1.
Tricom S.A.
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Tricom, S. A. colloquially known as Tricom, is the second largest landline service provider in the Dominican Republic. It owns and operates a major HDTV Cable TV service, Telecable de Tricom and its ISP branch offers residential bandwidth with speeds up to 100 Mbit/s and is also a national mobile network operator. In 1988, Zona Franca de San Isidro spawned San Isidro Teleport, in 1990, the company had reached an agreement with the Dominican Republic to provide communications services nationwide. On May 20,1992, the company began to implement Long Distance Call Centers, in 1993, Tricom sold Motorola a 40% stake in the company with a goal of improving their local and international infrastructure. On November 17,1994, Tricom and CODETEL connected their telephone exchanges, following is the implementation of pagers, paging services, and mobile products. In 1995 the first long distance prepaid card, Efectiva, was made public, in 1996, Tricom implemented Motorolas Digital Telephone services which allowed installation of residential and business lines in just 48 hours. Amigo, the countrys first prepaid wireless provider, is launched in 1997, meanwhile, TRICOM USA is created to offer long distance services to the Hispanic community in New York City. In 1998, Tricom placed 5,700,000 shares of stock in the New York Stock Exchange. In 1999, the company achieved 300,000 customers, becoming the leader in mobile communications in addition to servicing 68% of the countrys landlines, in 2004, the company was de-listed from the NYSE. On July 4,2012, Tricom announced they were going to begin a build out of a 4G-LTE network, on March 13,2013, Tricom launched a video on demand service, becoming the second Dominican provider after Claro República Dominicana to offer a VOD service. On March 18,2013, Tricom launched their 4G-LTE network, on May 2,2013, Tricom launched their LTE network for mobile phones, becoming the first Dominican provider to offer LTE for mobiles
2.
Wind Telecom
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Wind Telecom S. p. A. is a privately held telecommunications investment company previously 97% controlled by the Sawiris family and now owned by the multinational telecommunications company Veon. Wind Telecom also controls and owns 50% plus one share of Orascom Telecom Holding s. a. e, OTH operates GSM network in Algeria, Bangladesh, Egypt, Iraq, Pakistan and Zimbabwe. OTH had over 56 million subscribers as of March 2007, OTH owns 19. 3% of Hutchinson Telecommunication International, a leading telecommunication services provider operating in eight countries. OTH is traded on the Cairo and Alexandria stock exchange and has GDRs traded on the London Stock Exchange, Wind Telecom subsidiary Global Telecom Holding formerly had an indirect equity ownership in Canadian mobile operator Wind Mobile which had been granted a spectrum license in Canada. The company is now owned by Canadian telecom company Shaw Communications under the name Freedom Mobile. Wind Telecom operates through its subsidiaries Orascom Telecom Holding s. a. e. Wind Telecom is the entry point of choice for both technically advanced attractive markets and high growth, and under penetrated emerging markets. In June 2005, the company bought Wind Telecomunicazioni S. p. A. the third largest Italian mobile phone operator, the telecom operator offers its services under the brand name Wind. Also in June 2005, 50% plus 1 share of Orascom Telecom Holding was transferred to Weather Investments, in 2007 the company acquired the Greek mobile carrier TIM Hellas from Apax Partners and Texas Pacific Group and rebranded it Wind Hellas in a deal worth EUR3.4 billion. Unfortunately, the Greek crisis brought the carrier in deep financial troubles, forcing Sawiris to sell the assets of the company to a group of creditors. The transaction has completed in December 2010. However the Wind brand is used by the Greek carrier. In early 2008 the company acquired the license to operate services in North Korea under the name Koryolink making history by being the first mobile operator there. In January 2011, the decided to change its name. Consequently, the operation gave birth to the 6th largest telecommunication company worldwide, telenor stake has lowered to 31. 7% from 39. 6% and decrease its voting proportion to 25%. Altimo, the main shareholder, had its stake diluted to 31. 4% from 39. 2%. Altimo voting rights has been reduced to 31%
3.
Latin America
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Latin America is a group of countries and dependencies in the Americas where Romance languages are predominant. It is therefore broader than the terms Ibero-America or Hispanic America—though it usually excludes French Canada and it has an area of approximately 19,197,000 km2, almost 13% of the Earths land surface area. As of 2015, its population was estimated at more than 626 million and in 2014, Latin America had a combined nominal GDP of 5,573,397 million USD and a GDP PPP of 7,531,585 million USD. The term Latin America was first used in 1861 in La revue des races Latines, a further investigation of the concept of Latin America is by Michel Gobat in the American Historical Review. The term was first used in Paris in an 1856 conference by the Chilean politician Francisco Bilbao and this term was also used in 1861 by French scholars in La revue des races Latines, a magazine dedicated to the Pan-Latinism movement. Latin America is, therefore, defined as all parts of the Americas that were once part of the Spanish. By this definition, Latin America is coterminous with Ibero-America and this definition emphasizes a similar socioeconomic history of the region, which was characterized by formal or informal colonialism, rather than cultural aspects. As such, some sources avoid this oversimplification by using the phrase Latin America, the distinction between Latin America and Anglo-America is a convention based on the predominant languages in the Americas by which Romance-language and English-speaking cultures are distinguished. Latin America can be subdivided into several subregions based on geography, politics, demographics and it may be subdivided on linguistic grounds into Hispanic America, Portuguese America and French America. *, Not a sovereign state The concept of Latin America has been criticized by a number of intellectuals, the earliest known settlement was identified at Monte Verde, near Puerto Montt in Southern Chile. Its occupation dates to some 14,000 years ago and there is disputed evidence of even earlier occupation. Over the course of millennia, people spread to all parts of the continents, by the first millennium CE, South Americas vast rainforests, mountains, plains and coasts were the home of tens of millions of people. Some groups formed more permanent settlements such as the Chibcha and the Tairona groups and these groups are in the circum Caribbean region. The Chibchas of Colombia, the Quechuas and Aymaras of Bolivia, the region was home to many indigenous peoples and advanced civilizations, including the Aztecs, Toltecs, Maya, and Inca. The Aztec empire was ultimately the most powerful civilization known throughout the Americas, with the arrival of the Europeans following Christopher Columbus voyages, the indigenous elites, such as the Incas and Aztecs, lost power to the heavy European invasion. Hernándo Cortés seized the Aztec elites power with the help of local groups who had favored the Aztec elite, epidemics of diseases brought by the Europeans, such as smallpox and measles, wiped out a large portion of the indigenous population. Historians cannot determine the number of natives who died due to European diseases, due to the lack of written records, specific numbers are hard to verify. Many of the survivors were forced to work in European plantations, intermixing between the indigenous peoples and the European colonists was very common, and, by the end of the colonial period, people of mixed ancestry formed majorities in several colonies
4.
Asymmetric digital subscriber line
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ADSL differs from the less common symmetric digital subscriber line. In ADSL, Bandwidth and bit rate are said to be asymmetric, providers usually market ADSL as a service for consumers for Internet access for primarily downloading content from the Internet, but not serving content accessed by others. ADSL works by using the spectrum above the band used by voice telephone calls. With a DSL filter, often called splitter, the bands are isolated. Data carried by the ADSL are typically routed over the companys data network. There are both technical and marketing reasons why ADSL is in places the most common type offered to home users. On the technical side, there is likely to be more crosstalk from other circuits at the DSLAM end than at the customer premises. Thus the upload signal is weakest at the noisiest part of the local loop and it therefore makes technical sense to have the DSLAM transmit at a higher bit rate than does the modem on the customer end. Since the typical user in fact does prefer a higher download speed. The marketing reasons for a connection are that, firstly. For example, in web browsing, a user will visit a number of web sites and will need to download the data that comprises the web pages from the site, images, text. File sharing applications are an exception to this situation. Secondly internet service providers, seeking to avoid overloading of their connections, have traditionally tried to limit uses such as file sharing which generate a lot of uploads. Currently, most ADSL communication is full-duplex, full-duplex ADSL communication is usually achieved on a wire pair by either frequency-division duplex, echo-cancelling duplex, or time-division duplex. FDD uses two separate bands, referred to as the upstream and downstream bands. The upstream band is used for communication from the end user to the central office. The downstream band is used for communicating from the office to the end user. With commonly deployed ADSL over POTS, the band from 26.075 kHz to 137.825 kHz is used for upstream communication, under the usual DMT scheme, each of these is further divided into smaller frequency channels of 4.3125 kHz
5.
WiMAX
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WiMAX is a family of wireless communication standards based on the IEEE802.16 set of standards, which provide multiple physical layer and Media Access Control options. The forum describes WiMAX as a standards-based technology enabling the delivery of last mile broadband access as an alternative to cable. IEEE802. 16m or WirelessMAN-Advanced was a candidate for the 4G, WiMAX was initially designed to provide 30 to 40 megabit-per-second data rates, with the 2011 update providing up to 1 Gbit/s for fixed stations. WiMAX refers to implementations of the IEEE802.16 family of wireless-networks standards ratified by the WiMAX Forum. The original IEEE802.16 standard was published in 2001, WiMAX adopted some of its technology from WiBro, a service marketed in Korea. Mobile WiMAX is the revision that was deployed in many countries, WiMAX is sometimes referred to as Wi-Fi on steroids and can be used for a number of applications including broadband connections, cellular backhaul, hotspots, etc. It is similar to Long-range Wi-Fi, but it can enable usage at much greater distances, the bandwidth and range of WiMAX make it suitable for the following potential applications, Providing portable mobile broadband connectivity across cities and countries through various devices. Providing a wireless alternative to cable and digital subscriber line for last mile broadband access, Providing data, telecommunications and IPTV services. Providing Internet connectivity as part of a continuity plan. Smart grids and metering WiMAX can provide at-home or mobile Internet access across whole cities or countries, in many cases this has resulted in competition in markets which typically only had access through an existing incumbent DSL operator. Additionally, given the low costs associated with the deployment of a WiMAX network. Mobile WiMAX was a replacement candidate for cellular phone technologies such as GSM and CDMA, fixed WiMAX is also considered as a wireless backhaul technology for 2G, 3G, and 4G networks in both developed and developing nations. In North America, backhaul for urban operations is provided via one or more copper wire line connections. In other regions, urban and rural backhaul is usually provided by microwave links, WiMAX has more substantial backhaul bandwidth requirements than legacy cellular applications. Consequently, the use of wireless microwave backhaul is on the rise in North America, capacities of between 34 Mbit/s and 1 Gbit/s are routinely being deployed with latencies in the order of 1 ms. In many cases, operators are aggregating sites using wireless technology, WiMAX in this application competes with microwave radio, E-line and simple extension of the fiber network itself. WiMAX directly supports the technologies that make triple-play service offerings possible and these are inherent to the WiMAX standard rather than being added on as Carrier Ethernet is to Ethernet. The new company hopes to benefit from combined services offerings and network resources as a springboard past its competitors, the cable companies will provide media services to other partners while gaining access to the wireless network as a Mobile virtual network operator to provide triple-play services
6.
