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Pengantar Teknologi Informasi

Pengantar Teknologi Informasi. 7.1. Layer Fisik. Fakultas Ekonomi UNPAR. Sebelumnya. Standard Protocol Layer. Layer Fisik. Sinyal digital dan analog Contoh alat: modem Media transmisi. 1. Layer Fisik: sinyal. Masalah pe-sinyal-an: Sinyal digital Sinyal analog. VOLTAGE LEVEL.

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Pengantar Teknologi Informasi

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  1. Pengantar Teknologi Informasi 7.1. Layer Fisik Fakultas Ekonomi UNPAR

  2. Sebelumnya • Standard • Protocol • Layer

  3. Layer Fisik • Sinyal digital dan analog • Contoh alat: modem • Media transmisi

  4. 1. Layer Fisik: sinyal • Masalah pe-sinyal-an: • Sinyal digital • Sinyal analog VOLTAGE LEVEL 1 CLOCK CYCLE

  5. 1. Layer Fisik • Masalah pe-sinyal-an: • Komputer memahami digital (biner) • Media ‘hanya’ menghantarkan sinyal analog Sistem Perteleponan Modem Modem Komputer B Komputer A Sinyal digital Sinyal digital Sinyal analog Sinyal analog

  6. 1. Modulasi • Sinyal dikirimkan dalam perubahan modus • Jenis modulasi: • AM : amplitude • FM : frequency • PM : phase • CM : complex Carrier AM FM PM

  7. 1. Modem • Modulator: ubah sinyal digital ke analog • Demodulator: ubah sinyal analog ke digital • (biasa) digunakan menghubungkan komputer melalui line telepon (analog) • Modem komputer PC

  8. 1. Modem • Modem: • Modulator - Demodulator • Modem komputer PC: • External • Internal • PCMCIA • Port: serial / com, usb, … • Standard: ITU-T

  9. 1. Komunikasi • Komunikasi: mengirim data dari sumber ke tujuan. • Transmiter: alat untuk mengirim • Receiver: alat untuk menerima

  10. 1. Arah Transmisi • Simplex • Contoh: siaran radio • Duplex: • Half duplex • Full duplex simplex

  11. 2. Media Transmisi • Jenis media • Kabel, wire, guided • Nirkabel, wireless, unguided • Karakteristik • Topologi • Jarak

  12. Kabel • Twisted Pair • Shielded twisted pair (stp) • Unshielded twisted pair (utp) • Coaxial cable • Optical fiber

  13. Hubungan 2 komputer • Hubungkan 2 komputer: • serial-to-serial: terminal, null modem • network card, UTP cable • Network card, coaxial cable Berbeda: hubungan komputer dengan external device (printer, keyboard, …)

  14. Hubungan 2 komputer • Hubungkan 2 komputer melalui PSTN

  15. Hubungan 2 komputer • Hubungkan komputer ke ISP

  16. UTP, banyak komputer • 1 hub: beberapa komputer • jumlah port di hub

  17. Jaringan UTP • Hubungan antar hub

  18. Twisted Pair • Jenis: • STP • UTP • Speed autosensing 4 pairs (8 lembar) No metal shielding RJ-45 Jack RJ-45 Connector

  19. UTP

  20. Coaxial • cabel TV (CATV) • LAN

  21. Fiber Optic • Serat lensa

  22. Wireless • Radio modem • waveLAN • Access Point • WiFi • VSAT • PAN: bluetooth, IrDA

  23. Service band • service band = pita layanan • Setiap service band dibagi dalam beberapa chanel • Bandwidth: lebar pita • Makin lebar pita, makin cepat sinyal • Broadband: wide bandwidth • Narowband: small bandwidth Frequency Spectrum (0 Hz to infinity) Channel 5 Channel 4 Service Band Channel 3 Channel 2 Channel 1 0 Hz

  24. Radio Modem • Frekuensi radio: 30 – 300 MHz • Max data rate: 100 Kbps • Jarak tergantung amplifier • Radio amatir

  25. waveLAN • Standard: 802.11 • Unlicensed frequency: 2,4 GHz dan 5,8 GHz • industrial, scientific and medical devices (ISM) • Hubungan antar gedung, maks: 5 km; amplifier->60km • Digunakan oleh: warnet, sekolah, isp • Wired Equivalent Privacy (WEP)

  26. Access Point • Penghubung dari wireless ke LAN

  27. WiFi • Wireless Local Area Network based on IEEE 802.11 specification • 802.11b: 11 mbps; 2.4 GHz • 802.11g: 50 mbps ; 2.4 GHz • 802.11a: 50 mbps; 5 GHz • connecting mobile data devices and Wi-Fi access points to wired network • Wireless Protected Access • hotspot

  28. Bluetooth • connectingbetween mobile data devices • PAN: personal area network • Frekuensi: 2.4 GHz

  29. IrDA • Infrared Data Association

  30. Satellite Geosynchronous Satellite Point-to-Point Uplink Broadcast Downlink Earth Station A Earth Station B

  31. Topology • Star • Bus • Ring

  32. Jarak • LAN: jarak dekat, area terbatas • WAN: jarak jauh, melalui area publik

  33. Tugas • Berikan sebuah contoh manfaat (tujuan) bagi end-user menghubungkan 2 komputer. • Untuk tujuan tadi, maka tentukan: • Media transmisi (yang dilalui) • Perangkat yang diperlukan • Jenis topologi dan • Jenis jaringan berdasarkan jarak

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