4 Clarifications On The Cell Phone
A cell phone, short for cell phone or cell, phone, sometimes shortened to just cell, mobile phone or hand phone, can simply make and receive telephone calls via a radio signal while the user is traveling within a telephone network. Cell phones are regulated by the FCC (Federal Communication Commission) which sets rules and guidelines for how a mobile device may be used. The FCC also licenses the use of certain frequencies in order to provide access to the service and charges a fee for its use. There are no public or private lines that carry the signals and the transmissions must be done through the air, so the use of a cell phone in this way is considered to be done through wireless means.
A cell will support the use of a fixed number of analog channels. These channels are available to both the owner of the cell phone and any other devices that may want to connect to it. Generally, the larger the cell phone the fewer the analog channels it has available and usually these are in the center ring range. In most cases (unless the cell phone is an analog system) each call comes to the caller with the specific analog channel assigned. This makes the use of the Internet or a computer extremely easy since there are no long distance charges involved.
Most cell phones are preinstalled with at least one, but sometimes more, of what is known as multi-line roaming. This allows you to place calls anywhere in the country where your primary line is located. You can do this regardless of whether the person on the other end is using the same plan or not. It is referred to as Cooper said roaming, because the cell phones used to make the calls are equipped with the necessary signals to make cooperative calls, but the Cooper said line is not attached to the one being called.
Digital telephones work on frequencies that are different from those used for voice and data communications. These frequencies are much higher than the ones used for voice and it takes the edge off of these frequencies. Digital information is carried over these lower frequencies and the actual data or voice is converted into digital information before being sent.
The next step up from the basic analog system is the digital system. Digital information is much higher than the analog system and it is encoded into the cell phone so that when it goes over certain frequencies it receives a digital signal instead of an analog signal. This allows the cell phone to actually listen in on conversations that are taking place without having to translate the conversation for it to understand it. The downside to this is that there is an increased chance that the cell phone itself will be broken if the signal becomes too weak. There is also an issue with the quality of the sound produced by the digital information and it is much less reliable than the sound quality of the voice channels available on the basic analog system. Digital information is available in the lower to mid range band frequencies which allow the voice channels available to be much better.
The cell-phone manufacturers have recognized the need for a higher bandwidth as well. As the use of the Internet grows, the need for even higher frequencies is necessary in order to remain competitive in the marketplace. Many of the new cell phones being sold today actually offer some form of voice channels available in the higher band frequency ranges. These voice channels are typically much more reliable and it easier to understand what is going on in conversations when the cell-phone is using these higher voice frequencies. These voice channels can come in handy for people who have Internet connections but who are limited in the locations where they can carry their cell-phone.
The three major technological players in the cell phones industry today are the RCC (Real-Time Communication), the GSM (Global Standard Model) and the CDMA (idium) systems. RCC base stations use a single radio that can detect and receive cell phones in the base stations' channels. GSM base stations and CDMA base stations use separate channels for the voice and data communications, respectively.
For those who are interested in cell phones but are unfamiliar with their technological workings, there are books available to help out. Some of the more technical terms used by consumers are what is known as the IMT (International Mobile Telephony), the RF (Radio Frequency Identification) and the GPRS (General Packet Radio Service). In addition to that, there are also several other terms and jargon used by the customer service experts that are not so easily explained.
Post a Comment for "4 Clarifications On The Cell Phone"