Enhanced Data Rates for GSM Evolution
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Enhanced Data rates for GSM Evolution is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM. EDGE is considered a pre-3G radio technology and is part of ITUs 3G definition, EDGE was deployed on GSM networks beginning in 2003 – initially by Cingular in the United States. EDGE is standardized also by 3GPP as part of the GSM family, a variant, so called Compact-EDGE, was developed for use in a portion of Digital AMPS network spectrum. EDGE can be used for any packet switched application, such as an Internet connection, Evolved EDGE continues in Release 7 of the 3GPP standard providing reduced latency and more than doubled performance e. g. to complement High-Speed Packet Access. Peak bit-rates of up to 1 Mbit/s and typical bit-rates of 400 kbit/s can be expected, eDGE/EGPRS is implemented as a bolt-on enhancement for 2. 5G GSM/GPRS networks, making it easier for existing GSM carriers to upgrade to it. EDGE is a superset to GPRS and can function on any network with GPRS deployed on it, EDGE requires no hardware or software changes to be made in GSM core networks. EDGE-compatible transceiver units must be installed and the base station needs to be upgraded to support EDGE. If the operator already has this in place, which is often the case today, today EDGE is supported by all major chip vendors for both GSM and WCDMA/HSPA. In addition to Gaussian minimum-shift keying, EDGE uses higher-order PSK/8 phase shift keying for the five of its nine modulation. EDGE produces a 3-bit word for every change in carrier phase and this effectively triples the gross data rate offered by GSM. It introduces a new technology not found in GPRS, Incremental Redundancy and this increases the probability of correct decoding. EDGE can carry a bandwidth up to 236 kbit/s for 4 timeslots in packet mode and this means it can handle four times as much traffic as standard GPRS. EDGE meets the International Telecommunications Unions requirement for a 3G network and it also enhances the circuit data mode called HSCSD, increasing the data rate of this service. In GPRS, the Coding Schemes CS-1 to CS-4 specify the number of parity bits generated by the cyclic code, in GPRS Coding Schemes CS-1 through CS-3, the convolutional code is of rate 1/2, i. e. each input bit is converted into two coded bits. In Coding Schemes CS-2 and CS-3, the output of the code is punctured to achieve the desired code rate. In GPRS Coding Scheme CS-4, no coding is applied. In EGPRS/EDGE, the Modulation and Coding Schemes MCS-1 to MCS-9 take the place of the Coding Schemes of GPRS, MCS-1 through MCS-4 use GMSK and have performance similar to GPRS, while MCS-5 through MCS-9 use 8PSK. In all EGPRS Modulation and Coding Schemes, a code of rate 1/3 is used
7.
Evolution-Data Optimized
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Evolution-Data Optimized is a telecommunications standard for the wireless transmission of data through radio signals, typically for broadband Internet access. EV-DO is an evolution of the CDMA2000 standard that supports data rates. It uses advanced multiplexing techniques including code division multiple access as well as time division multiplexing to maximize throughput and it is a part of the CDMA2000 family of standards and has been adopted by many mobile phone service providers around the world particularly those previously employing CDMA networks. It is also used on the Globalstar satellite phone network, EV-DO service has been or will be discontinued in much of Canada in 2015. An EV-DO channel has a bandwidth of 1.25 MHz, the channel structure, on the other hand, is very different. Additionally, the network is entirely packet-based, and thus is not constrained by the restrictions typically present on a circuit switched network. The EV-DO feature of CDMA2000 networks provides access to devices with forward link air interface speeds of up to 2.4 Mbit/s with Rel.0. The reverse link rate for Rel.0 can operate up to 153 kbit/s, a can operate at up to 1.8 Mbit/s. It was designed to be operated end-to-end as an IP based network, there have been several revisions of the standard, starting with Release 0. This was later expanded upon with Revision A to support Quality of Service and higher rates on the forward link, later in 2006 Revision B was published, that among other features includes the ability to bundle multiple carriers to achieve even higher rates and lower latencies. B involves a software update to the cell site modem, existing cdma2000 operators may also have to retune some of their existing 1xRTT channels to other frequencies, since Rev. B requires all DO carriers be within 5 MHz, initially, the standard was called High Data Rate, but was renamed to 1xEV-DO after it was ratified by the International Telecommunication Union under the designation TIA-856. Originally, 1xEV-DO stood for 1x Evolution-Data Only, referring to its being an evolution of the 1x air interface standard. The title of the 1xEV-DO standard document is cdma2000 High Rate Packet Data Air Interface Specification, as cdma2000 is another name for the 1x standard, numerically designated as TIA-2000. Later, likely due to the negative connotations of the word only. So EV-DO now stands for Evolution-Data Optimized, the 1x prefix has been dropped by many of the major carriers, and is marketed simply as EV-DO. This provides a more marketing-friendly emphasis that the technology was optimized for data, the primary characteristic that differentiates an EV-DO channel from a 1xRTT channel is that it is time multiplexed on the forward link. This means that a mobile has full use of the forward traffic channel within a particular geographic area during a given slot of time
8.
UMTS
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The Universal Mobile Telecommunications System is a third generation mobile cellular system for networks based on the GSM standard. UMTS uses wideband code division multiple access radio access technology to offer greater spectral efficiency, UMTS specifies a complete network system, which includes the radio access network, the core network and the authentication of users via SIM cards. The technology described in UMTS is sometimes referred to as Freedom of Mobile Multimedia Access or 3GSM. Unlike EDGE and CDMA2000, UMTS requires new base stations and new frequency allocations, UMTS supports maximum theoretical data transfer rates of 42 Mbit/s when Evolved HSPA is implemented in the network. Users in deployed networks can expect a transfer rate of up to 384 kbit/s for Release 99 handsets, since 2006, UMTS networks in many countries have been or are in the process of being upgraded with High-Speed Downlink Packet Access, sometimes known as 3. 5G. Currently, HSDPA enables downlink transfer speeds of up to 21 Mbit/s, work is also progressing on improving the uplink transfer speed with the High-Speed Uplink Packet Access. The first national consumer UMTS networks launched in 2002 with a emphasis on telco-provided mobile applications such as mobile TV. UMTS combines three different terrestrial air interfaces, GSMs Mobile Application Part core, and the GSM family of speech codecs, the air interfaces are called UMTS Terrestrial Radio Access. All air interface options are part of ITUs IMT-2000, in the currently most popular variant for cellular mobile telephones, W-CDMA is used. Please note that the terms W-CDMA, TD-CDMA and TD-SCDMA are misleading, while they suggest covering just a channel access method, they are actually the common names for the whole air interface standards. W-CDMA or WCDMA, along with UMTS-FDD, UTRA-FDD, or IMT-2000 CDMA Direct Spread is an air interface found in 3G mobile telecommunications networks. W-CDMA uses the DS-CDMA channel access method with a pair of 5 MHz wide channels, in contrast, the competing CDMA2000 system uses one or more available 1.25 MHz channels for each direction of communication. W-CDMA systems are criticized for their large spectrum usage, which delayed deployment in countries that acted relatively slowly in allocating new frequencies specifically for 3G services. The specific frequency bands originally defined by the UMTS standard are 1885–2025 MHz for the mobile-to-base, in the US, 1710–1755 MHz and 2110–2155 MHz are used instead, as the 1900 MHz band was already used. Some carriers such as T-Mobile use band numbers to identify the UMTS frequencies, in the late 1990s, W-CDMA was developed by NTT DoCoMo as the air interface for their 3G network FOMA. Later NTT DoCoMo submitted the specification to the International Telecommunication Union as a candidate for the international 3G standard known as IMT-2000. The ITU eventually accepted W-CDMA as part of the IMT-2000 family of 3G standards, as an alternative to CDMA2000, EDGE, later, W-CDMA was selected as an air interface for UMTS. As NTT DoCoMo did not wait for the finalisation of the 3G Release 99 specification, however, this has been resolved by NTT DoCoMo updating their network
9.
