF push-button dial. The receiver and transmitter are usually built into a handset which is held up to the ear, the dial may be located either on the handset, or on a base unit to which the handset is connected. The transmitter converts the sound waves to electrical signals which are sent through the network to the receiving phone. The receiving telephone converts the signals into audible sound in the receiver, telephones permit duplex communication, meaning they allow the people on both ends to talk simultaneously. The first telephones were connected to each other from one customers office or residence to another customers location. Being impractical beyond just a few customers, these systems were replaced by manually operated centrally located switchboards. For greater mobility, various systems were developed for transmission between mobile stations on ships and automobiles in the middle 20th century. Hand-held mobile phone]s was introduced for personal service starting in 1973, by the late 1970s several mobile telephone networks operated around the world. In 1983, the Advanced Mobile Phone System was launched, offering a standardized technology providing portability for users far beyond the residence or office. These analog cellular system evolved into digital networks with better security, greater capacity, better regional coverage, the public switched telephone network, with its hierarchical system of many switching centers, interconnects telephones around the world for communication with each other. With the standardized international numbering system, E.164, each line has an identifying telephone number. Although originally designed for voice communications, convergence has enabled most modern cell phones to have many additional capabilities. Since 1999, the trend for mobile phones is smartphones that integrate all mobile communication, a traditional landline telephone system, also known as plain old telephone service, commonly carries both control and audio signals on the same twisted pair of insulated wires, the telephone line. The control and signaling equipment consists of three components, the ringer, the hookswitch, and a dial, the ringer, or beeper, light or other device, alerts the user to incoming calls
4.
Bermuda
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Bermuda is a British Overseas Territory in the North Atlantic Ocean. It is approximately 1,070 km east-southeast of Cape Hatteras, North Carolina,1,236 km south of Cape Sable Island, Nova Scotia, Bermuda is an associate member of Caribbean Community. The first person known to have reached Bermuda was the Spanish sea captain Juan de Bermúdez in 1503 and he claimed the islands for the Spanish Empire. Bermúdez never landed on the islands, but made two visits to the archipelago, of which he created a recognisable map, shipwrecked Portuguese mariners are now thought to have been responsible for the 1543 inscription on Portuguese Rock. Subsequent Spanish or other European parties are believed to have released pigs there, the island was administered as an extension of Virginia by the Company until 1614. Its spin-off, the Somers Isles Company, took over in 1615, at that time, the companys charter was revoked, and the English Crown took over administration. The islands became a British colony following the 1707 unification of the parliaments of Scotland and England, after 1949, when Newfoundland became part of Canada, Bermuda became the oldest remaining British Overseas Territory. Since the return of Hong Kong to China in 1997, it is the most populous Territory and its first capital, St. Georges, was established in 1612 and is the oldest continuously inhabited English town in the New World. Bermudas economy is based on insurance and reinsurance, and tourism. Bermuda had one of the worlds highest GDP per capita for most of the 20th century, recently, its economic status has been affected by the global recession. The island is in the belt and prone to severe weather. However, it is protected from the full force of a hurricane by the coral reef that surrounds the island. It is 898 nautical miles northeast of Miami, Florida, and 667 nautical miles from Cape Sable Island, in Nova Scotia, Canada. The islands lie due east of Fripp Island, South Carolina, west-northwest of Cape Verde, southeast of New York City, New York, north-northwest of Brazil and north of San Juan, Puerto Rico. The archipelago is formed by points on the rim of the caldera of a submarine volcano that forms a seamount. The volcano is one part of a range that was formed as part of the process that formed the floor of the Atlantic. It has 103 km of coastline, the two incorporated municipalities in Bermuda are the City of Hamilton and the Town of St George. Bermuda is divided into nine parishes, which have some localities called villages, such as Flatts Village, although usually referred to in the singular, the territory consists of 181 islands, with a total area of 53.3 square kilometres
5.
