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Old 07-25-2011, 04:33 PM   #1
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Default White space better than the extra mighty Wi-Fi

Those days ahead cord and satellite TV television have the impression of the elderly, may be surprising, why the old analog television, extra than half of the aisle seems to be disappearing. In appending, Channel 2, the original channel regulator in the rest of the high frequency channel number, commonly merely 3-13 weird. Why? Because VHF radio, two analog frequency channel must keep among the absence,Lacoste Shua Lace Shoes, in order no to interfere with contiguous channels. When the UHF broadcast occurs, every channel For the same cause,Lacoste Arin Patent Shoes, too joined a free Some places, this ambition go with the laze frequency channel separating the Mobile call workers and additional potential consumers of wireless spectrum, has long been coveted because TV free channels. In the U.S., behind two years of heated controversy, in Washington DC, Federal Communications Commission (FCC), and eventually put into use for the empty orchestra gave the green light. In 2008, the Federal Communications Commission voted, 54MHz to 806MHz (ie 2 channels to 69 channels) frequency band and the breach between how the various parts of the redistribution of idle channel, the band in June 2009, the United States last analogue TV transmitter machine switch to digital broadcasts may not longer needed. With analog transportation, digital signals will not be different Result, merely a digital television broadcasting corporation is immediately converting half of the spectrum before the grasp. But this did no discourage in array to reserve the untouched white space, and obtain badly beaten. Most television broadcasters have developed intent maneuvers to use these bands to sell to the public information service. But likewise impossible. On the contrary, the Federal Communications Commission has digital transition as one chance to release great sums of bandwidth to agreeable use by others. The largest part of the frequency amount, this is the 700MHz band (alternatively 52 channels to 69 channels), has been auctioned off to mobile call operators. One of Verizon, AT & T and other carriers paid nearly $ 20 billion, has won the main spectrum. The reasons for these channels so precious and terrestrial cause why they accepted transfer its semaphore a few miles, carrying colossal values of message, from climate and foliage achieve, yet also perforate the wall, all the loudspeaker into the building interior nook. Empty out the following vacant 700MHz band public without permission, may be capable to use. Federal Communications Commission to do so, I wish peeve dissimilar round of wireless revolution the revolution, than approximately a ten-year antecedent that broke out extra waves surging wag of innovation. At that time, Wi-Fi, Bluetooth and other wireless technology uses the 2.4GHz unlicensed frequency bands, these bands could have been reserved for microwave ovens, newborn alarm and remote garage door prologue devices. The inconsistency is that the frequency of creature released (ie, under the empty 700MHz band), will allow many higher file rates. Latest version is cried Wi-Fi 802.11n, the data rate of up to 160 ~ 300Mbps. The pearly space devices by data rates as high as anticipated to 400 ~ 800Mbps. And, Wi-Fi signal displacement about 100 meters, it gradually faded, likened with blank range the scatter spectrum signal may be several kilometers. White space apparatus enthusiasts approximately these devices for Internet way to provide Others dispute that it tin replace mobile call. When the wireless regional area limited to a few coffee shops, but covers the whole college, so anybody beautiful phone (escaping Skype or other similar applications) users will enjoy free wireless network operators are not subject to limitations. However, before all this occurred, there was a lot of technical challenges to overcome. First, the blank band transmitter to avert interference with local television stations also must prevent the same meeting apartment, playgrounds,Buy Lacoste Shoes, theaters and mosques to use the wireless microphone interference. As the small band gap device is pushed behind and ahead across the metropolis, so its use will change the channel, which channels the characteristic use depends on this device in which a number of transmitters in close. Communication with the chief access tower, then you must jump from an channel to dissimilar channel it should use the channel with all the other client devices negotiation, agreeable to look whether these devices tin also emulate suit. If a fashionable network device (client device will persist to web or off-grid), and happened approach a transmitter, then this access to the tower and brought a number of clients, will must find another frequency down its entirely Use the channel without reasoning interference. This enumeration problem is not insignificant. Test white space devices secondhand in the model, the estate in the observation channel TV, Han did not encounter difficulty. In common, these channels to occupy the necessitated signal strength, not to the TV shade shows one picture of one-thousandth of the lusted signal strength. In other words,Lacoste Camden Shoes, these prototypes can be done on the floor even on TV do not even generate a sunny spot, you can jump from one channel to subjugate a empty channel. Even so, this equipment maker said, though technically feasible, but the revelation of eccentric process ponderous, guiding white space devices complicated and valuable, completely needless. Federal Communications Commission seems to admit with this outlook. In September this annual, a conference, members balloted unanimously to cede the requirements of this spectrum to find, let solo a blank band network equipment manufacturers database query technology, will be able to find empty channels. Meanwhile,Womens Lacoste Carnaby Shoes, the wireless microphone is also assigned two of their own channel. Federal Communications Commission has opened a green light, white space equipment contractors immediately ambition to work in the band phones, laptops, pill PCs and other small devices required technology chips will be available in the afterward year began. Next,Lacoste Radiate Croc Shoes, the blank spectrum of purchaser goods may shock the retail market before the end of 2012. If the development process of Wi-Fi can be used as reference, then the blank band network can change people's lives, work and distraction. And now it needs equitable a trendy outstanding name only.
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