High Speed Packet Access
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A further improved 3GPP standard, Evolved High Speed Packet Access, was released late in 2008 with subsequent worldwide adoption beginning in 2010. The newer standard allows bit-rates to reach as high as 337 Mbit/s in the downlink and 34 Mbit/s in the uplink, however, these speeds are rarely achieved in practice. The first HSPA specifications supported increased peak data rates of up to 14 Mbit/s in the downlink and 5.76 Mbit/s in the uplink. It also reduced latency and provided up to five times more capacity in the downlink. HSDPA has been introduced with 3GPP Release 5, which accompanies a improvement on the uplink providing a new bearer of 384 kbit/s. The previous maximum bearer was 128 kbit/s, as well as improving data rates, HSDPA also decreases latency and so the round trip time for applications. HSPA+ introduced in 3GPP Release 7 further increases data rates by adding 64QAM modulation, MIMO and Dual-Cell HSDPA operation, even higher speeds of up to 337.5 Mbit/s are possible with Release 11 of the 3GPP standards. The first phase of HSDPA has been specified in the 3GPP release 5, phase one introduces new basic functions and is aimed to achieve peak data rates of 14.0 Mbit/s with significantly reduced latency. The improvement in speed and latency reduces the cost per bit, further new features are the High Speed Downlink Shared Channels, the adaptive modulation QPSK and 16QAM and the High Speed Medium Access protocol in base station. The upgrade to HSDPA is often just an update for WCDMA networks. In general voice calls are prioritized over data transfer. The following table is derived from table 5. 1a of the release 11 of 3GPP TS25.306 and shows maximum data rates of different device classes and by what combination of features they are achieved. The per-cell per-stream data rate is limited by the Maximum number of bits of an HS-DSCH transport block received within an HS-DSCH TTI, so for example Cat 10 can decode 27952 bits/2 ms =13.976 MBit/s. Categories 1-4 and 11 have inter-TTI intervals of 2 or 3, Dual-Cell and MIMO 2x2 each multiply the maximum data rate by 2, because multiple independent transport blocks are transmitted over different carriers or spatial streams, respectively. The data rates given in the table are rounded to one decimal point, further UE categories were defined from 3GGP Release 7 onwards as Evolved HSPA and are listed in Evolved HSDPA UE Categories. Notes, As of 28 August 2009,250 HSDPA networks have commercially launched mobile services in 109 countries. 169 HSDPA networks support 3.6 Mbit/s peak downlink data throughput, a growing number are delivering 21 Mbit/s peak data downlink and 28 Mbit/s. CDMA2000-EVDO networks had the lead on performance, and Japanese providers were highly successful benchmarks for it
10.
Wi-Fi
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Wi-Fi or WiFi is a technology for wireless local area networking with devices based on the IEEE802.11 standards. Wi-Fi is a trademark of the Wi-Fi Alliance, which restricts the use of the term Wi-Fi Certified to products that successfully complete interoperability certification testing. Devices that can use Wi-Fi technology include personal computers, video-game consoles, smartphones, digital cameras, tablet computers, digital audio players, Wi-Fi compatible devices can connect to the Internet via a WLAN network and a wireless access point. Such an access point has a range of about 20 meters indoors, hotspot coverage can be as small as a single room with walls that block radio waves, or as large as many square kilometres achieved by using multiple overlapping access points. Wi-Fi most commonly uses the 2.4 gigahertz UHF and 5 gigahertz SHF ISM radio bands, having no physical connections, it is more vulnerable to attack than wired connections, such as Ethernet. In 1971, ALOHAnet connected the Hawaiian Islands with a UHF wireless packet network, ALOHAnet and the ALOHA protocol were early forerunners to Ethernet, and later the IEEE802.11 protocols, respectively. A1985 ruling by the U. S. Federal Communications Commission released the ISM band for unlicensed use and these frequency bands are the same ones used by equipment such as microwave ovens and are subject to interference. In 1991, NCR Corporation with AT&T Corporation invented the precursor to 802.11, the first wireless products were under the name WaveLAN. They are the credited with inventing Wi-Fi. In 1992 and 1996, CSIRO obtained patents for a method used in Wi-Fi to unsmear the signal. The first version of the 802.11 protocol was released in 1997 and this was updated in 1999 with 802. 11b to permit 11 Mbit/s link speeds, and this proved to be popular. In 1999, the Wi-Fi Alliance formed as an association to hold the Wi-Fi trademark under which most products are sold. Wi-Fi uses a number of patents held by many different organizations. In April 2009,14 technology companies agreed to pay CSIRO $1 billion for infringements on CSIRO patents and this led to Australia labeling Wi-Fi as an Australian invention, though this has been the subject of some controversy. In 2016, the local area network Test Bed was chosen as Australias contribution to the exhibition A History of the World in 100 Objects held in the National Museum of Australia. The name Wi-Fi, commercially used at least as early as August 1999, was coined by the brand-consulting firm Interbrand, the Wi-Fi Alliance had hired Interbrand to create a name that was a little catchier than IEEE802. 11b Direct Sequence. Phil Belanger, a member of the Wi-Fi Alliance who presided over the selection of the name Wi-Fi, has stated that Interbrand invented Wi-Fi as a pun upon the word hi-fi. Interbrand also created the Wi-Fi logo, the yin-yang Wi-Fi logo indicates the certification of a product for interoperability
11.
Santo Domingo
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Santo Domingo, officially Santo Domingo de Guzmán, is the capital and largest city in the Dominican Republic and the largest metropolitan area in the Caribbean by population. In 2010, its population was counted as 965,040, the city is coterminous with the boundaries of the Distrito Nacional, itself bordered on three sides by Santo Domingo Province. Santo Domingo is the site of the first university, cathedral, castle, monastery, the citys Colonial Zone was declared as a World Heritage Site by UNESCO. Santo Domingo was called Ciudad Trujillo, from 1936 to 1961, after the Dominican Republics dictator, Rafael Trujillo, following his assassination, the city resumed its original designation. Santo Domingo is the cultural, financial, political, commercial and industrial center of the Dominican Republic, Santo Domingo also serves as the chief seaport of the country. The citys harbor at the mouth of the Ozama River accommodates the largest vessels, temperatures are high year round, with a cool breeze around winter time. At the time, the territory consisted of five chiefdoms, Marién, Maguá, Maguana, Jaragua. These were ruled respectively by caciques Guacanagarix, Guarionex, Caonabo, Bohechío, dating from 1496, when the Spanish settled on the island, and officially from 5 August 1498, Santo Domingo became the oldest European city in the Americas. Bartholomew Columbus founded the settlement and named it La Nueva Isabela, in 1495 it was renamed Santo Domingo, in honor of Saint Dominic. Santo Domingo came to be known as the Gateway to the Caribbean, in June 1502, Santo Domingo was destroyed by a major hurricane, and the new Governor Nicolás de Ovando had it rebuilt on a different site on the other side of the Ozama River. The original layout of the city and a portion of its defensive wall can still be appreciated today throughout the Colonial Zone. Diego Colon arrived in 1509, assuming the powers of Viceroy, in 1512, Ferdinand established a Real Audiencia with Juan Ortiz de Matienzo, Marcelo de Villalobos, and Lucas Vazquez de Ayllon appointed as judges of appeal. In 1514, Pedro Ibanez de Ibarra arrived with the Laws of Burgos, rodrigo de Alburquerque was named repartidor de indios and soon named visitadores to enforce the laws. In 1586, Francis Drake captured the city and held it for ransom, an expedition sent by Oliver Cromwell in 1655 attacked the city of Santo Domingo, but was defeated. The English troops withdrew and took the less guarded colony of Jamaica, in 1697, the Treaty of Ryswick included the acknowledgement by Spain of Frances dominion over the Western third of the island, now Haiti. From 1795 to 1822 the city changed several times along with the colony it headed. The city was ceded to France in 1795 after years of struggles, it was captured by Haitian rebels in 1801, recovered by France in 1802. In 1821 Santo Domingo became the capital of an independent nation after the Criollo bourgeois within the country, led by José Núñez de Cáceres, the nation was unified with Haiti just two months later
12.
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
13.
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
14.
Television
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Television or TV is a telecommunication medium used for transmitting moving images in monochrome, or in color, and in two or three dimensions and sound. The term can refer to a set, a television program. Television is a medium for entertainment, education, news, politics, gossip. Television became available in experimental forms in the late 1920s. After World War II, a form of black-and-white TV broadcasting became popular in the United States and Britain, and television sets became commonplace in homes, businesses. During the 1950s, television was the medium for influencing public opinion. In the mid-1960s, color broadcasting was introduced in the US, for many reasons, the storage of television and video programming now occurs on the cloud. At the end of the first decade of the 2000s, digital television transmissions greatly increased in popularity, another development was the move from standard-definition television to high-definition television, which provides a resolution that is substantially higher. HDTV may be transmitted in various formats, 1080p, 1080i, in 2013, 79% of the worlds households owned a television set. Most TV sets sold in the 2000s were flat-panel, mainly LEDs, major manufacturers announced the discontinuation of CRT, DLP, plasma, and even fluorescent-backlit LCDs by the mid-2010s. In the near future, LEDs are gradually expected to be replaced by OLEDs, also, major manufacturers have announced that they will increasingly produce smart TVs in the mid-2010s. Smart TVs with integrated Internet and Web 2.0 functions became the dominant form of television by the late 2010s, Television signals were initially distributed only as terrestrial television using high-powered radio-frequency transmitters to broadcast the signal to individual television receivers. Alternatively television signals are distributed by cable or optical fiber, satellite systems and. Until the early 2000s, these were transmitted as analog signals, a standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals. A visual display device which lacks a tuner is correctly called a video monitor rather than a television, the word television comes from Ancient Greek τῆλε, meaning far, and Latin visio, meaning sight. The Anglicised version of the term is first attested in 1907 and it was. formed in English or borrowed from French télévision. In the 19th century and early 20th century, other. proposals for the name of a technology for sending pictures over distance were telephote. The abbreviation TV is from 1948, the use of the term to mean a television set dates from 1941
15.
