7 - Computer Networks

7 - Computer Networks - Session 7 - Computer Networks...

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Session 7 - Computer Networks Telecommunication services are divided into 3 categories: Voice telecommunication – using electrical signals to transmit human voice across a dist Video telecommunication – electrically-based transmsn of moving pics and sound across a dist Data telecommunication – using electrical signals to exchange encoded data btwn computing devices across a dist 7.1 Defining Networks Network: Any interconnected group or system Elements of Communications: Sender, Transmitter, Channel, Medium, Receiver, Destination Mobile phone Sender: You Msg: want to go out? Channel: 1.2 GHz Medium: Microwave radio Receiver: Friend’s phone Destination: Friend Source - the originator of the msg, whether it is a person or machine. Transmitter - the eqmt tt modifies the msg (either data or voice) into the form rqd for transmission Channel - the means of carrying the signal from the source to the destinatn Transmissn media - phy (copper wire/fiber optic) or atmospheric (radio waves) Receiver - device tt captures the msg from the channel and converts it into a form tt the person or machine at the destination can understand Destination - the person or machine to whom the msg is directed 7.2 Classifying Networks (My Stupid Toad Ran To Africa To Dive The Pond) 1. Media 6. Access Privilege 2. Signal Type 7. Transmission Direction 3. Transmission Rate 8. Distribution of Tasks and Computing Power 4. Range 9. Transmission Method 5. Topology 10. Protocol
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1. Transmission Direction Simplex - msgs flow in only one direction, from source to destination Half-duplex communication – msgs travel in both directions btwn source and the destination, but in only one direction at a time Full-duplex communication - msgs can travel in both directions simultaneously One-to-one communication - a single source sends info to a single destination. One-to-many communication - a single source simultaneously sends info to multiple destinatns Many-to-many communication - many sources issue msgs to many destinations
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2. Signal Signals - mtd for representing info to convey from one entity to another - Signals used in telecomm are electrical impulses (electric current manipulated to convey info) - Carries content of msg, source and destination, order and length, signal’s route etc Analog Signal Electromagnetic signals tt vary in their strength and spd Consists of amplitude, freq and wavelength Analog transmission used in tel, fax machines, modems, radio and TV broadcasts, wireless netwks Dig Signal Composed of individual pulses of voltage
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This note was uploaded on 03/21/2010 for the course IT AB113 taught by Professor Tan during the Spring '10 term at Nanzan.

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7 - Computer Networks - Session 7 - Computer Networks...

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