Radio
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When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form, Radio systems need a transmitter to modulate some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation. Radio systems also need an antenna to convert electric currents into radio waves, an antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected, the electromagnetic wave is intercepted by a tuned receiving antenna. Radio frequencies occupy the range from a 3 kHz to 300 GHz, a radio communication system sends signals by radio. The term radio is derived from the Latin word radius, meaning spoke of a wheel, beam of light, however, this invention would not be widely adopted. The switch to radio in place of wireless took place slowly and unevenly in the English-speaking world, the United States Navy would also play a role. Although its translation of the 1906 Berlin Convention used the terms wireless telegraph and wireless telegram, the term started to become preferred by the general public in the 1920s with the introduction of broadcasting. Radio systems used for communication have the following elements, with more than 100 years of development, each process is implemented by a wide range of methods, specialised for different communications purposes. Each system contains a transmitter, This consists of a source of electrical energy, the transmitter contains a system to modulate some property of the energy produced to impress a signal on it. This modulation might be as simple as turning the energy on and off, or altering more subtle such as amplitude, frequency, phase. Amplitude modulation of a carrier wave works by varying the strength of the signal in proportion to the information being sent. For example, changes in the strength can be used to reflect the sounds to be reproduced by a speaker. It was the used for the first audio radio transmissions. Frequency modulation varies the frequency of the carrier, the instantaneous frequency of the carrier is directly proportional to the instantaneous value of the input signal. FM has the capture effect whereby a receiver only receives the strongest signal, Digital data can be sent by shifting the carriers frequency among a set of discrete values, a technique known as frequency-shift keying. FM is commonly used at Very high frequency radio frequencies for high-fidelity broadcasts of music, analog TV sound is also broadcast using FM. Angle modulation alters the phase of the carrier wave to transmit a signal
6.
Broadcasting
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Broadcasting began with AM radio, which came into popular use around 1920 with the spread of vacuum tube radio transmitters and receivers. Before this, all forms of communication were one-to-one, with the message intended for a single recipient. Over the air broadcasting is usually associated with radio and television, the receiving parties may include the general public or a relatively small subset, the point is that anyone with the appropriate receiving technology and equipment can receive the signal. The field of broadcasting includes both government-managed services such as radio, community radio and public television, and private commercial radio. The U. S. Code of Federal Regulations, title 47, part 97 defines broadcasting as transmissions intended for reception by the general public, private or two-way telecommunications transmissions do not qualify under this definition. For example, amateur and citizens band radio operators are not allowed to broadcast, as defined, transmitting and broadcasting are not the same. Transmissions using a wire or cable, like television, are also considered broadcasts. In the 2000s, transmissions of television and radio programs via streaming digital technology have increasingly been referred to as broadcasting as well, the earliest broadcasting consisted of sending telegraph signals over the airwaves, using Morse code, a system developed in the 1830s by Samuel F. B. Morse, physicist Joseph Henry and Alfred Vail and they developed an electrical telegraph system which sent pulses of electric current along wires which controlled an electromagnet that was located at the receiving end of the telegraph system. A code was needed to transmit natural language using only these pulses, Morse therefore developed the forerunner to modern International Morse code. Audio broadcasting began experimentally in the first decade of the 20th century, by the early 1920s radio broadcasting became a household medium, at first on the AM band and later on FM. Television broadcasting started experimentally in the 1920s and became widespread after World War II, satellite broadcasting was initiated in the 1960s and moved into general industry usage in the 1970s, with DBS emerging in the 1980s. Originally all broadcasting was composed of signals using analog transmission techniques but in the 2000s. In general usage, broadcasting most frequently refers to the transmission of information, Analog audio vs. HD Radio Analog television vs.9 zettabytes. This is the equivalent of 55 newspapers per person per day in 1986. Historically, there have been several methods used for broadcasting electronic media audio and/or video to the public, Telephone broadcasting. Telephone broadcasting also grew to include telephone services for news and entertainment programming which were introduced in the 1890s. These telephone-based subscription services were the first examples of electrical/electronic broadcasting, Radio broadcasting, audio signals sent through the air as radio waves from a transmitter, picked up by an antenna and sent to a receiver
This article incorporates public domain material from the CIA World Factbook website https://www.cia.gov/library/publications/the-world-factbook/index.html.
