Examining Your Home Broadband Hookup in .NET

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8 Examining Your Home Broadband Hookup
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Figure 8-9: Wireless basic settings.
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The top pull-down menu, Wireless Network Mode, has four settings: Disable: Turn wireless support off B-only: 11 Mbps networking only Mixed: 11 Mbps and 54 Mbps networking G-only: 54 Mbps networking only This illustrates my earlier point about mixing and matching 802.11b and 802.11g products in one network. Linksys makes it easy to include both standards by selecting the Mixed mode, as I did. However, 802.11b (11 Mbps) transmissions monopolize the channel and force 802.11g (54 Mbps) to slow down. When only 802.11g devices are communicating, the speed remains high.
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Business, and especially technology, requires constant decisions. The same goes for Wi-Fi. 802.11, 802.11b, and 802.11g all use frequencies right around 2.4 GHz. That frequency range is unregulated, meaning any vendor can make products using frequencies in that range. And so many did, and not just wireless networking vendors, either.
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182 Part II Practicing Safe Broadband
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The following common items create interference for 802.11b and 802.11g products: Microwave ovens Cordless phones New Bluetooth short-range wireless devices Most interference issues can be overcome by moving the wireless access point or adding an antenna extender. That, or hope people making popcorn in the microwave nish soon. 802.11b network devices use Complementary Code Keying (CCK) modulation, relying on a single-frequency waveform. Interference on the same frequency as your network really clobbers the data throughput. 802.11a and 802.11g network devices use Orthogonal Frequency Division Multiplexing (OFDM), which splits data over multiple small subsignals and transmits them at different frequencies. This lessens the interference problem for 802.11g, but 802.11a uses a regulated frequency different from that used by microwaves and cordless phones. The 802.11g standards group was smart to grab the technical advantages of 802.11a and make them work with the 802.11b products already out in the eld. Interference doesn t kill a Wi-Fi network connection; it just slows it way down as the connection ghts through the competing radio waves. The intermittent nature of interference in the home or workplace makes it tough to track down the offending products. But focus on cordless phones and microwaves.
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Again you must take these numbers with a bit of skepticism, because distance gures rival bandwidth numbers for creative accounting. Anything that blocks a radio signal degrades the signal and shortens the distance. That anything includes interference, walls, corners, and smoke. (Okay, the last two may be a little harsh, but moving a metal le cabinet will change the radio wave pattern in an of ce.) In the best case (outdoors) at low speeds (1 Mbps), 802.11b and 802.11g can go over 500 meters. In the worst case, you won t get the high-speed connection, 54 Mbps, through even one thin interior wall. Signals go through glass better than through walls. Mounting access points higher in the room seems to increase distance. The upcoming Antennas section will provide ways to increase range. Here is a list of speeds and approximate indoor distances for 802.11g: 54 Mbps: 20 meters (65 feet) 18 Mbps: 60 meters (195 feet)
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8 Examining Your Home Broadband Hookup
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11 Mbps: 75 meters (245 feet) 1 Mbps: 125 meters (410 feet)
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Does this mean the distance and speed ratings in the marketing literature are fraudulent Absolutely not, although they are optimistic, perhaps, but not exactly fraudulent. You can cover a pretty large room at 54 Mbps if you put the access point in the center of the room and place all computers within 65 feet in any direction. Nearly 250 feet in any direction covers a pretty big warehouse at a pretty good (11 Mbps) speed rating.
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Standards, when followed, make it possible to mix and match products from different vendors into a working network. Let me tell you how it really works. The newer the standard, the less likely it is that products from different vendors will work together. Why Because all the vendors start designing their products before the standards are of cial. If they waited until every standards committee member gave thumbs up, their products would take another six months to reach the market, and the market would be full of their competitors. This standards jumping behavior infected just about every single wireless vendor in the 802.11b market as they anticipated 802.11g. It didn t make any sense to see a full shelf of 802.11g products from different vendors, all claiming to be standards based before the 802.11g standard was rati ed, but there they were. Can you take two rst-generation 802.11g products from different vendors and guarantee they will work together Absolutely not. But by the time vendors put out their second-generation products based on standards, working together becomes easier. The rst generation of 802.11b products didn t work well outside their own vendor family, but the second generation works pretty well. The second generation of 802.11g products will work the same way. Buying all your wireless network products from a single vendor isn t a bad idea, but it s hard to maintain. Your dealer runs out of stock when you need some additional equipment. The vendor changes the model line, so you no longer have the same products available. Your company buys another company, or your company is bought. Whatever the reason, you must start mixing products. Do it the smart way: Don t mix products from the rst generation of a standard. Keep products from the same vendor in the same area. Try connections at lower data rates. Get products talking before adding security settings. Look for Wi-Fi certi cation on all products.
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