Television set
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A television set, more commonly called a television, TV, TV set, television receiver, or telly, is a device that combines a tuner, display, and loudspeakers for the purpose of viewing television. Introduced in the late 1920s in mechanical form, television became a popular consumer product after World War II in electronic form. The addition of color to broadcast television after 1953 further increased the popularity of television sets in the 1960s, the ubiquitous television set became the display device for the first recorded media in the 1970s, such as Betamax, VHS and later DVD. It was also the display device for the first generation of home computers, in the 2010s flat panel television incorporating liquid-crystal displays, especially LED-backlit LCDs, largely replaced cathode ray tubes and other displays. Modern flat panel TVs are typically capable of display and can also play content from a USB device. Mechanical televisions were sold from 1928 to 1934 in the United Kingdom, United States. The Baird Televisor is considered the first mass-produced television, selling about a thousand units, the first commercially made electronic televisions with cathode ray tubes were manufactured by Telefunken in Germany in 1934, followed by other makers in France, Britain, and America. The cheapest model with a 12-inch screen was $445, an estimated 19,000 electronic televisions were manufactured in Britain, and about 1,600 in Germany, before World War II. About 7, 000–8,000 electronic sets were made in the U. S. before the War Production Board halted manufacture in April 1942, production resuming in August 1945. While only 0. 5% of U. S. households had a television in 1946,55. 7% had one in 1954, and 90% by 1962. In Britain, there were 15,000 television households in 1947,1.4 million in 1952, by the late 1960s and early 1970s, color television had come into wide use. In Britain, BBC1, BBC2 and ITV were regularly broadcasting in colour by 1969, during the first decade of the 21st century, CRT picture tube display technology was almost entirely supplanted worldwide by flat panel displays. By the early 2010s, LCD TVs, which increasingly used LED-backlit LCDs, television sets may employ one of several available display technologies. The production of plasma and CRT displays has been almost completely discontinued, the cathode ray tube is a vacuum tube containing one or more electron guns and a fluorescent screen used to view images. It has a means to accelerate and deflect the beam onto the screen to create the images. The images may represent electrical waveforms, pictures, radar targets or others, the CRT uses an evacuated glass envelope which is large, deep, fairly heavy, and relatively fragile. As a matter of safety, the face is made of thick lead glass so as to be highly shatter-resistant and to block most X-ray emissions. In television sets and computer monitors, the front area of the tube is scanned repetitively and systematically in a fixed pattern called a raster
16.
Cable television
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This contrasts with broadcast television, in which the television signal is transmitted over the air by radio waves and received by a television antenna attached to the television. FM radio programming, high-speed Internet, telephone services, and similar non-television services may also be provided through these cables, analog television was standard in the 20th century, but since the 2000s, cable systems have been upgraded to digital cable operation. A cable channel is a television network available via cable television, alternative terms include non-broadcast channel or programming service, the latter being mainly used in legal contexts. Examples of cable/satellite channels/cable networks available in many countries are HBO, MTV, Cartoon Network, E. Eurosport, the abbreviation CATV is often used for cable television. It originally stood for Community Access Television or Community Antenna Television, in areas where over-the-air TV reception was limited by distance from transmitters or mountainous terrain, large community antennas were constructed, and cable was run from them to individual homes. The origins of cable broadcasting for radio are even older as radio programming was distributed by cable in some European cities as far back as 1924, Cable television has gone through a series of steps of evolution in the United States and Canada. Particularly in Canada, communities with their own signals were fertile cable markets, as viewers wanted to receive American signals. Early systems carried only a maximum of seven channels, using 2,4,5 or 6,7,9,11 and 13, as the equipment was unable to confine the signal discreetly within the assigned channel bandwidth. The reason 4 and 5 along with 6 and 7 could be used together was because of the 4 MHz gap between 4 and 5 and the nearly 90 MHz gap between 6 and 7. Even though eight channels are listed, in systems that maximized 7 channels. As equipment improved, all channels could be utilized, except where a local VHF television station broadcast. Local broadcast channels were not usable for signals deemed to be priority, later, the cable operators began to carry FM radio stations, and encouraged subscribers to connect their FM stereo sets to cable. Before stereo and bilingual TV sound became common, Pay-TV channel sound was added to the FM stereo cable line-ups, about this time, operators expanded beyond the 12-channel dial to use the midband and superband VHF channels adjacent to the high band 7-13 of North American television frequencies. Some operators as in Cornwall, Ontario, used a dual distribution network with Channels 2-13 on each of the two cables, during the 1980s, United States regulations not unlike public, educational, and government access created the beginning of cable-originated live television programming. These stations evolved partially into todays over-the-air digital subchannels, where a main broadcast TV station e. g, many live local programs with local interests were subsequently created all over the United States in most major television markets in the early 1980s. This evolved into todays many cable-only broadcasts of diverse programming, including cable-only produced television movies and miniseries, Cable specialty channels, starting with channels oriented to show movies and large sporting or performance events, diversified further, and narrowcasting became common. By the late 1980s, cable-only signals outnumbered broadcast signals on cable systems, by the mid-1980s in Canada, cable operators were allowed by the regulator to enter into distribution contracts with cable networks on their own. By the 1990s, tiers became common, with customers able to subscribe to different tiers to obtain different selections of additional channels above the basic selection, by subscribing to additional tiers, customers could get specialty channels, movie channels, and foreign channels
17.
HBO Latin America Group
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HBO Latin America Group is a company which owns several cable networks in the region of Latin America. It is owned by Time Warner, Latin America Telemundo Internacional Universal Channel Studio Universal Syfy Sony Pictures Entertainment, Sony Entertainment Television AXN Fellow Time Warner division Warner Bros. HBO Family *e HBO HD Locomotion Sony Spin Turner Broadcasting System Time Warner Official Website Template, HBO Latin America Group
18.
Playboy TV
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Playboy TV is an American, adults-only premium cable and satellite television network that is owned by Playboy Enterprises. Its programming focuses on premium adult programming, including pictures, first-run television series. The channel is available internationally in such as Sweden, Brazil, Canada, Japan, Mexico, New Zealand, Greece, Iberia. The channel launched on November 1,1982 as The Playboy Channel and it was originally owned by Playboy Enterprises in partnership with Cablevision Systems Corporation, which eventually sold its interest in the channel back to Playboy in 1986. The original programming and style of the Playboy Channel was developed by the founder and Chief Creative Officer of Playboy Enterprises, Hugh Hefner, Playboy hired its own sales and marketing staff and launched the channel on several major multiple system operators. At the time of its launch, programming featured on the channel consisted of R-rated films and it was broadcast for only ten hours each day, from 8 p. m. to 6 a. m. ET, during its first eleven years of existence, the channel re-launched as Playboy TV and adopted its current name on November 1,1989. The network expanded its programming with the adoption of a 24-hour schedule in 1994, Playboy TV was originally developed as a video version of Playboy Magazine. Programming featured music reviews, celebrity interviews, men’s fashion and segments on cars and it was a video extension of the magazine - an established lifestyle brand. Slowly the programming on the channel evolved to feature more pretty girls and this then evolved to what would become more standard television programming with a focus primarily on a male demographic. In 2010, Playboy TV unveiled a new slate of TV For 2 programming, additional content included original documentary series produced by Joe and Harry Gantz, the Emmy-winning creators of HBO’s Taxicab Confessions. Playboy TV also airs original comedic programs such as The Stash, The Truth About Sex, Foursome, Walk of Shame and The Arcade. The channel features popular adult movie parodies, new releases and profiles of game-changing classic adult films in the popular series Groundbreakers hosted by legendary filmmaker John Waters. In December, Playboy TV presents Mr. Skin’s Year In Nudes, Playmate Anthology Playmate of the Year Playmate Playback Playmates
19.
LAPTV
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LAPTV is a Latin American pay television company founded by many cable providers of the region and many cinema producers/distributors but since 2013 is a wholly owned subsidiary of Fox Networks Group. It runs several film and television channels, such as Cinecanal, Fox+ and Film Zone. LAPTV was formed as a partnership between Metro-Goldwyn-Mayer, Paramount Pictures, and Fox in Latin America in 1993 with Universal Studios joining later, on May 22,2012, Fox International Channels acquired MGMs stake in LAP TV. In March 2013, Fox purchased Paramounts position in the company, thus becoming the owner of LAP TV. Operations of Cinecanal and Film Zone wont be affected, FOX1 FOX Action Fox Comedy Fox Movies Fox Family Fox Cinema Fox Classics Film Zone, Offers 3 independent films from the Sundance Channel and films previously shown on Moviecity/Fox+ and Cinecanal. Cinecanal, Mix of new releases and slightly older films, also shows films previously shown on Moviecity/Fox+, before 2010 it was part of the Premium package of the company. Moviecity, New releases only Cinecanal2, Mix of new releases and slightly older films Cinecanal Classic, Classic movies Official website Official Site
20.
