ECE/IUPUI Intro to Computer Communication Networks 1 Session 1. Introduction to Communication Networks ECE/IUPUI Intro to Computer Communication Networks 2 Network Services The Traditional Networks n Postal mail n Water supply networks n Electricity power networks n Transportation networks n Cable and television broadcast networks n Telephone Communication networks – microwave, electronic and optical n Wireless communication (cellular, satellite, … ) n Public networks (telephone, Internet, … ) n Private networks (bank, military, airlines, … )
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Session 1. Introduction to Communication Networksdskim/Classes/ECE463/ln-network-ch01.pdfIntro to Computer Communication Networks 5 Telephone Service-2 Caller Telecom Networks Central
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ECE/IUPUIIntro to Computer Communication
Networks 1
Session 1. Introduction to Communication Networks
ECE/IUPUIIntro to Computer Communication
Networks 2
Network Services
The Traditional Networksn Postal mailn Water supply networksn Electricity power networksn Transportation networksn Cable and television broadcast networksn Telephone
Communication networks – microwave, electronic and opticaln Wireless communication (cellular, satellite, … )n Public networks (telephone, Internet, … )n Private networks (bank, military, airlines, … )
ECE/IUPUIIntro to Computer Communication
Networks 3
Radio and Television Broadcasting
Multiple recipientsPassiven All user receives identical contentsn No user sends a message
High quality requiredTolerable delayn Several secondsn Not tolerable a variation of delay, though
ECE/IUPUIIntro to Computer Communication
Networks 4
Telephone service-1
Real-time servicen A few hundred mili-seconds delay
Peer-to-peer communicationReliablen No automatic re-transmission
Connection-orientedn First,established a connection
ECE/IUPUIIntro to Computer Communication
Networks 5
Telephone Service-2
Caller
TelecomNetworks
Central OfficeCallee
Central Office
Access Networks Access Networks
Connection established forbidirectional conversation
pickup
dial tone
dial the numberroute
ringring
ring
callee pick up the phone
hang-up
terminating signals
ECE/IUPUIIntro to Computer Communication
Networks 6
Cellular Telephone Service
Mobilityn Shared mediumw Radio Transmission
n Hand-offw Able to keep conversation when moving an area to
another
n Roamingw Able to carry a hand-set out of home base
Radio transmissionn Low quality, low availability, and a security hole.
ECE/IUPUIIntro to Computer Communication
Networks 7
Electronic mail
Not a real-time at alln Tolerable to large delays: possibly several days
Forward a whole message at a timeNo need of connection-oriented
ECE/IUPUIIntro to Computer Communication
Networks 8
World Wide Web
Client-server modelRemote document retrievaln Text filen Binary file - audio, image and application filen Link – specified with URL
Interactive but not a real-timeHyperText Transfer Protocol (HTTP)
ECE/IUPUIIntro to Computer Communication
Networks 9
Video-on-demand (VOD)
Integration of video rental store and video playerInteractiven STOP, PLAY, FF, REW, PAUSE
No need of real-timeBillingCopyright protect
ECE/IUPUIIntro to Computer Communication
Networks 10
What is a protocol?A set of rules governing how two parties are to interact.
Postal Mail Protocoln Sender’s address at the left -upper cornern Recipient ’s address at the centern Stamps at the right -upper corner
Walkie-Talkie Protocoln Listenn Hear “Over!” or nothing
w Say a sentence and “Over!”while holding down the buttonw Release the button
Protocols in communication networksn HTTP, FTP, TCP, IP, Ethernet, CDMA, ATM, SONET, PPP, ICMP,