Landline communication system Overview Introduction n Landline communication

Landline communication system

Overview Introduction n Landline communication system. n Examples. n

Introduction: Types of communication systems: 12 - Landline communication system • Cellular and mobile communication • system.

Types of communication systems: Cellular and mobile communication system Landline communication system Telephone DSL Mobile phone network

What is a Landline? n n n A landline is a physical connection between two devices. Example on a Landline: Landline Phone (metal wire or fiber cable)

Telephone History How Does it Work ?

History Of Telephone Alexander Graham inventing the first practical telephone. Thomas Edison, invented the carbon microphone which produced a strong telephone signal

Bell on the telephone in New York (calling Chicago) in 1892

How Telephone Works ?

DSL -What is it ? - How does it work ? - What are the advantages and disadvantages ?

What is DSL ? n n n DSL stands for Digital Subscriber Line. It is a technology that brings huge data and information to homes and small businesses over ordinary telephone lines. Different variations of DSL, such as ADSL, HDSL, IDSL, VDSL and RADSL.

How does it work ? I- Overview • II- Process •

OVERVIEW n How is it connected ? Speed Range. (from 144 Kb to 1. 5 Mb per second) n

Process

Advantages • DSL does not tie up the phone line. • Higher speed. • DSL doesn't necessarily require new wiring. • Some companies that offers DSL will usually provide the modem as part of the installation.

Disadvantages - The farther you are from the central office, the slower your connection is. As you move away from the central office, more distortion enters the line and the signal deteriorates. - The connection is faster for receiving data than it is for sending data over the Internet. - The service is not available everywhere.

Dial-up and DSL signals n Using Dial-up for internet. n Interfere with phone calls. Why ? n Slow. Why?

Dial-up n Originally designed to carry “Speech”. n 300 Hz to 3. 4 k. Hz n In one wire: n Phone call data + Internet data = ? NOISE

DSL n n n Originally designed to carry “Data”. 25 k. Hz to 1. 1 MHz. In one wire: n Phone call data + Internet data = ? BUT IN DIFFERENT FREQUENCIES

The Splitter

The Splitter n One input and two outs device: n n n Phone output get. DSL output get. Phone output gat is a Low-pass filter: n It passes DC to 3. 4 k. Hz.

The Splitter

EE 205 Term Project Supervision of : Workers on the project: DR. SAMIR AL-GHADHBAN - BASEM ALSHAHRANI - SAUD KHAIR - ABDULAZIZ ALSENAIDE

References n n n n http: //en. wikipedia. org/wiki/History_of_the_telephone https: //www. youtube. com/watch? v=Koylq 78 Lzo. M http: //www. epanorama. net/documents/telecom/adsl_filter. html http: //www. wisegeek. com http: //www. netstartechnology. net/ http: //computer. howstuffworks. com http: //www. dslreports. com/faq/117 http: //www. pcworld. com/article/14129/article. html