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The issue of other devices and wireless services interfering with your wireless network can be the biggest barrier to a successful implementation There are both technical and social engineering means of determining if wireless networking might work The first technical method is to simply acquire one access point and one client wireless network card, preferably on a laptop personal computer (PC), and set up a simple wireless connection to an existing network Walk around with the laptop and try to use the network
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in as many places of interest as possible Many of the client-side adapters include signal strength monitoring software so that you can see how strong and reliable your wireless connection will be If you approach a piece of equipment that interferes with the wireless signal, your received signal strength will probably drop below acceptable levels and you will lose your connection to the network Loss of connection may be intermittent, rather than based on a specific location or simply proximity to other equipment, and this may be an indication that another wireless service or an appliance that affects your signal is in use nearby Pay attention to this when microwave ovens and special equipment may be in use more often than at other times Of course, interference from the microwave oven in the company cafeteria is a great excuse to stop working, take a break, and get away from the computer More technical, often preferred, and hyped by many wireless networking consultants is a complete radio frequency (RF) site survey performed with a spectrum analyzer a highly technical piece of test equipment that can see details of both large and small portions of RF spectrum identifying, qualifying, and quantifying the types of signals it receives In some cases, the analyzer can also tell you what type of signal is being received, if it is not obvious by the visual display and characteristics of the spectrum Unless the received signal can be demodulated to reveal the information within, and that information contains the identity of who is responsible for the transmission, it may be impossible to tell who is generating that signal Moving the spectrum analyzer s antenna closer to or farther from different areas, or using a directional antenna, can tell you proximity or locate the transmitting device A spectrum analysis may not be conclusive evidence as to whether the site will accommodate wireless networking, because 80211a and 80211b use sophisticated modulation and signal processing techniques, a signal may get through 100 percent of the time even in the presence of interference You will only know by trying it Conversely, unless a spectrum analyzer is present and monitoring the right portion of the RF spectrum for several days, a typical 1 2 hour quick check of a site may miss very significant interference that could render your network useless for several minutes or hours Similarly, a clean, interference-free site today could become cluttered with new interference as other networks, appliances, or services come online nearby
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To enhance your confidence in your site s ability to accommodate wireless, do a little walk-around/talk-around investigation, and not just before you install your system Do so frequently to help determine if nearby building tenants, new occupants, or other sources of interference are about to be introduced into your environment
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One of the most common questions about wireless is, How far will it go As with most answers about technical things, it depends 80211b was designed with native, unmodified, unenhanced devices to extend the length of a 10BaseT Ethernet wire by 300 meters This equals 985 feet, about a city block, or 018 miles Unobstructed, unimpeded with line-of-sight, 80211b will do just that and probably more But who is going to hold their laptops above their heads or mount an access point itself on a rooftop to communicate digitally In most real-world cases, two native 80211a devices will do well to clear 100 feet before the signals fade or are reflected too much to make a reliable connection You may be able to add external antennas to your wireless equipment, overcome obstructions, and generally improve near-field penetration or increase range If you simply need to improve straight distance range, look for a directional antenna, or a pair of them, to provide approximately 8, 12, or 16 dB of signal gain These may provide up to 10 12 miles of range between devices not bad if you want to walk around a city park with a directional antenna attached to your laptop, attracting the attention of others To get this kind of range, one of the devices needs to be mounted high above surrounding terrain and buildings which means finding space at a commercial radio site or a friend s house atop a hill or highrise building (I would be keenly interested to know if anyone successfully builds a solar-powered access or relay point and hides it in a tree someplace just to prove that wireless can be free and everywhere) If that meager 100 feet of coverage around your office bothers you, or you cannot seem to stay connected to the LAN during critical presentations in the conference room, then installing an omnidirectional antenna with 3 6 dB of gain will add penetration Remember, the primary intent of wireless is to get you off the 10BaseT CAT 5 cable tether Stretching that invisible nonwire to cover
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