Cellular telephone systems are a way of providing portable telephone services. Each phone is connected by a radio link to a base station. In turn, this is linked to the telephone network, which is the largest machine on the planet.
There is nothing special about radio links - they've been used for scores of years. What is clever is that with a cellular system, each base station covers a limited area, and if a phone moves away, the connection is passed across to an adjacent base. This is called a hand-off, and allows mobility of phones, whilst permitting re-use of frequencies by base stations in nearby, but not adjacent, 'cells'.
The size of cells varies from system to system and place to place. They can be from over 50 miles across on the analogue 'TACS' systems from Vodafone and Cellnet, to less than 500 metres in busy areas on the 'GSM 1800' networks, One2one and Orange. The smaller the cell size, the more users that can be fitted onto the network, and the less power the mobile handset needs to reach the base, so it and its batteries can be smaller and lighter. Unfortunately, small cell sizes means more cells, so more expense to install, and more problems covering remote, low-population areas.
A cellular network is an expensive thing to build, and it costs well over £1,000,000,000 to get into this in a serious way. The four UK players in this game are all big, multi-national companies, who have big money to invest, or access to it from other sources.
Cell phones, also known as mobile phones or wireless phones, are hand-held phones with built-in antennas. Unlike home phones, cell phones can be carried from place to place with a minimum of fuss. This makes them a good choice for people who want to be in touch with other people even when they are away from the house.
How Do Cell Phones Work?
Not many people know it, but cell phones are actually two-way radios, much like the walkie-talkies of the past, albeit much more advanced. When you talk into your cell phone receiver, it registers your voice and converts the sound into radio waves. These waves travel through the air until they reach a receiver, which is usually found at a base station. This station will then send your call through a telephone network until it contacts the person you wish to speak with. Similarly, when someone places a call to your cell phone, the signal travels through the telephone network until it reaches a station near you. The station sends the radio waves out into the neighboring areas. These radio waves are then picked up by your cell phone and converted into the sound of a human voice.
Cell phones are a vast improvement over the telecommunications technology of the past, and are daily becoming a fixture of modern life. As always, communication is vital, and cell phones will help you to better communicate with the key people in your life. Using a cell phone is one of the first steps you must take to participate effectively in the emerging global economy.
There is nothing special about radio links - they've been used for scores of years. What is clever is that with a cellular system, each base station covers a limited area, and if a phone moves away, the connection is passed across to an adjacent base. This is called a hand-off, and allows mobility of phones, whilst permitting re-use of frequencies by base stations in nearby, but not adjacent, 'cells'.
The size of cells varies from system to system and place to place. They can be from over 50 miles across on the analogue 'TACS' systems from Vodafone and Cellnet, to less than 500 metres in busy areas on the 'GSM 1800' networks, One2one and Orange. The smaller the cell size, the more users that can be fitted onto the network, and the less power the mobile handset needs to reach the base, so it and its batteries can be smaller and lighter. Unfortunately, small cell sizes means more cells, so more expense to install, and more problems covering remote, low-population areas.
A cellular network is an expensive thing to build, and it costs well over £1,000,000,000 to get into this in a serious way. The four UK players in this game are all big, multi-national companies, who have big money to invest, or access to it from other sources.
Cell phones, also known as mobile phones or wireless phones, are hand-held phones with built-in antennas. Unlike home phones, cell phones can be carried from place to place with a minimum of fuss. This makes them a good choice for people who want to be in touch with other people even when they are away from the house.
How Do Cell Phones Work?
Not many people know it, but cell phones are actually two-way radios, much like the walkie-talkies of the past, albeit much more advanced. When you talk into your cell phone receiver, it registers your voice and converts the sound into radio waves. These waves travel through the air until they reach a receiver, which is usually found at a base station. This station will then send your call through a telephone network until it contacts the person you wish to speak with. Similarly, when someone places a call to your cell phone, the signal travels through the telephone network until it reaches a station near you. The station sends the radio waves out into the neighboring areas. These radio waves are then picked up by your cell phone and converted into the sound of a human voice.
Cell phones are a vast improvement over the telecommunications technology of the past, and are daily becoming a fixture of modern life. As always, communication is vital, and cell phones will help you to better communicate with the key people in your life. Using a cell phone is one of the first steps you must take to participate effectively in the emerging global economy.
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