MLB Extra Innings
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MLB Extra Innings is an Out-of-Market Sports Package distributed in North America by satellite provider DirecTV since 2010 and by most cable providers since 2001. The package allows its subscribers to see up to 80 out-of-market Major League Baseball games a week using local over the air stations, Dish Network offered the package from 2004–2006 but as of January 2013, Dish was still not offering MLB Extra Innings. Despite the status, the satellite provider began carrying the MLB Network on September 1,2011, on March 29,2015, Dish announced it will again offer MLB Extra Innings. As of the 2008 season, the feeds from both teams broadcasts are available for each game on DirecTV, even if a team is showing the game locally on a broadcast station. Even though the package relies on satellite uplink paths, DirecTV also carries feeds from local broadcast and even cable-only networks as well, feeds that are not included on the DirecTV version of Extra Innings include KCAL, KCOP-TV, KNTV, and WCIU unless that is your local area. The iN DEMAND version of Extra Innings added the dual feed system for select broadcasts after the 2008 MLB All-Star Game, previously, only one feed was available, usually the home teams. Free previews of MLB Extra Innings are shown during the first week of the season, at first, it was to be an exclusive deal worth $700 million. By March 9, negotiations had begun to try to settle the dispute, with a deadline of April 1, furthermore, these systems were asked to place the channel on an expanded digital tier. At least one system, Time Warner Cable, balked at the terms. The offer from the consortium to MLB would have matched the financing portion. Cable systems did guarantee to reach at least as many viewers of MLB Network as DirecTV will reach, MLB was not satisfied with the offer, and publicly claimed that the cable companies failed to meet more of the criteria for the deal than they had actually met. Hence, MLB was accused of claiming that cable would not meet the terms as DirecTV. As of the start of the season on April 2, only DirecTV had agreed to terms and was able to retain Extra Innings. It would not be available on any cable system until after the deadline was extended, on April 4, MLB and iN DEMAND finally reached an agreement similar to the one that MLB reached with DirecTV. Cable companies that carry iN DEMAND resumed carrying MLB Extra Innings, Dish never came to an agreement and did not carry the package until a new deal was reached with MLB on March 31,2015. Cablevision agreed to carry the MLB Network without getting the equity stake in it, charter Communications also reached an agreement with MLB. iN DEMAND places MLB Extra Innings on the same channels as its NHL Center Ice service. Some providers, like Comcast and Suddenlink Communications may not offer all 14 MLB game channels, because of hockey games shown on the same channels, some nights on Comcast and Suddenlink see no more than 2 or 3 games being shown. Some Comcast cable systems do carry all 14 game channels, while some systems have limited number of channels, DirecTV customers do not have this problem, as their 15 channels are dedicated solely to baseball
21.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
22.
Europe
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Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, yet the non-oceanic borders of Europe—a concept dating back to classical antiquity—are arbitrary. Europe covers about 10,180,000 square kilometres, or 2% of the Earths surface, politically, Europe is divided into about fifty sovereign states of which the Russian Federation is the largest and most populous, spanning 39% of the continent and comprising 15% of its population. Europe had a population of about 740 million as of 2015. Further from the sea, seasonal differences are more noticeable than close to the coast, Europe, in particular ancient Greece, was the birthplace of Western civilization. The fall of the Western Roman Empire, during the period, marked the end of ancient history. Renaissance humanism, exploration, art, and science led to the modern era, from the Age of Discovery onwards, Europe played a predominant role in global affairs. Between the 16th and 20th centuries, European powers controlled at times the Americas, most of Africa, Oceania. The Industrial Revolution, which began in Great Britain at the end of the 18th century, gave rise to economic, cultural, and social change in Western Europe. During the Cold War, Europe was divided along the Iron Curtain between NATO in the west and the Warsaw Pact in the east, until the revolutions of 1989 and fall of the Berlin Wall. In 1955, the Council of Europe was formed following a speech by Sir Winston Churchill and it includes all states except for Belarus, Kazakhstan and Vatican City. Further European integration by some states led to the formation of the European Union, the EU originated in Western Europe but has been expanding eastward since the fall of the Soviet Union in 1991. The European Anthem is Ode to Joy and states celebrate peace, in classical Greek mythology, Europa is the name of either a Phoenician princess or of a queen of Crete. The name contains the elements εὐρύς, wide, broad and ὤψ eye, broad has been an epithet of Earth herself in the reconstructed Proto-Indo-European religion and the poetry devoted to it. For the second part also the divine attributes of grey-eyed Athena or ox-eyed Hera. The same naming motive according to cartographic convention appears in Greek Ανατολή, Martin Litchfield West stated that phonologically, the match between Europas name and any form of the Semitic word is very poor. Next to these there is also a Proto-Indo-European root *h1regʷos, meaning darkness. Most major world languages use words derived from Eurṓpē or Europa to refer to the continent, in some Turkic languages the originally Persian name Frangistan is used casually in referring to much of Europe, besides official names such as Avrupa or Evropa
23.
Very high frequency
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Very high frequency is the ITU designation for the range of radio frequency electromagnetic waves from 30 MHz to 300 MHz, with corresponding wavelengths of ten to one meters. Frequencies immediately below VHF are denoted high frequency, and the higher frequencies are known as ultra high frequency. Air traffic control communications and air navigation systems work at distances of 100 kilometres or more to aircraft at cruising altitude, some older DVB-T receivers included channels E2 to E4 but newer ones only go down to channel E5. VHF propagation characteristics are suited for terrestrial communication, with a range generally somewhat farther than line-of-sight from the transmitter. VHF waves are restricted to the radio horizon less than 100 miles. VHF is less affected by noise and interference from electrical equipment than lower frequencies. Unlike high frequencies, the ionosphere does not usually reflect VHF waves, the distance to the radio horizon is slightly extended over the geometric line of sight to the horizon, as radio waves are weakly bent back toward the Earth by the atmosphere. These approximations are only valid for antennas at heights that are compared to the radius of the Earth. They may not necessarily be accurate in mountainous areas, since the landscape may not be transparent enough for radio waves, in engineered communications systems, more complex calculations are required to assess the probable coverage area of a proposed transmitter station. The accuracy of calculations for digital TV signals is being debated. Portable radios usually use whips or rubber ducky antennas, while base stations usually use larger fiberglass whips or collinear arrays of vertical dipoles, for directional antennas, the Yagi antenna is the most widely used as a high gain or beam antenna. For television reception, the Yagi is used, as well as the log periodic antenna due to its wider bandwidth, helical and turnstile antennas are used for satellite communication since they employ circular polarization. For even higher gain, multiple Yagis or helicals can be mounted together to make array antennas, vertical collinear arrays of dipoles can be used to make high gain omnidirectional antennas, in which more of the antennas power is radiated in horizontal directions. Television and FM broadcasting stations use arrays of specialized dipole antennas such as batwing antennas. Certain subparts of the VHF band have the same use around the world, some national uses are detailed below. 108–118 MHz, Air navigation beacons VOR and Instrument Landing System localiser, 118–137 MHz, Airband for air traffic control, AM,121.5 MHz is emergency frequency 144–146 MHz, Amateur radio. Other capital cities and regional areas used a combination of these, the initial commercial services in Hobart and Darwin were respectively allocated channels 6 and 8 rather than 7 or 9. By the early 1960s it became apparent that the 10 VHF channels were insufficient to support the growth of television services and this was rectified by the addition of three additional frequencies—channels 0, 5A and 11
24.
Ultra high frequency
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Ultra high frequency is the ITU designation for radio frequencies in the range between 300 MHz and 3 GHz, also known as the decimetre band as the wavelengths range from one meter to one decimetre. Radio waves with frequencies above the UHF band fall into the SHF or microwave frequency range, lower frequency signals fall into the VHF or lower bands. UHF radio waves propagate mainly by line of sight, they are blocked by hills, the IEEE defines the UHF radar band as frequencies between 300 MHz and 1 GHz. Two other IEEE radar bands overlap the ITU UHF band, the L band between 1 and 2 GHz and the S band between 2 and 4 GHz. Radio waves in the UHF band travel almost entirely by propagation and ground reflection, there is very little reflection from the ionosphere. They are blocked by hills and cannot travel far beyond the horizon, atmospheric moisture reduces, or attenuates, the strength of UHF signals over long distances, and the attenuation increases with frequency. UHF TV signals are generally more degraded by moisture than lower bands, occasionally when conditions are right, UHF radio waves can travel long distances by tropospheric ducting as the atmosphere warms and cools throughout the day. The length of an antenna is related to the length of the radio waves used, the UHF antenna is stubby and short, at UHF frequencies a quarter-wave monopole, the most common omnidirectional antenna is between 2.5 and 25 cm long for example. UHF is widely used in telephones, cell phones, walkie-talkies and other two-way radio systems from short range up to the visual horizon. Their transmissions do not travel far, allowing frequency reuse, public safety, business communications and personal radio services such as GMRS, PMR446, and UHF CB are often found on UHF frequencies as well as IEEE802.11 wireless LANs. The widely adapted GSM and UMTS cellular networks use UHF cellular frequencies, radio repeaters are used to retransmit UHF signals when a distance greater than the line of sight is required. Omnidirectional UHF antennas used on mobile devices are usually short whips, higher gain omnidirectional UHF antennas can be made of collinear arrays of dipoles and are used for mobile base stations and cellular base station antennas. The short wavelengths also allow high gain antennas to be conveniently small, high gain antennas for point-to-point communication links and UHF television reception are usually Yagi, log periodic, corner reflectors, or reflective array antennas. At the top end of the band slot antennas and parabolic dishes become practical, for television broadcasting specialized vertical radiators that are mostly modifications of the slot antenna or helical antenna are used, the slotted cylinder, zig-zag, and panel antennas. UHF television broadcasting fulfilled the demand for additional over-the-air television channels in urban areas, today, much of the bandwidth has been reallocated to land mobile, trunked radio and mobile telephone use. UHF channels are used for digital television. UHF spectrum is used worldwide for mobile radio systems for commercial, industrial, public safety. Many personal radio services use frequencies allocated in the UHF band, major telecommunications providers have deployed voice and data cellular networks in UHF/VHF range
25.
