Wireless Telephone
Wireless Telephone
wireless telephone
This write up is about the different types of wireless telephone systems that exist today. These come in four distinct flavours, semi cordless, cordless, mobile, and satellite systems.
Semi cordless telephones – These phones work as either cordless or wireless telephones, depending where they are being used. The wireless communication, works by using radio waves, activates when the telephone 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 limited to a confined area which is determined by the location of its base station. The base station is physically connected 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 telephone needs to communicate with a nearby 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 world) is used by the mobile system to communicate with others.
The satellite telephone system – Generally too cumbersome for every day use, these telephones use satellites in order to communicate with the rest of the world, and consist of a sizeable hand held that tends to be quite a lot bigger than mobile / cell phones, and require a satellite dish in order to be able to pick up and transmit the signals. They tend to be used in locations where there are no cell networks, such as expeditions into remote and inhospitable lands (south American 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 it could be 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 limited 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 / cell phone, probably the freest of all, can only work in areas supporting cell technology (cell sites in place supporting the cell operator/service provider). All these technologies combined, there is hardly a place on earth where communication with others, those beyond the limitations of natural sight and sound (the unaided eye and ear), is not possible.
By Charles A Edwards
Article Source: ezinearticles.com
