Basic Slide show that presents information on how cell phones work

1. Cell Phone Technology By Alex Mitchell

2. What Was The First Primitive Cell Phone? The First Mobile Communication Device was Called a Radio Phone It worked by connecting to a tower that could be up to 50 miles away. These Phones Required a strong transmitter installed in a car. These towers also only supported a few callers at the same time

3. How do Cell Phones Work Today? 1.Use towers that are usually no more then 8 miles away 2.Each area the tower serves is considered a cell 3.Each cell uses different frequencies 4.Most Cities Have Many Cells

4. How Does It Make a Call? 1.It uses two channels to make a call. 2.One Channel is your voice 3.The Second Channel is the recipient’s voice

5. Older Phones use analog technology Analog technology takes up more bandwidth than digital 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. Analog V.S. Digital

6. Special Codes are used to identify the user and the account. Electronic Serial Number (ESN) - a unique 32-bit number programmed into the phone when it is manufactured. Mobile Identification Number (MIN) - a 10-digit number derived from your phone's number. How Does My Phone Company know Who I Am? System Identification Code (SID) - a unique 5-digit number that is assigned to each carrier by .the FCC

7. How Does a Text Message Work? An SMS Message is limited to 160 characters Once the send button is selected itwill connect to a SMS gateway After it connects to the SMS Gateway it sends the packet of information The phone will wait for a confirmation the message was received and will display “message sent”.

8. Advanced Text Messages 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. New Technologies like MMS(Multimedia Messaging Service) fixes that. When an mms message is received, it contains a link to the attachment where the multimedia files can be downloaded

9. Current Breakthroughs The Newest Phone Technology includes built-in MP3 Player, Camera, and PDA capabilities With larger files came the need for faster speed The Newest technology called 3G or third generation can transfer data at speed up to 3Mbps Compared to 2G technology at 114kbps it is like Broadband V.S. Dial-up

10. In Review Cell Phones Connect to towers inside Cells Text Messages are sent through a SMS center MMS Provides the ability to send photos, video, and sounds New 3G networks provide faster downloads