Surely we will have wondered about the process when receiving or issuing a call with the phone and that there are places where we have no signal, try to briefly explain each of these questions.
To begin with the sounds and data are converted into electromagnetic signals that can travel through the air and received by base stations called masts or satellite some special cases.
So when we call on our cell phone begins to emit radio waves that are intercepted by the nearest base station.
Base stations are a key agency for making and receiving calls as well as for sending data or surfing the Internet, to achieve broad coverage of these stations are located strategically called "cells" of this term derives from the word cell.
To begin with the sounds and data are converted into electromagnetic signals that can travel through the air and received by base stations called masts or satellite some special cases.
So when we call on our cell phone begins to emit radio waves that are intercepted by the nearest base station.
Base stations are a key agency for making and receiving calls as well as for sending data or surfing the Internet, to achieve broad coverage of these stations are located strategically called "cells" of this term derives from the word cell.
extraido de universocelular.com
How does the cell phone?
Cell phones, for they are and look sophisticated, they are still personal radio transmitters.
Being a telephone system completely wireless, sounds are converted into electromagnetic signals, which travel through the air, being received and converted back into a message via antennas or satellite relay.
To better understand how these sophisticated devices can help compare a shortwave radio (OC) or a walkie-talkie. A CB radio is a simple device. This allows two people to communicate using the same frequency, so only one person can talk at once. A cell phone is a dual device, this means that uses one frequency for talking and a second separate frequency for listening. CB radio has 40 channels. A cell phone can use 1664 channels. These phones also operate in "cells" (or "cells") and can switch the cell used as the phone is moved. Cell phones give a much wider range of devices compared. A walkie-talkie can transmit up to perhaps a mile. A CB radio, because it has a much higher power, can transmit up to 5 miles. Someone who uses a cell phone, you can drive through the city and keep the conversation going all the time. Cells are giving cell phones a wide range.
Cell phones, for they are and look sophisticated, they are still personal radio transmitters.
Being a telephone system completely wireless, sounds are converted into electromagnetic signals, which travel through the air, being received and converted back into a message via antennas or satellite relay.
To better understand how these sophisticated devices can help compare a shortwave radio (OC) or a walkie-talkie. A CB radio is a simple device. This allows two people to communicate using the same frequency, so only one person can talk at once. A cell phone is a dual device, this means that uses one frequency for talking and a second separate frequency for listening. CB radio has 40 channels. A cell phone can use 1664 channels. These phones also operate in "cells" (or "cells") and can switch the cell used as the phone is moved. Cell phones give a much wider range of devices compared. A walkie-talkie can transmit up to perhaps a mile. A CB radio, because it has a much higher power, can transmit up to 5 miles. Someone who uses a cell phone, you can drive through the city and keep the conversation going all the time. Cells are giving cell phones a wide range.
extraido de almadark.com
How does a cell phone
Cell phones, operating on radio frequency, innovated to minimize the availability of RF spectrum. Now, several cell phone towers antennas are used to cover a large geographic area. Each tower (base station) covers a circular area called cell. A large geographical region is divided into a number of cells, allowing different base stations use the same channels / frequencies for communication.
Another important aspect of this division in cells is that cell phones need less power to transmit and reach any base station that covers a smaller area. Reducing the energy required for transmission, reducing the battery size and thus weight. This contributes to the reduction in size of cell phones would not be possible without the cellular technology.
When you use your cell phone, first phone locates the base station with the strongest signal and requests a channel. The base station accesses the channel and the call is then accepted. The call is then sent to local telephone network if the call is for a regular phone, otherwise it will be transmitted by the mobile network.
When the phone is connected, the SID (System Identification Code) on the control channel is equivalent to the SID of the phone. If the SID is identified, understood that the cell phone is communicating with the local system. The phone sends a registration request, along with the SID and the MTSO keeps the course of the phone's location in the database. If the control does not identify the SID of your phone, then the phone is roaming.
Cell phones, operating on radio frequency, innovated to minimize the availability of RF spectrum. Now, several cell phone towers antennas are used to cover a large geographic area. Each tower (base station) covers a circular area called cell. A large geographical region is divided into a number of cells, allowing different base stations use the same channels / frequencies for communication.
Another important aspect of this division in cells is that cell phones need less power to transmit and reach any base station that covers a smaller area. Reducing the energy required for transmission, reducing the battery size and thus weight. This contributes to the reduction in size of cell phones would not be possible without the cellular technology.
When you use your cell phone, first phone locates the base station with the strongest signal and requests a channel. The base station accesses the channel and the call is then accepted. The call is then sent to local telephone network if the call is for a regular phone, otherwise it will be transmitted by the mobile network.
When the phone is connected, the SID (System Identification Code) on the control channel is equivalent to the SID of the phone. If the SID is identified, understood that the cell phone is communicating with the local system. The phone sends a registration request, along with the SID and the MTSO keeps the course of the phone's location in the database. If the control does not identify the SID of your phone, then the phone is roaming.
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