IPTV
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Unlike downloaded media, IPTV offers the ability to stream the source media continuously. As a result, a client media player can begin playing the data almost immediately and this is known as streaming media. Although IPTV uses the Internet protocol it is not limited to television media streamed from the Internet, IPTV in the telecommunications arena is notable for its ongoing standardisation process. Historically, many different definitions of IPTV have appeared, including elementary streams over IP networks, transport streams over IP networks and these services may include, for example, Live TV, Video On Demand and Interactive TV. These services are delivered across an access agnostic, packet switched network that employs the IP protocol to transport the audio, video, the term IPTV first appeared in 1995 with the founding of Precept Software by Judith Estrin and Bill Carrico. Precept developed an Internet video product named IP/TV, the software was written primarily by Steve Casner, Karl Auerbach, and Cha Chee Kuan. Precept was acquired by Cisco Systems in 1998, Internet radio company AudioNet started the first continuous live webcasts with content from WFAA-TV in January 1998 and KCTU-LP on January 10,1998. The operator added additional VoD service in October 2001 with Yes TV, kingston was one of the first companies in the world to introduce IPTV and IP VoD over ADSL as a commercial service. The service became the reference for various changes to UK Government regulations, in 2006, the KIT service was discontinued, subscribers having declined from a peak of 10,000 to 4,000. In 1999, NBTel was the first to commercially deploy Internet protocol television over DSL in Canada using the Alcatel 7350 DSLAM, the service was marketed under the brand VibeVision in New Brunswick, and later expanded into Nova Scotia in early 2000 after the formation of Aliant. IMagic TV was later sold to Alcatel, in 2002, Sasktel was the second in Canada to commercially deploy Internet Protocol video over DSL, using the Lucent Stinger DSL platform. In 2005, SureWest Communications was the first North American company to offer high-definition television channels over an IPTV service, in 2005, Bredbandsbolaget launched its IPTV service as the first service provider in Sweden. As of January 2009, they are not the biggest supplier any longer, TeliaSonera, in 2007, TPG became the first internet service provider in Australia to launch IPTV. Complementary to its ADSL2+ package this was, and still is, free of charge to customers on eligible plans and now offers over 45 local free to air channels, by 2010, iiNet and Telstra launched IPTV services in conjunction to internet plans but with extra fees. In 2008, PTCL launched IPTV under the name of PTCL Smart TV in Pakistan. S. Markets with an IPTV service called Prism and this was after successful test marketing in Florida. During the 2014 Winter Olympics Shortest path bridging was used to deliver 36 IPTV HD Olympic channels, in 2016, KCTV introduced the Set-top box called Manbang, claiming to provide video-on-demand services in North Korea via quasi-internet protocol television. According to KCTV, viewers can use the service not only in Pyongyang, stating that the demands for the equipment are particularly high in Sinuiju, with several hundred users in the region
26.
Satellite television
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A direct-broadcast satellite is a type of artificial satellite which usually broadcasts satellite television signals for home reception. The type of satellite television which uses direct-broadcast satellites is known as direct-broadcast satellite television or direct-to-home television and these services were to use the D-Mac and D2-Mac format and BSS frequencies with circular polarization from orbital positions allocated to each country. Before these DBS satellites, home satellite television in Europe was limited to a few channels, really intended for cable distribution, in 1977, the ITU adopted an international BSS Plan under which each country was allocated specific frequencies at specific orbital locations for domestic service. Over the years, this plan has been modified to, for example, accommodate new countries, increase coverage areas, at present, numerous countries have brought into use their BSS Plan allocations. By contrast, the term DTH can apply to similar services transmitted over a range of frequencies transmitted from satellites that are not part of any internationally planned band. The term DBS is often used interchangeably with DTH to cover both analog and digital video and audio services received by relatively small dishes, a DBS service usually refers to either a commercial service, or a group of free channels available from one orbital position targeting one country. In certain regions of the world, especially in North America, DBS is used to refer to providers of subscription satellite packages, the second commercial DBS service, Sky Television plc, was launched in 1989. Sky TV started as a four-channel free-to-air analogue service on the Astra 1A satellite, by 1991, Sky had changed to a conditional access pay model, and it launched a digital service, Sky Digital, in 1998, with analogue transmission ceasing in 2001. Since the DBS nomenclature is used in the UK or Ireland. News Corporation has a 32% stake in BSkyB, PrimeStar began transmitting an analog service to North America in 1991, and was joined by DirecTV, in 1994. At the time, DirecTVs introduction was the most successful consumer electronics debut in American history, although PrimeStar transitioned to a digital system in 1994, it was ultimately unable to compete with DirecTV, which required a smaller satellite dish and could deliver more programming. DirecTV purchased PrimeStar in 1999 and moved all of that subscribers to DirecTV equipment. In 2008, Liberty Media Corporation purchased News Corporations controlling interest in DirecTV, in 1996, EchoStars Dish Network went online in the United States and, as DirecTVs primary competitor, achieved similar success. AlphaStar also started but soon went under, astro was also started, using a direct broadcast satellite system. Dominion Video Satellite Inc. s Sky Angel launched on a platform in the United States in 1996, with its DBS service geared toward the faith. It grew from six to 36 television and radio channels of entertainment, Christian-inspirational programming. Dominion, under its corporate name Video Satellite Systems Inc. Sky Angel, although a separate and independent DBS service, used the satellites, transmission facilities
27.
Multichannel Multipoint Distribution Service
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The BRS band uses microwave frequencies from 2.5 GHz to 2.7 GHz. Reception of BRS-delivered television and data signals is done with a microwave antenna. Digital TV channels can then be decoded with a standard cable set-top box or directly for TVs with integrated digital tuners, Internet data can be received with a standard DOCSIS Cable Modem connected to the same antenna and transceiver. The MMDS band is separated into 336 MHz channels which may be licensed to cable companies offering service in different areas of a country. The concept was to allow entities to own several channels and multiplex several television, radio, just like with Digital Cable channels, each channel is capable of 30.34 Mbit/s with 64QAM modulation, and 42.88 Mbit/s with 256QAM modulation. Due to forward error correction and other overhead, actual throughput is around 27 Mbit/s for 64QAM and 38 Mbit/s for 256QAM. The newer BRS Band Plan makes changes to size and licensing in order to accommodate new WIMAX TDD fixed and mobile equipment. These changes may not be compatible with the frequencies and channel sizes required for operating traditional MMDS or DOCSIS based equipment, local Multipoint Distribution Service and BRS have adapted the DOCSIS from the cable modem world. The version of DOCSIS modified for wireless broadband is known as DOCSIS+, data-transport security is accomplished under BRS by encrypting traffic flows between the broadband wireless modem and the WMTS located in the base station of the providers network using Triple DES. LMDS and BRS wireless modems utilize the DOCSIS+ key-management protocol to obtain authorization and traffic encryption material from a WMTS, the key-management protocol uses X.509 digital certificates, RSA public key encryption, and Triple DES encryption to secure key exchanges between the wireless modem and the WMTS. MMDS provided significantly greater range than LMDS. MMDS may be obsoleted by the newer 802.16 WiMAX standard approved since 2004, MMDS was sometimes expanded to Multipoint Microwave Distribution System or Multi-channel Multi-point Distribution System. All three phrases refer to the same technology, in the United States, WATCH Communications, Eagle Vision, and several other companies offer MMDS-based wireless cable television, Internet access, and IP-based telephone services. CommSPEED is a vendor in the US market for BRS-based internet. AWI Networks operates a number of MMDS sites delivering high-speed Internet, VoIP telephone, in 2010, AWI began upgrading its infrastructure to DOCSIS3.0 hardware, along with new microwave transmission equipment, allowing higher modulation rates like 256QAM. This has enabled download speeds in excess of 100 Mbit/s, over distances up to 35 miles from the transmission site, in the early days of MMDS, it was known as Wireless Cable and was used in a variety of investment scams that still surface today. Frequent solicitations of Wireless Cable fraud schemes were often heard on radio shows like The Sonny Bloch Show in the mid-1990s. In the Canadian provinces of Manitoba and British Columbia, Craig Wireless operates a cable and internet service for rural. In Mexico, the 2.5 GHz band spectrum was reclaimed by the government in order to allow newer and better wireless data services
28.
Area codes in the Caribbean
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By the mid-1990s, with the proliferation of fax machines, mobile phones, computers, and pagers in the region, the 809 area code was almost exhausted. New area codes were added, and since 1999 no two share a code. 809 is now used only in the Dominican Republic, sint Maarten used the country code +599 of the Netherlands Antilles until joining the NANP on September 30,2011, with area code 721. The following was the 1994-1995 numbering plan for 809, starting in the 1980s, Puerto Rico, Bermuda and the Dominican Republic began to use prefixes from unused ranges throughout the 2xx to 9xx range. Historic ranges are shown in parentheses, the national number appeared in local telephone directories. Caribbean nations with a larger numbering resource requirement used seven-digit dialing, in chart above, digits in italics were just the initial digit of seven-digit number dialing. Source for above info, Incumbent provider Cable and Wireless Telephone-directory from Barbados of 1994-1995, not all of the Caribbean islands are in the North American Numbering Plan, the following have country codes. 809 scam List of NANP area codes North American Numbering Plan expansion List of country calling codes Category, Telephone numbers by country North American Numbering Plan Administration
29.
Mobile phone
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A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. The radio frequency link establishes a connection to the systems of a mobile phone operator. Most modern mobile telephone services use a network architecture, and, therefore. Mobile phones which offer these and more general computing capabilities are referred to as smartphones, the first handheld mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing c.4.4 lbs. In 1983, the DynaTAC 8000x was the first commercially available mobile phone. From 1983 to 2014, worldwide mobile phone subscriptions grew to seven billion, penetrating 100% of the global population. In first quarter of 2016, the top smartphone manufacturers were Samsung, Apple, a handheld mobile radio telephone service was envisioned in the early stages of radio engineering. In 1917, Finnish inventor Eric Tigerstedt filed a patent for a pocket-size folding telephone with a thin carbon microphone. Early predecessors of cellular phones included analog radio communications from ships, the race to create truly portable telephone devices began after World War II, with developments taking place in many countries. These 0G systems were not cellular, supported few simultaneous calls, the first handheld mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing c.4.4 lbs. The first commercial automated cellular network was launched in Japan by Nippon Telegraph and this was followed in 1981 by the simultaneous launch of the Nordic Mobile Telephone system in Denmark, Finland, Norway, and Sweden. Several other countries followed in the early to mid-1980s. These first-generation systems could support far more simultaneous calls but still used analog cellular technology, in 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone. In 1991, the digital cellular technology was launched in Finland by Radiolinja on the GSM standard. This sparked competition in the sector as the new operators challenged the incumbent 1G network operators, ten years later, in 2001, the third generation was launched in Japan by NTT DoCoMo on the WCDMA standard. This was followed by 3. 5G, 3G+ or turbo 3G enhancements based on the high-speed packet access family, allowing UMTS networks to have data transfer speeds. By 2009, it had become clear that, at point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications. Consequently, the industry began looking to data-optimized fourth-generation technologies, with the promise of speed improvements up to ten-fold over existing 3G technologies
30.
