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Frequency Sharing
In telecommunication, frequency sharing or channel sharing is the assignment to or use of the same radio frequency by two or more stations that are separated geographically or that use the frequency at different times. It reduces the potential for mutual interference where the assignment of different frequencies to each user is not practical or possible. Channel sharing in digital television U.S. mobile data usage in 2017 was 40 times that in 2010, forcing frequencies to be reallocated. The FCC's 2016 auction allowed two or more stations to share a single 6 MHz television channel while retaining their licenses and all rights. NBC sold the spectrum of three of its stations in the 2017 FCC auction: WNBC WNBC (channel 4) is a television station in New York City, serving as the flagship of the NBC network. It is owned and operated by the network's NBC Owned Television Stations division alongside Linden, New Jersey–licensed Telemundo stati ... New York, Telemundo WSN ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telecommunication
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that feasible with the human voice, but with a similar scale of expediency; thus, slow systems (such as postal mail) are excluded from the field. The transmission media in telecommunication have evolved through numerous stages of technology, from beacons and other visual signals (such as smoke signals, semaphore telegraphs, signal flags, and optical heliographs), to electrical cable and electromagnetic radiation, including light. Such transmission paths are often divided into communication channels, which afford the advantages of multiplexing multiple concurrent communication sessions. ''Telecommunication'' is often used in its plural form. Other examples of pre-modern long-distance communication included audio messages, such as coded d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Frequency
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies; these are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves. Different sources specify different upper and lower bounds for the frequency range. Electric current Electric currents that oscillate at radio frequencies (RF currents) have special properties not shared by direct current or lower audio frequency alternating current, such as the 50 or 60 Hz current used in electrical power distribution. * Energy from RF currents in conductors can radiate into space as electromagnetic waves ( radio waves). This is the basis of radio technology. * RF current does not penetrate deeply into ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Frequency Interference
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction. The disturbance may degrade the performance of the circuit or even stop it from functioning. In the case of a data path, these effects can range from an increase in error rate to a total loss of the data. Both man-made and natural sources generate changing electrical currents and voltages that can cause EMI: ignition systems, cellular network of mobile phones, lightning, solar flares, and auroras (northern/southern lights). EMI frequently affects AM radios. It can also affect mobile phones, FM radios, and televisions, as well as observations for radio astronomy and atmospheric science. EMI can be used intentionally for radio jamming, as in electronic warfare. History Since the earliest days of radio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
User (telecommunications)
In telecommunications, a user is a person, organization, or other entity that employs the services provided by a telecommunication system, or by an information processing system, for transfer of information. A user functions as a source or final destination of user information, or both. A user ''may'' also be the subscriber, i.e. the customer paying for the service. User is also a person or process accessing an AIS by direct connections (e.g., via terminals) or indirect connections. "Indirect connection" relates to persons who prepare input data or receive output that is not reviewed for content or classification by a responsible individual. Sources * {{FS1037C MS188 * National Information Systems Security Glossary See also * User (computing) A user is a person who utilizes a computer or network service. A user often has a user account and is identified to the system by a username (or user name). Other terms for username include login name, screenname (or screen n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CTIA (organization)
CTIA is a trade association representing the wireless communications industry in the United States. The association was established in 1984 and is headquartered in Washington, D.C. It is a 501(c) organization#501.28c.29.286.29, 501(c)(6) nonprofit membership organization, and represents Mobile network operator, wireless carriers and suppliers, and manufacturers and providers of wireless products and services. CTIA operates certification programs for the Wireless Industrial Networking Alliance, wireless industry and publishes wireless industry surveys. It has also sponsored various public service initiatives related to wireless. It was originally known as the Cellular Telecommunications Industry Association until 2004, and later the Cellular Telecommunications and Internet Association. The organization has since operated under its initialism only, but subtitled as CTIA – The Wireless Association until 2015. History CTIA was established in May 1984 as the Cellular Telecommunic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2016 United States Wireless Spectrum Auction
