What is Wireless? Wireless enables better communication, enhances productivity and enables better customer service. A Wireless LAN allows users to access information beyond their desk, and conduct business anywhere within their offices. Wireless networks are well suited to many environments. As an extension to a wired network it allows access anywhere within your building and over vast distances outside. For locations in which it is hard to lay cable like heritage buildings or sites where new wiring can't be laid for structural reasons, wireless technologies are ideal. The initial costs of implementing a wireless LAN are less than that of traditional networking methodologies. Would the information be intercepted? WLAN features two-fold protection in security. On the hardware side, as with Direct Sequence Spread Spectrum technology (DSSS), it has the inherent security feature of scrambling. On the software side, WLAN series offer the encryption function (WEP) to enhance security and Access Control. Users can set it up depending upon their needs. Frequency Range: Frequency refers to the number of times a signal completes one cycle and is measured in Hertz. The range will determine the scope and boundary of the antennas transmission. The 2.4Ghz wireless LAN allows data rates of up to 11Mbps. The newer 5.8Ghz wireless LAN is much faster, allowing speeds of up to 54Mbps, which is 5 times faster, then a 10BASET network. Attenuation: To reduce (the amplitude of an electrical signal) with little or no distortion. In the case of cabling the further the distance of the cable, the more the signal attenuates and weakens.  To counter this, one must have better quality connectors, better quality and larger diameter cables. Gain: An increase in signal power, voltage, or current. dBi refers to the decibels related to the Isotropic Radiator which produces a useful electromagnetic field output in all directions with equal intensity and 100% efficiency in 3 dimensional space. In the case of wireless LANs, the higher the gain the more powerful the transmitter and stronger the signal. VSWR: stands for Voltage Standing Wave Ratio. It is the ratio of the maximum/minimum values of standing wave pattern along a transmission line to which a load is connected. VSWR value ranges from 1 (matched load) to infinity for a short or an open load. For most wireless LAN antennas the maximum acceptable value of VSWR is 2.0. VSWR of 1.5 or less is excellent. This is approximately the same as a Return Loss of 14.5 dB. What this means is that most of the signal from the transmitter to the wireless antenna is being radiated. (96% radiated and 4% reflected) A VSWR of 2.0, (return loss of 9.5 dB), means that 90% is radiated and 10% is reflected.

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