Microwave transmission
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Microwave transmission is the transmission of information or energy by electromagnetic waves whose wavelengths are measured in small numbers of centimetre, these are called microwaves. This part of the spectrum ranges across frequencies of roughly 1.0 gigahertz to 300 GHz. These correspond to wavelengths from 30 centimeters down to 0.1 cm, communication satellites which transferred data between ground stations by microwaves took over much long distance traffic in the 1960s. This allows nearby microwave equipment to use the same frequencies without interfering with each other, a disadvantage is that microwaves are limited to line of sight propagation, they cannot pass around hills or mountains as lower frequency radio waves can. Microwave radio transmission is used in point-to-point communication systems on the surface of the Earth, in satellite communications. Other parts of the radio band are used for radars, radio navigation systems, sensor systems. Radio waves in this band are usually strongly attenuated by the Earthly atmosphere and particles contained in it, also, in wide band of frequencies around 60 GHz, the radio waves are strongly attenuated by molecular oxygen in the atmosphere. Wireless transmission of power Proposed systems e. g, in microwave radio relay, microwaves are transmitted between the two locations with directional antennas, forming a fixed radio connection between the two points. The requirement of a line of sight limits the distance between stations to 30 or 40 miles. Beginning in the 1950s, networks of microwave links, such as the AT&T Long Lines system in the U. S. carried long distance telephone calls. The first system, dubbed TD-2 and built by AT&T, connected New York and these included long daisy-chained series of such links that traversed mountain ranges and spanned continents. Much of the traffic is now carried by cheaper optical fibers and communication satellites. Antennas must be highly directional, these antennas are installed in elevated locations such as radio towers in order to be able to transmit across long distances. Typical types of antenna used in radio relay link installations are parabolic antennas, dielectric lens, and horn-reflector antennas, highly directive antennas permit an economical use of the available frequency spectrum, despite long transmission distances. Because of the frequencies used, a line-of-sight path between the stations is required. Additionally, in order to avoid attenuation of the beam an area around the beam called the first Fresnel zone must be free from obstacles, obstacles in the signal field cause unwanted attenuation. In the planning process, it is essential that path profiles are produced, multipath fades are usually deep only in a small spot and a narrow frequency band, so space and/or frequency diversity schemes can be applied to mitigate these effects. Rare events of temperature, humidity and pressure profile versus height, may produce large deviations and distortion of the propagation and affect transmission quality
31.
South America
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South America is a continent located in the western hemisphere, mostly in the southern hemisphere, with a relatively small portion in the northern hemisphere. It may also be considered a subcontinent of the Americas, which is the used in nations that speak Romance languages. The reference to South America instead of other regions has increased in the last decades due to changing geopolitical dynamics. It is bordered on the west by the Pacific Ocean and on the north and east by the Atlantic Ocean, North America and it includes twelve sovereign states, a part of France, and a non-sovereign area. In addition to this, the ABC islands of the Kingdom of the Netherlands, Trinidad and Tobago, South America has an area of 17,840,000 square kilometers. Its population as of 2005 has been estimated at more than 371,090,000, South America ranks fourth in area and fifth in population. Brazil is by far the most populous South American country, with more than half of the population, followed by Colombia, Argentina, Venezuela. In recent decades Brazil has also concentrated half of the regions GDP and has become a first regional power, most of the population lives near the continents western or eastern coasts while the interior and the far south are sparsely populated. Most of the continent lies in the tropics, the continents cultural and ethnic outlook has its origin with the interaction of indigenous peoples with European conquerors and immigrants and, more locally, with African slaves. Given a long history of colonialism, the majority of South Americans speak Portuguese or Spanish. South America occupies the portion of the Americas. The continent is delimited on the northwest by the Darién watershed along the Colombia–Panama border. Almost all of mainland South America sits on the South American Plate, South Americas major mineral resources are gold, silver, copper, iron ore, tin, and petroleum. These resources found in South America have brought high income to its countries especially in times of war or of rapid growth by industrialized countries elsewhere. However, the concentration in producing one major export commodity often has hindered the development of diversified economies and this is leading to efforts to diversify production to drive away from staying as economies dedicated to one major export. South America is one of the most biodiverse continents on earth, South America is home to many interesting and unique species of animals including the llama, anaconda, piranha, jaguar, vicuña, and tapir. The Amazon rainforests possess high biodiversity, containing a proportion of the Earths species. Brazil is the largest country in South America, encompassing around half of the land area
32.
Central America
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Central America is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. Central America is bordered by Mexico to the north, Colombia to the southeast, the Caribbean Sea to the east, Central America consists of seven countries, Belize, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama. The combined population of Central America is between 41,739,000 and 42,688,190, Central America is a part of the Mesoamerican biodiversity hotspot, which extends from northern Guatemala through to central Panama. Due to the presence of several active faults and the Central America Volcanic Arc. Volcanic eruptions and earthquakes occur frequently, these disasters have resulted in the loss of many lives. In the Pre-Columbian era, Central America was inhabited by the peoples of Mesoamerica to the north and west. Soon after Christopher Columbuss voyages to the Americas, the Spanish began to colonize the Americas, the seven states finally became independent autonomous states, beginning with Nicaragua, Honduras, Costa Rica, and Guatemala, followed by El Salvador, then Panama, and finally Belize. Middle America is usually thought to comprise Mexico to the north of the 7 states of Central America as well as Colombia, usually the whole of the Caribbean to the north-east and sometimes the Guyanas are also included. According to one source, the term Central America was used as a synonym for Middle America as recently as 1962, in Brazil, Central America comprises all countries between Mexico and Colombia, including those in the Caribbean. Mexico, in whole or in part, is included by British people. For the people living in the 5 countries formerly part of the Federal Republic of Central America there is a distinction between the Spanish language terms América Central and Centroamérica, in the Pre-Columbian era, the northern areas of Central America were inhabited by the indigenous peoples of Mesoamerica. Most notable among these were the Mayans, who had built numerous cities throughout the region, and the Aztecs, following Christopher Columbuss voyages to the Americas, the Spanish sent many expeditions to the region, and they began their conquest of Maya territory in 1523. Soon after the conquest of the Aztec Empire, Spanish conquistador Pedro de Alvarado commenced the conquest of northern Central America for the Spanish Empire. Beginning with his arrival in Soconusco in 1523, Alvarados forces systematically conquered and subjugated most of the major Maya kingdoms, including the Kiche, Tzutujil, Pipil, and the Kaqchikel. By 1528, the conquest of Guatemala was nearly complete, with only the Petén Basin remaining outside the Spanish sphere of influence, the last independent Maya kingdoms – the Kowoj and the Itza people – were finally defeated in 1697, as part of the Spanish conquest of Petén. In 1538, Spain established the Real Audiencia of Panama, which had jurisdiction over all land from the Strait of Magellan to the Gulf of Fonseca. This entity was dissolved in 1543, and most of the territory within Central America then fell under the jurisdiction of the Audiencia Real de Guatemala. This area included the current territories of Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and the Mexican state of Chiapas, the president of the Audiencia, which had its seat in Antigua Guatemala, was the governor of the entire area
33.
Caribbean
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The Caribbean is a region that consists of the Caribbean Sea, its islands and the surrounding coasts. The region is southeast of the Gulf of Mexico and the North American mainland, east of Central America, situated largely on the Caribbean Plate, the region comprises more than 700 islands, islets, reefs and cays. These islands generally form island arcs that delineate the eastern and northern edges of the Caribbean Sea, in a wider sense, the mainland countries of Belize, Guyana, Suriname and French Guiana are often included due to their political and cultural ties with the region. Geopolitically, the Caribbean islands are usually regarded as a subregion of North America and are organized into 30 territories including sovereign states, overseas departments, and dependencies. From December 15,1954, to October 10,2010, there was a known as the Netherlands Antilles composed of five states. The West Indies cricket team continues to represent many of those nations, the region takes its name from that of the Caribs, an ethnic group present in the Lesser Antilles and parts of adjacent South America at the time of the Spanish conquest. The two most prevalent pronunciations of Caribbean are KARR-ə-BEE-ən, with the accent on the third syllable. The former pronunciation is the older of the two, although the variant has been established for over 75 years. It has been suggested that speakers of British English prefer KARR-ə-BEE-ən while North American speakers more typically use kə-RIB-ee-ən, usage is split within Caribbean English itself. The word Caribbean has multiple uses and its principal ones are geographical and political. The Caribbean can also be expanded to include territories with strong cultural and historical connections to slavery, European colonisation, the United Nations geoscheme for the Americas accords the Caribbean as a distinct region within the Americas. Physiographically, the Caribbean region is mainly a chain of islands surrounding the Caribbean Sea, to the north, the region is bordered by the Gulf of Mexico, the Straits of Florida and the Northern Atlantic Ocean, which lies to the east and northeast. To the south lies the coastline of the continent of South America, politically, the Caribbean may be centred on socio-economic groupings found in the region. For example, the known as the Caribbean Community contains the Co-operative Republic of Guyana. Bermuda and the Turks and Caicos Islands, which are in the Atlantic Ocean, are members of the Caribbean Community. The Commonwealth of the Bahamas is also in the Atlantic and is a member of the Caribbean Community. According to the ACS, the population of its member states is 227 million people. The geography and climate in the Caribbean region varies, Some islands in the region have relatively flat terrain of non-volcanic origin and these islands include Aruba, Barbados, Bonaire, the Cayman Islands, Saint Croix, the Bahamas, and Antigua
34.