The 2016 United States wireless spectrum auction, officially known as Auction 1001, allocated approximately 100 MHz of the United States Ultra High Frequency (UHF) spectrum formerly allocated to UHF television in the 600 MHz band. The spectrum auction and subsequent reallocations were authorized by Title VI (The Spectrum Act) of the payroll tax cut extension passed by the United States Congress on February 17, 2012. Background The 2008 United States wireless spectrum auction, dealing with allocations for UHF television in the 700 MHz band, generated $19.6 billion from companies such as AT&T and Verizon Communications. This auction re-allocated the UHF space formerly occupied by channels 52–69, after the completion of the primary digital television transition in the United States from NTSC to ATSC in 2009. In effect, the digital transition had eliminated 25% of the space allocated for UHF television in the United States. Wireless broadband internet access interest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WNBC
WNBC (channel 4) is a television station in New York City, serving as the flagship of the NBC network. It is owned and operated by the network's NBC Owned Television Stations division alongside Linden, New Jersey–licensed Telemundo station WNJU (channel 47). WNBC's studios and offices are co-located with NBC's corporate headquarters at 30 Rockefeller Plaza in Midtown Manhattan; WNJU's facilities in Fort Lee, New Jersey, also serve as WNBC's New Jersey news bureau. Through a channel sharing agreement with WNJU, the two stations transmit using WNJU's spectrum from an antenna atop One World Trade Center. WNBC holds the distinction as the oldest continuously operating commercial television station in the United States. History Experimental operations What is now WNBC traces its history to experimental station W2XBS, founded by the Radio Corporation of America (RCA, a co-founder of the National Broadcasting Company), in 1928, just two years after NBC was founded as th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WSNS
WSNS-TV (channel 44) is a television station in Chicago, Illinois, United States, airing programming from the Spanish-language Telemundo network. It is owned and operated by NBCUniversal's Telemundo Station Group alongside NBC outlet WMAQ-TV (channel 5); it is also sister to regional sports network NBC Sports Chicago. WSNS-TV and WMAQ-TV share studios at the NBC Tower on North Columbus Drive in the city's Streeterville neighborhood and transmitter facilities atop the Willis Tower in the Chicago Loop. WSNS-TV began broadcasting in 1970. Originally specializing in the automated display of news headlines, it evolved into Chicago's third full-fledged independent station, carrying local sports, movies, and other specialty programming. This continued until 1980, when WSNS became the Chicago-area station for the subscription television (STV) service ON TV, whose owner, Oak Industries, took a minority ownership stake in the station. While ON TV was successful in Chicago and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WWSI
WWSI (channel 62) is a television station licensed to Mount Laurel, New Jersey, United States, broadcasting the Spanish-language Telemundo network to the Philadelphia area. It is owned and operated by NBCUniversal's Telemundo Station Group alongside NBC outlet WCAU (channel 10); it is also sister to regional sports network NBC Sports Philadelphia. WWSI and WCAU share studios within the Comcast Technology Center on Arch Street in Center City, with some operations remaining at their former main studio at the corner of City Avenue and Monument Road in Bala Cynwyd, along the Philadelphia– Montgomery county line. Through a channel sharing agreement, the two stations transmit using WCAU's spectrum from a tower in the Roxborough section of Philadelphia. History Prior to the station's formal sign-on, channel 62's original owners held a construction permit under the WDKZ call letters beginning on September 9, 1987, which subsequently changed to WACI that same year. In 2000, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
YouTube
YouTube is a global online video sharing and social media platform headquartered in San Bruno, California. It was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim. It is owned by Google, and is the second most visited website, after Google Search. YouTube has more than 2.5 billion monthly users who collectively watch more than one billion hours of videos each day. , videos were being uploaded at a rate of more than 500 hours of content per minute. In October 2006, YouTube was bought by Google for $1.65 billion. Google's ownership of YouTube expanded the site's business model, expanding from generating revenue from advertisements alone, to offering paid content such as movies and exclusive content produced by YouTube. It also offers YouTube Premium, a paid subscription option for watching content without ads. YouTube also approved creators to participate in Google's AdSense program, which seeks to generate more revenue for both parties ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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