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what is wireless
Wireless is a term used to describe telecommunications in which electromagnetic waves (rather than some form of wire) carry the signal over part or all of the communication path. Some monitoring devices, such as intrusion alarms, employ acoustic waves at frequencies above the range of human hearing; these are also sometimes classified as wireless.
The first wireless transmitters went on the air in the early 20th century using radiotelegraphy (Morse code). Later, as modulation made it possible to transmit voices and music via wireless, the medium came to be called “radio.” With the advent of television, fax, data communication, and the effective use of a larger portion of the spectrum, the term “wireless” has been resurrected.
Common examples of wireless equipment in use today include:
Cellular phones and pagers — provide connectivity for portable and mobile applications, both personal and business
Global Positioning System (GPS) — allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth
Cordless computer peripherals — the cordless mouse is a common example; keyboards and printers can also be linked to a computer via wireless
Cordless telephone sets — these are limited-range devices, not to be confused with cell phones
Home-entertainment-system control boxes — the VCR control and the TV channel control are the most common examples; some hi-fi sound systems and FM broadcast receivers also use this technology
Remote garage-door openers — one of the oldest wireless devices in common use by consumers; usually operates at radio frequencies
Two-way radios — this includes Amateur and Citizens Radio Service, as well as business, marine, and military communications
Baby monitors — these devices are simplified radio transmitter/receiver units with limited range
Satellite television — allows viewers in almost any location to select from hundreds of channels
Wireless LANs or local area networks — provide flexibility and reliability for business computer users
Wireless technology is rapidly evolving, and is playing an increasing role in the lives of people throughout the world. In addition, ever-larger numbers of people are relying on the technology directly or indirectly. (It has been suggested that wireless is overused in some situations, creating a social nuisance.) More specialized and exotic examples of wireless communications and control include:
Global System for Mobile Communication (GSM) — a digital mobile telephone system used in Europe and other parts of the world; the de facto wireless telephone standard in Europe
General Packet Radio Service (GPRS) — a packet-based wireless communication service that provides continuous connection to the Internet for mobile phone and computer users
Enhanced Data GSM Environment (EDGE) — a faster version of the Global System for Mobile (GSM) wireless service
Universal Mobile Telecommunications System (UMTS) — a broadband, packet-based system offering a consistent set of services to mobile computer and phone users no matter where they are located in the world
types of wireless
his tutorial explains Wireless Network types (WLANS, WPANS, WMANS and WWANS) and Wireless network terminology (Ad hoc mode, Infrastructure mode, BSS, ESS, BSA, SSID, WEP, EAP, WPA, WPA2, Infrared, Bluetooth, FHSS, DSSS, FHSS, OFDM, MIMO, RF, Omni directional, 802.11g, 802.11a and 802.11h ) in detail.
all wireless price in bangladesh
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