Communications satellite
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Communications satellites are used for television, telephone, radio, internet, and military applications. There are over 2,000 communications satellites in Earth’s orbit, Wireless communication uses electromagnetic waves to carry signals. These waves require line-of-sight, and are thus obstructed by the curvature of the Earth, the purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated points. Communications satellites use a range of radio and microwave frequencies. To avoid signal interference, international organizations have regulations for which frequency ranges or bands certain organizations are allowed to use and this allocation of bands minimizes the risk of signal interference. The concept of the communications satellite was first proposed by Arthur C. Clarke, building on work by Konstantin Tsiolkovsky and on the 1929 work by Herman Potočnik Das Problem der Befahrung des Weltraums — der Raketen-motor, in October 1945 Clarke published an article titled Extraterrestrial Relays in the British magazine Wireless World. The article described the fundamentals behind the deployment of artificial satellites in geostationary orbits for the purpose of relaying radio signals, thus, Arthur C. Clarke is often quoted as being the inventor of the communications satellite and the term Clarke Belt employed as a description of the orbit. Decades later a project named Communication Moon Relay was a project carried out by the United States Navy. Its objective was to develop a secure and reliable method of communication by using the Moon as a passive reflector. The first artificial Earth satellite was Sputnik 1, put into orbit by the Soviet Union on October 4,1957, it was equipped with an on-board radio-transmitter that worked on two frequencies,20.005 and 40.002 MHz. Sputnik 1 was launched as a step in the exploration of space, while incredibly important it was not placed in orbit for the purpose of sending data from one point on earth to another. And it was the first artificial satellite in the leading to todays satellite communications. The first artificial satellite used solely to further advances in communications was a balloon named Echo 1. Echo 1 was the worlds first artificial communications satellite capable of relaying signals to other points on Earth and it soared 1,600 kilometres above the planet after its Aug.12,1960 launch, yet relied on humanitys oldest flight technology — ballooning. Launched by NASA, Echo 1 was a 30-metre aluminized PET film balloon served as a passive reflector for radio communications. The worlds first inflatable satellite — or satelloon, as they were informally known — helped lay the foundation of todays satellite communications, the idea behind a communications satellite is simple, Send data up into space and beam it back down to another spot on the globe. Echo 1 accomplished this by serving as an enormous mirror,10 stories tall
35.
Intelsat
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Intelsat, S. A. is a communications satellite services provider. As of March 2017, Intelsat is to merge with Softbank backed OneWeb, the agreement is to merge in a share-for-share deal. SoftBank will buy voting and non-voting shares in the company for $1.7 billion in cash. Shares that Softbank-OneWeb will buy in the company will be bought for $5 per share. As of March 2011, Intelsat operates a fleet of 52 communications satellites and they claim to serve around 1,500 customers and employ a staff of approximately 1,100 people. The intergovernmental organization began on 20 August 1964, with 11 participating countries, on 6 April 1965, Intelsat’s first satellite, the Intelsat I, was placed in geostationary orbit above the Atlantic Ocean by a Delta D rocket. In 1973, the name was changed and there were 80 signatories, Intelsat provides service to over 600 Earth stations in more than 149 countries, territories and dependencies. By 2001, INTELSAT had over 100 members and it was also this year that INTELSAT privatized and changed its name to Intelsat. Since its inception, Intelsat has used versions of its dedicated Intelsat satellites. Intelsat completes each block of spacecraft independently, leading to a variety of contractors over the years, Intelsat’s largest spacecraft supplier is Space Systems/Loral, having built 31 spacecraft, or nearly half of the fleet. The network in its early years was not as robust as it is now. Fortunately, during the Apollo 11 moonwalk, the moon was over the Pacific Ocean, and so other antennas were used, as well as INTELSAT III, to avert the US governments interference with Intelsat, Intelsats senior management unsuccessfully considered relocating the IGO to another country. On 18 July 2001, Intelsat became a company,37 years after formation. Prior to Intelsats privatization in 2001, ownership and investment in INTELSAT was distributed among INTELSAT members according to their use of services, investment shares determined each member’s percentage of the total contribution needed to finance capital expenditures. Satellite services were available to any organization, and all paid the same rates. Today, the number of Intelsat satellites, as well as ocean-spanning fibre-optic lines, modern satellites are more robust, lasting longer with much larger capacity. Intelsat Americas-7 experienced a power failure on 29 November 2004. The satellite returned to service with reduced capacity, Intelsat was sold for U. S. $3. 1bn in January 2005 to four private equity firms, Madison Dearborn Partners, Apax Partners, Permira and Apollo Global Management
36.
Atlantic Ocean
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The Atlantic Ocean is the second largest of the worlds oceans with a total area of about 106,460,000 square kilometres. It covers approximately 20 percent of the Earths surface and about 29 percent of its surface area. It separates the Old World from the New World, the Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Eurasia and Africa to the east, and the Americas to the west. The Equatorial Counter Current subdivides it into the North Atlantic Ocean, in contrast, the term Atlantic originally referred specifically to the Atlas Mountains in Morocco and the sea off the Strait of Gibraltar and the North African coast. The Greek word thalassa has been reused by scientists for the huge Panthalassa ocean that surrounded the supercontinent Pangaea hundreds of years ago. The term Aethiopian Ocean, derived from Ancient Ethiopia, was applied to the Southern Atlantic as late as the mid-19th century, many Irish or British people refer to the United States and Canada as across the pond, and vice versa. The Black Atlantic refers to the role of ocean in shaping black peoples history. Irish migration to the US is meant when the term The Green Atlantic is used, the term Red Atlantic has been used in reference to the Marxian concept of an Atlantic working class, as well as to the Atlantic experience of indigenous Americans. Correspondingly, the extent and number of oceans and seas varies, the Atlantic Ocean is bounded on the west by North and South America. It connects to the Arctic Ocean through the Denmark Strait, Greenland Sea, Norwegian Sea, to the east, the boundaries of the ocean proper are Europe, the Strait of Gibraltar and Africa. In the southeast, the Atlantic merges into the Indian Ocean, the 20° East meridian, running south from Cape Agulhas to Antarctica defines its border. In the 1953 definition it extends south to Antarctica, while in later maps it is bounded at the 60° parallel by the Southern Ocean, the Atlantic has irregular coasts indented by numerous bays, gulfs, and seas. Including these marginal seas the coast line of the Atlantic measures 111,866 km compared to 135,663 km for the Pacific. Including its marginal seas, the Atlantic covers an area of 106,460,000 km2 or 23. 5% of the ocean and has a volume of 310,410,900 km3 or 23. 3%. Excluding its marginal seas, the Atlantic covers 81,760,000 km2 and has a volume of 305,811,900 km3, the North Atlantic covers 41,490,000 km2 and the South Atlantic 40,270,000 km2. The average depth is 3,646 m and the maximum depth, the bathymetry of the Atlantic is dominated by a submarine mountain range called the Mid-Atlantic Ridge. It runs from 87°N or 300 km south of the North Pole to the subantarctic Bouvet Island at 42°S, the MAR divides the Atlantic longitudinally into two halves, in each of which a series of basins are delimited by secondary, transverse ridges. The MAR reaches above 2000 m along most of its length, the MAR is a barrier for bottom water, but at these two transform faults deep water currents can pass from one side to the other
37.
IPv4
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Internet Protocol version 4 is the fourth version of the Internet Protocol. It is one of the protocols of standards-based internetworking methods in the Internet. It still routes most Internet traffic today, despite the deployment of a successor protocol. IPv4 is described in IETF publication RFC791, replacing an earlier definition, IPv4 is a connectionless protocol for use on packet-switched networks. It operates on a best effort delivery model, in that it does not guarantee delivery and these aspects, including data integrity, are addressed by an upper layer transport protocol, such as the Transmission Control Protocol. IPv4 uses 32-bit addresses which limits the space to 4294967296 addresses. IPv4 reserves special address blocks for private networks and multicast addresses, IPv4 addresses may be represented in any notation expressing a 32-bit integer value. They are most often written in the notation, which consists of four octets of the address expressed individually in decimal numbers. For example, the quad-dotted IP address 192.0.2.235 represents the 32-bit decimal number 3221226219, which in hexadecimal format is 0xC00002EB. This may also be expressed in dotted hex format as 0xC0. 0x00. 0x02. 0xEB, or with octal byte values as 0300.0000.0002.0353. In the original design of IPv4, an IP address was divided into two parts, the identifier was the most significant octet of the address, and the host identifier was the rest of the address. The latter was called the rest field. This structure permitted a maximum of 256 network identifiers, which was found to be inadequate. To overcome this limit, the most-significant address octet was redefined in 1981 to create network classes, the revised system defined five classes. Classes A, B, and C had different bit lengths for network identification, the rest of the address was used as previously to identify a host within a network, which meant that each network class had a different capacity for addressing hosts. Class D was defined for multicast addressing and Class E was reserved for future applications, starting around 1985, methods were devised to subdivide IP networks. One method that has proved flexible is the use of the subnet mask. CIDR was designed to permit repartitioning of any address space so that smaller or larger blocks of addresses could be allocated to users, the hierarchical structure created by CIDR is managed by the Internet Assigned Numbers Authority and the regional Internet registries
This article incorporates public domain material from the CIA World Factbook website https://www.cia.gov/library/publications/the-world-factbook/index.html.
This article incorporates 
