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s write up is about the various types of wireless telephone systems that exist today. These come in four distinct flavours, semi cordless, cordless, mobile, and [url=http://www.ugg-boot-2013.com/]www.ugg-boot-2013.com/[/url] satellite systems.
Semi cordless telephones - [url=http://www.ugg-boot-2013.com/]Uggs Black Friday[/url] These phones work as either cordless or wireless telephones, depending where they're being used. The wireless communication, works by using radio waves, activates when the phone is out of range of its base station. When within range of its base station it becomes a cordless telephone.
The cordless telephone - These are restricted to a confined area which is established by the location of [url=http://www.ugg-boot-2013.com/]Ugg Boots Outlet[/url] its base station. The base station is physically coupled to the telephone network and to a power source. The cordless phones can use the telephone network as long as it is in range of its base station.
Mobile / Cell telephones - These types of phones use both radio and cell technology to communicate. Radio is used only when the phone needs to communicate with a close cell site (a node in a cell network, consisting of antennas, transmitters, receivers, and other requires electronics, all mounted on a tower). The cell network ( consisting of cell sites dotted around the globe) is used by the mobile system to contact others.
The satellite telephone [url=http://www.ugg-boot-2013.com/]Uggs For Sale[/url] system - Generally too cumbersome for every day use, these telephones use satellites as a way to contact the rest of the world, and contains a sizeable hand held that will be quite a lot bigger than mobile / cellular phones, and have to have a satellite dish in order to be able to pick up and transmit the signals. They tend to be [url=http://www.ugg-boot-2013.com/]Cheap Ugg Boots[/url] used in locations where there are no cell networks, such as expeditions into remote and inhospitable lands (south American [url=http://www.ugg-boot-2013.com/]Ugg Boots For Women[/url] Jungle, ice wastes of the poles, etc.). The satellite dish needs to accompany the phone wherever it goes, which is fine for expeditions, but wholly unworkable in everyday life.
There we have the five types of telephone communication systems that are not physically tethered to their source, although perhaps argued that some if not all are still tethered, if only by their range of service. The satellite telephone is no good without a dish, and has a restricted range, even with a dish at hand. The semi cordless and cordless telephones have to be within the limited range of their base station (a supporting base station for the semi cordless), and the mobile / cellular phone, probably the freest of all, can only work in areas supporting cell technology (cell sites in place supporting the cell operator/ provider). All these technologies combined, there is hardly a place on earth where communication with other people, those beyond the restrictions of natural sight and sound (the unaided eye and ear), is not possible.
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