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Total Access Communication System
Total Access Communication System (TACS) and ETACS are variants of Advanced Mobile Phone System (AMPS) which were announced as the choice for the first two UK national cellular systems in February 1983, less than a year after the UK government announced the T&Cs for the two competing mobile phone networks in June 1982. This 1G technology is now obsolete. History Vodafone (known then as Racal-Vodafone) opted for a £30 million turnkey contract from Ericsson (ERA) to design, build and set up its initial network of 100 base station sites. Cellnet (then known Telecom Securicor Cellular Radio Ltd) used development labs in the facilities at General Electric (later made part of Motorola) based at Lynchburg, Virginia, United States. The reason Cellnet used the General Electric labs was because the AMPS system was already in development there, and the company had set up a production facility in readiness for AMPS production in 1985 which the Cellnet TACS was to share. In March 1984 de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorola 4500X
Motorola, Inc. () was an American multinational telecommunications company based in Schaumburg, Illinois, United States. After having lost $4.3 billion from 2007 to 2009, the company split into two independent public companies, Motorola Mobility and Motorola Solutions on January 4, 2011. Motorola Solutions is the legal successor to Motorola, Inc., as the reorganization was structured with Motorola Mobility being spun off. Motorola Mobility was acquired by Lenovo in 2014. Motorola designed and sold wireless network equipment such as cellular transmission base stations and signal amplifiers. Motorola's home and broadcast network products included set-top boxes, digital video recorders, and network equipment used to enable video broadcasting, computer telephony, and high-definition television. Its business and government customers consisted mainly of wireless voice and broadband systems (used to build private networks), and, public safety communications systems like Astro an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hong Kong
Hong Kong ( (US) or (UK); , ), officially the Hong Kong Special Administrative Region of the People's Republic of China (abbr. Hong Kong SAR or HKSAR), is a city and special administrative region of China on the eastern Pearl River Delta in South China. With 7.5 million residents of various nationalities in a territory, Hong Kong is one of the most densely populated places in the world. Hong Kong is also a major global financial centre and one of the most developed cities in the world. Hong Kong was established as a colony of the British Empire after the Qing Empire ceded Hong Kong Island from Xin'an County at the end of the First Opium War in 1841 then again in 1842.. The colony expanded to the Kowloon Peninsula in 1860 after the Second Opium War and was further extended when Britain obtained a 99-year lease of the New Territories in 1898... British Hong Kong was occupied by Imperial Japan from 1941 to 1945 during World War II; British administration resumed afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobilkom
A1 Telekom Austria (A1, ''A eins'') is the leading fixed and mobile network operator in Austria, with 5.4 million mobile and 2.3 million fixed-line customers. A1 Telekom Austria traces its origins to Austria's first GSM mobile phone network which began testing in 1992 and commercial operations in 1994, under the name Mobilkom Austria, then part of the Austrian state-owned PTT agency ''Post- und Telegraphenverwaltung'' ( de; PTV) until it was split off into its own company in 1996. After Mobilkom's merger with A1 Telekom Austria Group in July 2010 it operates under the new name of A1 Telekom Austria. A1 Telekom Austria is a 100% subsidiary of A1 Telekom Austria Group. A1 Telekom Austria offers fixed–mobile convergence. The product portfolio includes Fixed line and mobile telephony, internet, IT services, IPTV, wholesale services as well as mobile payment services. It offers products under the brands ''A1'' (complete services offer), ''Bob'' and ''Yesss!'' ( No frills-mobile te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etisalat (Sri Lanka)
Etisalat (Sinhalese: එටිසලාට් ''Etisalat''; Tamil: எடிசலாட்) (formerly known as Celltel and later Tigo), was a mobile telecommunications network in Sri Lanka. It was owned by the UAE based telecommunications operator Etisalat until December 2018. Etisalat had over 4.2 million customers at the end of February 2012. The company announced the commercial launch of Dual Carrier HSPA+ services on 15 August 2012, becoming the first operator in South Asia to do so. In April 2018 CK Hutchison Group and Etisalat Group have entered into a definitive agreement to merge their mobile telecommunications businesses in Sri Lanka. Upon completion of the transaction, CKHH Group will have the majority and controlling stake in the combined entity. CK Hutchison completed the acquisition of Etisalat Lanka on 30 November 2018. History Celltel and Tigo Celltel was founded on 18 June 1989 on a Motorola TACS system, becoming the first cellular network in Sri Lanka and 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Companhia De Telecomunicações De Macau
Companhia de Telecomunicações de Macau S.A.R.L. () known as CTM is a telecommunications company in Macau, which obtained a monopoly franchise license from the government except for mobile telephone services. History Prior to 1981, telecommunications in Macau fell mainly under the purview of Macau Post and Telecommunications. Residents in Macau had to wait many months simply to have a telephone connected. To make a telephone call to Hong Kong was a lengthy procedure which had to be placed through an operator. On 29 September 1981, an agreement was reached between the then Portuguese Macau government and the British telecommunications company Cable & Wireless plc to set up the new company Companhia de Telecomunicações de Macau S.A.R.L.. Shareholders included Marconi Comunicações Internacionais (the Portuguese operations of the UK-based Marconi Company, acquired by Portugal Telecom (now Altice Portugal) in 2002), CITIC Pacific (later transferred to subsidiary CITIC Telecom I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
China Mobile
