Wireless Networks Essay Example | Topics and Well Written Essays - 1250 words

Wireless Networks - Essay Example(B)Radio frequency is a term that refers to alternating original (AC) having characteristics such that, if the current is input to an antenna, an electromagnetic (EM) field is generated suitable for wireless political programing and/or communications. These frequencies cover a significant portion of the electromagnetic beam of light spectrum, extending from nine kilohertz (9 kHz),the lowest allocated wireless communications frequency (its within the range of human hearing), to thousands of gigahertz(GHz).When an RF current is supplied to an antenna, it gives rise to an electromagnetic field that propagates with space. This field is sometimes called an RF field in less technical jargon it is a radio wave. Any RF field has a wavelength that is reciprocally proportional to the frequency. In the atmosphere or in outer space, if f is the frequency in megahertz and sis the wavelength in meters, thenThe frequency of an RF signal is inversely proportional to the wavelength of the EM field to which it corresponds. At 9 kHz, the free-space wavelength is approximately 33 kilometers (km) or 21 miles (mi). At the highest radio frequencies, the EM wavelengths saloon approximately one millimeter (1 mm). As the frequency is increased beyond that of the RF spectrum, EM energy takes the form of infrared (IR), visible, ultraviolet (UV), X rays, and da Gamma rays.Many types of wireless devices make use of RF fields. ... Many types of wireless devices make use of RF fields. Cordless and cellular telephone, radio and television broadcast stations, satellite communications systems, and two-way radio services all operate in the RF spectrum. Some wireless devices operate at IR or visible-light frequencies, whose electromagnetic wavelengths are shorter than those of RF fields. Examples include most television-set remote-control boxes, some cordless computer keyboards and mice, and a few wireless hi-fi stereo headsets. (SearchNetworking.com)2. Wirele ss architectureWAP Architecture is divided into several layers. This is often called the WAP Stack. (Bharadwaj) The technical description of each layer of the wireless architecture is explained below.Wireless Application Environment (WAE)The goal of WAE is to create an environment that allows users to build applications that can be used over a wide variety of wireless systems that can be implemented efficiently. In the WAP model, WAE would be the application environments that sends and receives requests from the Clients to the Gateway to the Origin Server. WAE is composed of user agents such as browsers, text editors, date book or phonebook. WAE is also composed of scripting, higher-lever programming languages and project formats. WAE uses languages such as WML Script (similar to JavaScript) and WML (similar to HTML).Wireless Session Protocol (WSP)The Wireless Session Protocol is the layer that deals with communication between client and proxy or server. The WSP provides dialog b etween client and server. Wireless Transaction Protocol (WTP)The Wireless Transaction Protocol, in a simple definition, deals with the transaction of data. WTP handles