Cellphones Essay

1370 Words Oct 22nd, 2012 6 Pages
Cell phones

Freymel De La Rosa
Mr. Ramírez
English 11, 3rd period
May 29th 2012

Outline
Thesis Statement: Cell phones have changed us socially in many ways since their first invention till now, through their history, uses, and their changes in communication.
Introduction
I. Cell phones History A. First cell phones B. Cell phones inventor C. How they work II. Using of Cell Phones A. Changes in Communication B. Benefits C. Health effects III. Have they changed us socially? A. How? B. Negative use C. Positive use

De La Rosa 1
The concept of the cellular phone was developed in 1947 which originated from the mobile car phone. The concept of the cellular phone was produced by Bell
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Mikulski, John F. Mitchell, Roy A. Richardson, and John H. Sangster. When the cell phone is activated it searches for a System Identification Code (SID) on a control channel. A SID is a different 5 digit number that is assigned. The control channel is responsible for allowing the phone and base station to communicate

De La Rosa 2 about call set–up and channel changing. If a control channel can not be found then the phone is out of range and has “no service”. When the cell phone gets the SID, it is compared to the SID that has already been set in the phone and if they match then this means two cell phones of the same home system have been connected. Also, the cell phone gives off a registration request. The MTSO keeps a record of the phone’s location in order to know what cell it is in when in needs to ring. Once the phone rings and the cell has been determined, the MTSO chooses a frequency pair that the phone uses to take the call. Over the control channel the MTSO communicates with the cell phone to determine which frequencies to use. Then the cell phone and the tower switch with those frequencies and the call is connected. If the cell phone reaches the end of the cell the strength of the signal diminishes so the MTSO allows the 2 base stations to connect and get on a control channel to decide which frequency to switch to.
Cell phones have vastly changed the way we communicate today. A cell phone can be all you need for communicating. From a cell