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IDEN
Integrated Digital Enhanced Network (iDEN) is a mobile telecommunications technology, developed by Motorola, which provides its users the benefits of a trunked radio and a cellular telephone. It was called the first mobile social network by many technology industry analysts. iDEN places more users in a given spectral space, compared to analog cellular and two-way radio systems, by using speech compression and time-division multiple access (TDMA). History The iDEN project originally began as MIRS (Motorola Integrated Radio System) in early 1991. The project was a software lab experiment focused on the utilization of discontiguous spectrum for GSM wireless. GSM systems typically require 24 contiguous voice channels, but the original MIRS software platform dynamically selected fragmented channels in the radio frequency (RF) spectrum in such a way that a GSM telecom switch could commence a phone call the same as it would in the contiguous channel scenario. Operating frequenc ...
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Iden
Integrated Digital Enhanced Network (iDEN) is a mobile telecommunications technology, developed by Motorola, which provides its users the benefits of a trunked radio and a cellular telephone. It was called the first mobile social network by many technology industry analysts. iDEN places more users in a given spectral space, compared to analog cellular and two-way radio systems, by using speech compression and time-division multiple access (TDMA). History The iDEN project originally began as MIRS (Motorola Integrated Radio System) in early 1991. The project was a software lab experiment focused on the utilization of discontiguous spectrum for GSM wireless. GSM systems typically require 24 contiguous voice channels, but the original MIRS software platform dynamically selected fragmented channels in the radio frequency (RF) spectrum in such a way that a GSM telecom switch could commence a phone call the same as it would in the contiguous channel scenario. Operating frequenc ...
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Sprint Nextel
Sprint Corporation was an American telecommunications company. Before it Merger of Sprint Corporation and T-Mobile US, merged with T-Mobile US on April 1, 2020, it was the fourth-largest mobile network operator in the United States, serving 54.3 million customers as of June 30, 2019. The company also offered wireless voice, messaging, and broadband services through its various subsidiaries under the Boost Mobile (United States), Boost Mobile and Open Mobile brands and wholesale access to its wireless networks to mobile virtual network operators. In July 2013, a majority of the company was purchased by the Japanese telecommunications company SoftBank Group. Sprint used CDMA2000, CDMA, Evolution-Data Optimized, EvDO and LTE (telecommunication), 4G LTE networks, and formerly operated iDEN, WiMAX, and 5G NR networks. Sprint was incorporated in Kansas. Sprint traced its origins to the Brown Telephone Company, which was founded in 1899 to bring telephone service to the rural area arou ...
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Motorola I870
The Motorola i870 is a clam-style cellular telephone designed for use with iDEN Networks. It was released for SouthernLINC networks in mid-October 2005, and for Nextel on October 31, 2005 as a replacement for the i860. A variation of this phone, the i875, was released for Boost Mobile as a replacement for the i860 Tattoo. Background Like the Motorola i850, i760, and even the i920/i930, the i870 sports WiDEN compliance with band support for both iDEN 800 and 900. The iDEN 900 band is also supported, helping relieve 800MHz spectrum pressures during Sprint's 800MHz rebanding effort, moving iDEN up to 862-869MHz while public safety radios utilize spectrum from 851-860MHz. Unlike the i930, the i870 does not operate under Windows Mobile 2003. While this is the case, it utilizes Bluetooth support with OBEX and hands-free earpiece compliance first found on the i605 (the i605 was not well-received due to its monolith form-factor). The i870 sports the same display properties as with th ...
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NII Holdings
NII Holdings, Inc. (formerly Nextel International) was an American holding company that, through its subsidiary Nextel Telecomunicações Ltda., provided mobile communications services under the Nextel brand in Brazil. NII operated 3G UMTS/HSDPA and 4G LTE networks in Brazil, and also operated an iDEN network there until its shutdown in 2018. On , NII Holdings completed the sale of its Brazilian operation, its last remaining subsidiary, to América Móvil. On the company filed a Certificate of Dissolution with the State of Delaware. In 2012, for the third consecutive year, NII Holdings ranked in the Fortune 500 and Barron's 500 lists. NII also has been named one of the best places to work among multinationals in Latin America by the Great Place to Work Institute. NII went through bankruptcy in 2014 and 2015. History NII originally launched as the international business unit of Nextel Communications as McCaw International in 1995. Later Nextel changes its name to Nextel inte ...
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Mike (cellular Network)
Clearnet (branded in advertising as "Clearne+") was a division of Telus Mobility launched in April 2011 to sell landline and mobile phone bundles in Western Canada. It was a revival of the Clearnet Communications brand name, which originally belonged to an independent cellular provider that was merged into Telus Mobility in 2000. Telus relaunched Clearnet as a discount provider with a "limited market trial" in Kelowna, British Columbia and Red Deer, Alberta. The company closed to new business in June 2012. Clearnet Communications Clearnet Communications was a Canadian cellular telephone service provider from 1984 to 2000, when it was acquired by Telus Mobility. Clearnet operated a CDMA-based PCS network and an iDEN-based cellular network called Mike. Following the merger, Clearnet's PCS service was incorporated into the existing Telus Mobility network, while the Mike system was kept as a separate service under its original name. All Clearnet's distinctive marketing and brandin ...
