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33 Centimeters
The 33-centimeter or 900 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio on a secondary basis. It ranges from 902 to 928 MHz and is unique to ITU Region 2. It is primarily used for very local communications as opposed to bands lower in frequency. However, very high antennas with high gain have shown 33 centimeters can provide good long-range communications almost equal to systems on lower frequencies such as the 70 centimeter band. The band is also used by industrial, scientific, and medical (ISM) equipment, as well as low-powered unlicensed devices. Amateur stations must accept harmful interference caused by ISM users but may receive protection from unlicensed devices. The 900 MHz frequency is also used as a reference band e.g. to express the total power or impact of the electric field "E" - expressed in V/m - or the power density "S" - expressed in W/m2 - of the overall cellular frequencies emission caused by all freque ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;" (either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety (such as police and fire), or professional two-way radio services (such as maritime, aviation, taxis, etc.). The amateur radio service (''amateur service'' and '' amateur-satellite service'') is established by the International Telecommunication Union (ITU) through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station licenses with a unique identifying call sign, which mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WaveLAN
WaveLAN was a brand name for a family of wireless networking technology sold by NCR, AT&T, Lucent Technologies, and Agere Systems as well as being sold by other companies under OEM agreements. The WaveLAN name debuted on the market in 1990 and was in use until 2000, when Agere Systems renamed their products to ORiNOCO. WaveLAN laid the important foundation for the formation of IEEE 802.11 working group and the resultant creation of Wi-Fi. WaveLAN has been used on two different families of wireless technology: * Pre-IEEE 802.11 WaveLAN, also called ''Classic WaveLAN'' * IEEE 802.11-compliant WaveLAN, also known as ''WaveLAN IEEE'' and ''ORiNOCO'' History WaveLAN was originally designed by NCR Systems Engineering, later renamed into WCND (Wireless Communication and Networking Division) at Nieuwegein, in the province Utrecht in the Netherlands, a subsidiary of NCR Corporation, in 1986–7, and introduced to the market in 1990 as a wireless alternative to Ethernet and Token Ring. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nextel
Nextel Communications, Inc. was an American wireless service operator that merged with and ceased to exist as a subsidiary of Sprint Corporation, which would later be bought by T-Mobile, T-Mobile US and folded into that company. Nextel in Brazil, and formerly in Argentina, Chile, Peru, the Philippines, and Mexico, is part of NII Holdings, a stand-alone, publicly traded company not owned by Sprint Corporation. Nextel Communications traces its roots to the 1987 foundation of FleetCall by Morgan E. O'Brien, Morgan O'Brien, Brian McAuley, Chris Rogers, and Peter Reinheimer. FleetCall changed its name to Nextel Communications, Inc. in 1993. Nextel provided digital, wireless communications services, originally focusing on the fleet and dispatch customers, but later marketed to all potential wireless customers. Nextel's network operated in the 800-MHz Specialized Mobile Radio band and used iDEN technology developed by Motorola. Nextel's iDEN network offered a then unique push-to-talk "wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cognitive Radio
A cognitive radio (CR) is a radio that can be programmed and configured dynamically to use the best wireless channels in its vicinity to avoid user interference and congestion. Such a radio automatically detects available channels in wireless spectrum, then accordingly changes its transmission or reception parameters to allow more concurrent wireless communications in a given spectrum band at one location. This process is a form of dynamic spectrum management. Description In response to the operator's commands, the cognitive engine is capable of configuring radio-system parameters. These parameters include "waveform, protocol, operating frequency, and networking". This functions as an autonomous unit in the communications environment, exchanging information about the environment with the networks it accesses and other cognitive radios (CRs). A CR "monitors its own performance continuously", in addition to "reading the radio's outputs"; it then uses this information to "determine t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
XMax
Vislink Technologies, Inc. is an American technology company that specializes in the collection, delivery, management and distribution of high quality live video and data. Founded as xG Technology in Sarasota, Florida in 2002, the company had acquired both Vislink and Integrated Microwave Technologies by 2017. In February 2019, xG Technology formally changed its name to Vislink Technologies. The company is headquartered in Hackettstown, New Jersey and has regional offices in Billerica, Massachusetts and Anaheim, California, as well as global offices in the United Kingdom, Dubai and Singapore. Vislink is a publicly traded company listed on the NASDAQ Capital Market. Vislink has created a portfolio of intellectual property that includes cognitive radio, interference mitigation and self-organizing wireless network technologies for mobile services using licensed or unlicensed radio spectrum. In November 2020, Vislink was named a Deloitte Technology Fast 500 winner, and was among the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Line-of-sight Propagation
Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves travel in a direct path from the source to the receiver. Electromagnetic transmission includes light emissions traveling in a straight line. The rays or waves may be diffracted, refracted, reflected, or absorbed by the atmosphere and obstructions with material and generally cannot travel over the horizon or behind obstacles. In contrast to line-of-sight propagation, at low frequency (below approximately 3 MHz) due to diffraction, radio waves can travel as ground waves, which follow the contour of the Earth. This enables AM radio stations to transmit beyond the horizon. Additionally, frequencies in the shortwave bands between approximately 1 and 30 MHz, can be refracted back to Earth by the ionosphere, called skywave or "skip" propagation, thus giving radio transmissions in this range a potentially global reach. However, at frequencies above ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wireless Internet Service Provider
A wireless Internet service provider (WISP) is an Internet service provider with a network based on wireless networking. Technology may include commonplace Wi-Fi wireless mesh networking, or proprietary equipment designed to operate over open 900 MHz, 2.4 GHz, 4.9, 5, 24, and 60 GHz bands or licensed frequencies in the UHF band (including the MMDS frequency band), LMDS, and other bands from 6 GHz to 80 GHz. In the US, the Federal Communications Commission (FCC) released Report and Order, FCC 05-56 in 2005 that revised the FCC’s rules to open the 3650 MHz band for terrestrial wireless broadband operations. On November 14, 2007 the Commission released Public Notice (DA 07-4605) in which the Wireless Telecommunications Bureau announced the start date for licensing and registration process for the 3650-3700 MHz band. As of July 2015, there are over 2,000 fixed wireless broadband providers operating in the US, servicing nearly 4 million customers. History Ini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorola Canopy
Cambium Networks is a wireless infrastructure provider that offers fixed wireless and Wi-Fi to broadband service providers and enterprises to provide Internet access. An American telecommunications infrastructure company, it provides wireless technology, including Enterprise WiFi, switching solutions, Internet of Things, and fixed wireless broadband and Wi-Fi for enterprises. Publicly traded on the NASDAQ stock exchange, it spun out of Motorola in October 2011. Products Cambium Networks manufactures point-to-point backhaul, point-to-multipoint communication wide area network (WAN), Wi-Fi indoor and outdoor access, and cloud-based network management systems. In 2020, the company collaborated with Facebook to add mesh networking technology Terragraph that allows high-speed internet connections where laying fiber optic cable is not viable. As of 2021 the company has shipped 10 million radios. Products are available in point-to-point and point-to-multipoint configur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ricochet (internet Service)
Ricochet was one of the first wireless Internet access services in the United States, before Wi-Fi, 3G, and other technologies were available to the general public. It was developed and first offered by Metricom Incorporated, which shut down in 2001. The service was originally known as the Micro Cellular Data Network, or MCDN, gaining the Ricochet name when the service was launched to the public. History Metricom was founded in 1985, initially selling radios to electric, gas, oil, and water industrial customers. The company was founded by Dr. David M. Elliott and Paul Baran. Paul Allen took a controlling stake in Metricom in 1997. Service began in 1994 in Cupertino, California, and was deployed throughout Silicon Valley (the northern part of Santa Clara Valley) by 1995, the rest of the San Francisco Bay Area by 1996, and to other cities throughout the end of the 1990s. By this time, the service was operating at roughly the speed of a 56 kbit/s dialup modem. Ricochet introduced ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alvarion BreezeACCESS
Alvarion Technologies is a global provider of autonomous Wi-Fi networks designed with self-organizing capabilities for carrier-grade Wi-Fi, enterprise connectivity, smart city planning, smart hospitality, connected campuses, and connected events. History Alvarion was originally incorporated as BreezeCOM Ltd. in September 1992. In March 2000, BreezeCOM had an initial public offering, selling 5 million shares of its common stock at a price of $20 per share. BreezeCOM's shares were listed on the NASDAQ under the symbol BRZE. In August 2001, BreezeCOM merged with another Israeli company, Floware Wireless Systems Ltd. (NASDAQ: FLRE), which was founded in 1993, changing its name to Alvarion. In April 2003, Alvarion acquired InnoWave ECI Wireless Systems Ltd, from ECI Telecom. In July 2003, Alvarion signed a strategic partnership agreement with Intel to co-develop WiMAX based Broadband wireless access systems, using Intel's WiMAX chips. In December 2004, Alvarion acquired interWAVE ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
