1. Computer Network 1Lecture 11 Pengantar Jaringan Komputer Iwan Syarif Hero Yudo Martono

2. Computer Network 1Lecture 12 Apa itu Jaringan Kumpulan dua atau lebih dari komputer yang saling berhubungan satu sama lain

3. Computer Network 1Lecture 13 Kegunaan Jaringan Sharing resource (data, printer, dll) Efisiensi waktu Efisiensi tempat Effisiensi dana

4. Computer Network 1Lecture 14 Kerugian Jaringan Membutuhkan biaya tambahan Memungkinkan adanya serangan ke komputer kita Mengurangi human communication

5. Computer Network 1Lecture 15 Types of Computer Networks Local Area Networks (LANs) within a building or campus usually based on broadcast channels often connected via gateways to wide area networks Examples: (Fast)Ethernet, FDDI rings, Myrinet, ATM LANs Bit rates: 10-1000 Mbps Cable Computer (b) (a) Computer

6. Computer Network 1Lecture 16 Type of Computer Networks Metropolitan Area Networks (MANs) covers area of a city usually based on LAN technology Examples: DQDB (Distributed Queue Dual Bus), cable television networks

7. Computer Network 1Lecture 17 Type of Computer Networks Wide Area (Long Haul) Networks may cover country, continent Most communication links are point-to-point usually irregular topology usually organized as a “ subnet ” to which hosts have access. switching elements are generically referred to as routers

8. Computer Network 1Lecture 18 Wireless Networks Wireless: Cordless telephones, TV remote control, Analog cellular telephones Wireless LANs Mobile vs. wireless mobile, not wireless mobile, wireless not mobile, not wireless not mobile, wireless

9. Computer Network 1Lecture 19 Internetworking Many (mutually incompatible) network technologies No one technology appropriate for every situation Internetworking glues together networks of dissimilar technologies with routers Result is virtual network whose details are invisible

10. Computer Network 1Lecture 110 Internetworking (example) Different network technologies can be connected to create an internetwork

11. Computer Network 1Lecture 111 Peralatan Jaringan Sederhana PC (komputer) LAN card Kabel UTP RJ 45 Tang Crimping Multimeter Hub Switch

12. Computer Network 1Lecture 112 LAN card

13. Computer Network 1Lecture 113 Pasang LAN card ke PC

14. Computer Network 1Lecture 114 What ’ s a protocol? a human protocol and a computer network protocol: Q: Other human protocol? Hi Got the time? 2:00 TCP connection req. TCP connection reply. Get http://gaia.cs.umass.edu/index.htm time

15. Computer Network 1Lecture 115 Transmission media Transmitted energy is carried through some sort of medium Transmitter encodes data as energy and transmits energy through medium Requires special hardware for data encoding Requires hardware connection to transmission medium Media can be copper, glass, air,...

16. Computer Network 1Lecture 116 Copper wires Twisted pair uses two wires Coaxial cable includes shield for improved performance

17. Computer Network 1Lecture 117 Kabel UTP

18. Computer Network 1Lecture 118 Glass fibers Thin glass fiber carries light with encoded data Plastic jacket allows fiber to bend (some!) without breaking Fiber is very clear and designed to reflect light internally for efficient transmission Light emitting diode (LED) or laser injects light into fiber Light sensitive receiver at other end translates light back into data

19. Computer Network 1Lecture 119 Radio Data transmitted using radio waves Energy travels through the air rather than copper or glass Conceptually similar to radio, TV, cellular phones Can travel through walls and through an entire building Can be long distance or short distance Long distance with satellite relay Short distance - wireless computer network

20. Computer Network 1Lecture 120 Wireless Example Wireless bridge and antenna Base-station antenna for a wireless radio- frequency network; this antenna is attached to a unit that also connects to a wire-based network and forwards data between the wireless and wire-based networks

21. Computer Network 1Lecture 121 Wireless Example Remote station (laptop) interface

22. Computer Network 1Lecture 122 Microwave High frequency radio waves Unidirectional, for point-to-point communication Antennas mounted on towers relay transmitted data

23. Computer Network 1Lecture 123 Infrared Infrared light transmits data through the air Similar to technology used in TV remote control Can propagate throughout a room (bouncing off surfaces), but will not penetrate walls Becoming common in personal digital assistants

24. Computer Network 1Lecture 124 Laser Unidirectional, like microwave Higher speed than microwave Uses laser transmitter and photo- sensitive receiver at each end Point-to-point, typically between buildings Can be adversely affected by weather

25. Computer Network 1Lecture 125 RS-232 wiring and connectors

26. Computer Network 1Lecture 126 Modems If external to computer, RS-232 can be used between modem and computer

27. Computer Network 1Lecture 127 Modems If external to computer, RS-232 can be used between modem and computer

28. Computer Network 1Lecture 128 Modems If internal, direct bus connection used Can also be rack-mounted Modems in a computer center for dial-up modem access to the organization network

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58. Computer Network 1Lecture 158 What's next? --Data Transmission Two issues-- MEDIUM FORM OF ENERGY copper -- electrical current fiber optics (glass) -- light air -- electromagnetic radio waves combination of copper and fiber -- both energy forms （ cable modem technology)