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SouthernLINC Wireless
Southern Communications Services, Inc (d/b/a as Southern Linc, and formerly as SouthernLINC Wireless) is a regional LTE carrier providing coverage in areas of the southeast United States including Mississippi, Alabama, Georgia, and Florida. The company has been recognized for its robust performance during severe weather including Hurricane Katrina, wherein SouthernLINC had recovered to 100% system availability within 72 hours of landfall. History Roy Barron, long time Southern Company veteran, was the company's first president. His team including long time Southern Company veteran Danny Moore as CFO, Harold Gwinn from Alabama Power as VP of Engineering, and Jeffrey Brooks, previously with Vanguard Cellular Systems, as SVP Sales Marketing and Service. Southern Communications had its corporate headquarters in Atlanta, while billing and switching facilities were concentrated in Birmingham. Southern Linc started as Motorola iDEN network with a broad dealer base. In 2015, Southern ...
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Time-division Multiple Access
Time-division multiple access (TDMA) is a channel access method for shared-medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot. This allows multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity. Dynamic TDMA is a TDMA variant that dynamically reserves a variable number of time slots in each frame to variable bit-rate data streams, based on the traffic demand of each data stream. TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced Cordless Telecommunications (DECT) standard for portable phones. TDMA was first used in satellite communication systems by Western Union in its Westar 3 communications sat ...
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Trunked Radio System
A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a ''talkgroup'') with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time talking. These systems typically have access to multiple channels, up to 40-60, so multiple groups in the same area can communicate simultaneously. In a conventional (non-trunked) system, channel selection is done manually; before use the group must decide which channel to use, and manually switch all the radios to that channel. This is an inefficient use of scarce radio channel resources because the user group must have exclusive use of their channel regardless of how much or how little they are transmitting. There is also nothing to prevent multiple groups in the same area from choosing the same channel, causing conflicts and 'cross-talk ...
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Telus Mobility
Telus Mobility (normally typeset as TELUS Mobility) is a Canadian wireless network operator and a division of Telus Communications which sells wireless services in Canada on its numerous networks. It operates 5G, LTE and HSPA+ on its mainstream networks. Telus Mobility is the second-largest wireless carrier in Canada, with 10.6 million subscribers as of Q3 2020. Since 2008, Telus has operated a flanker brand named Koodo Mobile, which is targeted at high school, college and university students. History 1980s In 1983, AGT Mobility was formed by Alberta Government Telephones (the predecessor to Telus) to provide a 1G analogue mobile network for Alberta's natural resources industries. It was the first mobile phone network in Canada. Analogue services became available to the general public in 1986. 1990s In 1992, AGT launched North America's first digital mobile network. Following the merger of Telus with BC Tel in 1999, Telus Mobility expanded its coverage to British ...
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El Salvador
El Salvador (; , meaning " The Saviour"), officially the Republic of El Salvador ( es, República de El Salvador), is a country in Central America. It is bordered on the northeast by Honduras, on the northwest by Guatemala, and on the south by the Pacific Ocean. El Salvador's capital and largest city is San Salvador. The country's population in 2022 is estimated to be 6.5 million. Among the Mesoamerican nations that historically controlled the region are the Lenca (after 600 AD), the Mayans, and then the Cuzcatlecs. Archaeological monuments also suggest an early Olmec presence around the first millennium BC. In the beginning of the 16th century, the Spanish Empire conquered the Central American territory, incorporating it into the Viceroyalty of New Spain ruled from Mexico City. However the Viceroyalty of Mexico had little to no influence in the daily affairs of the isthmus, which was colonized in 1524. In 1609, the area was declared the Captaincy General of Guatemal ...
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Singapore
Singapore (), officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, bordering the Strait of Malacca to the west, the Singapore Strait to the south, the South China Sea to the east, and the Straits of Johor to the north. The country's territory is composed of one Singapore Island, main island, List of islands of Singapore, 63 satellite islands and islets, and Pedra Branca, Singapore, one outlying islet; the combined area of these has increased by 25% since the country's independence as a result of extensive land reclamation projects. It has the List of countries and dependencies by population density, third highest population density in the world. With a multicultural population and recognising the need to respect cultural identities of the major ethnic groups within the nation, Singapore has four Languages ...
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Israel
Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated on the southeastern shore of the Mediterranean Sea and the northern shore of the Red Sea, and shares borders with Lebanon to the north, Syria to the northeast, Jordan to the east, and Egypt to the southwest. Israel also is bordered by the Palestinian territories of the West Bank and the Gaza Strip to the east and west, respectively. Tel Aviv is the economic and technological center of the country, while its seat of government is in its proclaimed capital of Jerusalem, although Israeli sovereignty over East Jerusalem is unrecognized internationally. The land held by present-day Israel witnessed some of the earliest human occupations outside Africa and was among the earliest known sites of agriculture. It was inhabited by the ...
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