How Cell Phones Work


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How Cell Phones Work

  1. 1. Cell Phone Technology<br />By Alex Mitchell<br />
  2. 2. What Was The First Primitive Cell Phone?<br />The First Mobile Communication Device was <br />Called a Radio Phone<br />It worked by connecting to a tower that could be up to 50 miles away.<br />These Phones Required a strong transmitter installed in a car.<br />These towers also only supported a few callers at the same time<br />
  3. 3. How do Cell Phones Work Today?<br />1.Use towers that are usually no more then 8 miles away<br />2.Each area the tower serves is considered a cell<br />3.Each cell uses different frequencies<br />4.Most Cities Have Many Cells<br />
  4. 4. How Does It Make a Call?<br />1.It uses two channels to make a call.<br />2.One Channel is your voice<br />3.The Second Channel is the recipient’s voice<br />
  5. 5. Older Phones use analog technology<br />Analog technology takes up more bandwidth than digital<br />Newer Phones Compress Voice into a series of 0’s and 1’sThis compression of information allows more users to connect to a tower at once.<br />Analog V.S. Digital<br />
  6. 6. Special Codes are used to identify the user and the account.<br />Electronic Serial Number (ESN) - a unique 32-bit number programmed into the phone when it is manufactured. <br />Mobile Identification Number (MIN) - a 10-digit number derived from your phone&apos;s number.<br />How Does My Phone Company know Who I Am?<br />System Identification Code (SID) - a unique 5-digit number that is assigned to each carrier by .the FCC<br />
  7. 7. How Does a Text Message Work?<br />An SMS Message is limited to 160 characters <br />Once the send button is selected itwill connect to a SMS gateway<br />After it connects to the SMS Gateway it sends the packet of information<br />The phone will wait for a confirmation the message was received and will display “message sent”.<br />
  8. 8. Advanced Text Messages<br />Some messages contain video, audio ,and images that can be sent through a text messageSince a Text Message is limited to 160 Characters it cannot contain large files.<br />New Technologies like MMS(Multimedia Messaging Service) fixes that.<br />When an mms message is received, it contains a link to the attachment where the multimedia files can be downloaded <br />
  9. 9. Current Breakthroughs<br />The Newest Phone Technology includes built-in MP3 Player, Camera, and PDA capabilities<br />With larger files came the need for faster speed<br />The Newest technology called 3G or third generation can transfer data at speed up to 3Mbps<br />Compared to 2G technology at 114kbps it is like Broadband V.S. Dial-up<br />
  10. 10. In Review<br />Cell Phones Connect to towers inside Cells<br />Text Messages are sent through a SMS center<br />MMS Provides the ability to send photos, video, and sounds<br />New 3G networks provide faster downloads<br />