Products using the IEEE 802.11 WLAN standards are marketed under the Wi-Fi brand name. Fixed wireless technology implements point-to-point links between computers or networks at two distant locations, often using dedicated microwave or modulated laser light beams over line of sight paths. It is often used in cities to connect networks in two or more buildings without installing a wired link.
"Now, the industry accepts a handful of different wireless technologies. Each wireless technology is defined by a standard that describes unique functions at both the Physical and the Data Link layers of the OSI Model. These standards differ in their specified signaling methods, geographic ranges, and frequency usages, among other things. Such differences can make certain technologies better suited to home networks and others better suited to network larger organizations."
Wireless access points are also often close to humans, but the drop off in power over distance is fast, following the inverse-square law. The HPA's position is that “...radio frequency (RF) exposures from WiFi are likely to be lower than those from mobile phones.” It also saw “...no reason why schools and others should not use WiFi equipment.” In October 2007, the HPA launched a new “systematic” study into the effects of WiFi networks on behalf of the UK government, in order to calm fears that had appeared in the media in a recent period up to that time". Dr Michael Clark, of the HPA, says published research on mobile phones and masts does not add up to an indictment of WiFi.
ar:شبكة لاسلكية bs:Bežično umrežavanje ca:Xarxa sense fil cs:Bezdrátová síť da:Radionet de:Kabellose Übertragungsverfahren et:Traadita võrk el:Ασύρματο δίκτυο es:Red inalámbrica eo:Sendrata reto eu:Haririk gabeko sare fr:Réseau sans fil gl:Rede sen fíos ko:무선 네트워크 hr:Bežične mreže is:Þráðlaust net mk:Безжична мрежа nl:Draadloos netwerk ja:無線アクセス pt:Rede sem fio ro:Rețea fără fir ru:Беспроводные компьютерные сети sr:Бежичне мреже sv:Trådlöst nätverk uk:Бездротова мережа zh:无线网络
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A repair technician might work in a corporate information technology department, a central service center, or a retail computer sales environment. A public sector technician might work in the military, national security or law enforcement communities, health or public safety field, or an educational institution. Despite the vast variety of work environments, all computer technicians perform similar physical and investigative processes, including technical support. Experienced technicians might specialize in fields such as data recovery, system administration, or information systems. Some technicians are self-employed or own a firm that provides services in a regional area. Some are subcontracted as freelancers or consultants. This type of technician ranges from hobbyists and enthusiasts that volunteer or make a little side money, to those who work professionally in the field.
The repair of problems can range from a minor setting that is incorrect, to spyware, viruses, and as far as replacing hardware or an entire operating system. Some technicians provide on-site services usually at an hourly rate. Others can provide services off-site, where the client can drop off at the repair shop. Some have pickup and drop off services for convenience. Some may also take back old equipment for recycling (In the EU, this is required under WEEE rules).
Category:Computer occupations Computer repair technician Category:Technicians
he:טכנאי מחשביםThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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