China Mobile is the trade name of both China Mobile Limited () and its ultimate controlling shareholder, China Mobile Communications Group Co., Ltd. (, formerly known as China Mobile Communications Corporation, "CMCC"), a Chinese state-ownedStrait deals ''The Economist'', 7 May 2009 company. China Mobile Limited provides mobile voice and multimedia services through its nationwide mobile telecommunications network across mainland China and Hong Kong. China Mobile is the largest wireless carrier in China, with 945.50 million subscribers as of June 2021. China Mobile Limited is listed on the Hong Kong Stock Exchange.Overview China Mobile Limited Official Site It is the world's largest mobile network operator [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hutchison Telecom
Hutchison Asia Telecom Group or HAT, is a division of Hong Kong-based multinational conglomerate CK Hutchison Holdings. The division provides telecommunications services to several Asian countries. The division was formerly incorporated as Hutchison Telecommunications International Limited, known as Hutchison Telecom or HTIL in short. It an offshore company in the Cayman Islands and a listed company in the Stock Exchange of Hong Kong. It operates GSM, 3G and 4G mobile telecommunications services in Indonesia, Sri Lanka and Vietnam under brands 3, Hutch and Vietnamobile. Hutchison Telecommunications International was formerly a listed company with a primary listing on the Stock Exchange of Hong Kong (former stock code: 2332) and American depositary shares quoted on the New York Stock Exchange. In May 2010, Hutchison Telecom became a fully owned subsidiary of the Hong Kong-based Hutchison Whampoa Group and its shares were delisted. In 2009, Hutchison Telecom also spin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CSL Mobile
CSL Mobile Limited () is a Hong Kong telecommunications company, which operates mobile network brands of "csl", "1O1O" and "Club SIM". CSL is a subsidiary of Hong Kong Telecom (HKT) and was Hong Kong's first mobile communications operator established in 1983, and also the first network to launch the world’s first dual band 4G LTE network with DC-HSPA+. The brand CSL was under different legal person in its operating history, namely Communication Services Limited, which known as Hong Kong Telecom CSL Limited from 1990 to 1999, and then Cable & Wireless HKT CSL Limited from 1999 to 2001, and then Hong Kong CSL Limited from 2001 (it became a subsidiary of CSL Limited after the formation of CSL New World Mobility), CSL Limited (formerly known as New World PCS) and CSL Mobile Limited; The current legal person of the brand, CSL Mobile Limited, was formally known as PCCW Mobile HK Limited. It was the result of the merger of the brands CSL and PCCW Mobile. History In the 1990s, CS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vodafone UK
Vodafone UK is a British telecommunications services provider, and a part of Vodafone Group Plc, the world's second-largest mobile phone company. Vodafone is the third-largest mobile network operator in the United Kingdom, with 16.9 million subscribers as of November 2021, after EE and O2, followed by Three. Vodafone has been the longest running network in the country since its first cellular network call was made in January 1985. The company's current slogan since 2020 is “Together we can”, replacing the previous slogan "The future is exciting. Ready?". The current branding and logo was created in 2017. History Mobile network In 1981, Racal Electronics Group won its bid for the private sector UK Cellular licence, and created Racal Telecomms Division. The same year, Racal formed a joint venture with Millicom named 'Racal Vodafone'. The Vodafone name was first unveiled on 22 March 1984. Vodafone made the first ever cellular telephone call in the United Kingdom on 1 J ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency
Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from '' angular frequency''. Frequency is measured in hertz (Hz) which is equal to one event per second. The period is the interval of time between events, so the period is the reciprocal of the frequency. For example, if a heart beats at a frequency of 120 times a minute (2 hertz), the period, —the interval at which the beats repeat—is half a second (60 seconds divided by 120 beats). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals ( sound), radio waves, and light. Definitions and units For cyclical phenomena such as oscillations, waves, or for examples of simple harmonic motion, the term ''frequency'' is defined as the number of cycles or vibrations per unit of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3 (telecommunications)
3 or Three is a global brand name owned by Hutchison 3G Enterprises S.A.R.L., under which several UMTS-based mobile phone networks and broadband internet providers operate in Hong Kong, Macau, Austria, Denmark, Indonesia, Ireland, Sweden, and the United Kingdom. The brand was founded in 2002 in Hong Kong. , registered ''Three'' customers worldwide numbered over 110 million. All 3-branded network companies are wholly owned subsidiaries of CK Hutchison Holdings but the ownership structure varies. CK Hutchison Holdings (formerly Hutchison Whampoa) owns direct majority interests of six networks through ''3 Group Europe'', including Austria, Denmark, Italy (Wind Tre), Ireland, Sweden and the United Kingdom. Hutchison Telecommunications Hong Kong Holdings operates the networks in Hong Kong and Macau, while Indosat Ooredoo Hutchison operates the network in Indonesia. All 3-branded networks provide 4G ( LTE) and 3G (WCDMA) services; some also run 2G networks and 5G services. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
O2 (Ireland)
Telefónica Ireland was a broadband and telecommunications provider in Ireland that traded under the O2 brand (typeset as O2). O2 Ireland was previously called Esat Digifone when it was owned by Esat Telecommunications (and Telenor) from 1997 to 2006. O2 Ireland became a subsidiary of Telefónica in 2006, after its parent company O2 in the United Kingdom was purchased. In June 2013, Hutchison Whampoa announced it would acquire the Irish arm of O2 for €780m. O2 was merged into Hutchison Whampoa's subsidiary Three Ireland in March 2015. History 1997–2000: Origin In 1995 the government, with Michael Lowry as Minister for Transport, Energy and Communications, authorised a second mobile phone network, to compete with Eircell owned by the semi-state Telecom Éireann. The licence was awarded to Esat Digifone, a joint venture between Denis O'Brien's company Esat Telecommunications and Norway's Telenor, which began operations in 1997. The Moriarty Tribunal found in 2008 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
