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Network Devices

Network Devices. Sritrusta Sukaridhoto. Network Devices. Media on PC. Ethernet Modem PC Card (WLAN) DVB. Ethernet - Architecture. Ethernet – IEEE 802.3. 10Base5 – Thick wire coaxial 10Base2 – thin wire coaxial / cheaper net 10BaseT – Twisted Pair 10BaseF – Fiber Optics

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Network Devices

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  1. Network Devices Sritrusta Sukaridhoto

  2. Network Devices

  3. Media on PC • Ethernet • Modem • PC Card (WLAN) • DVB

  4. Ethernet - Architecture

  5. Ethernet – IEEE 802.3 • 10Base5 – Thick wire coaxial • 10Base2 – thin wire coaxial / cheaper net • 10BaseT – Twisted Pair • 10BaseF – Fiber Optics 100BaseT – Fast Ethernet

  6. Ethernet – 10Base5

  7. Ethernet – 10Base2

  8. Ethernet – 10BaseT

  9. NIC Connector type • Coaxial Cable • Bayonet Nut Connector (BNC) • Twisted Pair Cable • RJ-45 (8 wire) • Fiber Optics • SMA connectors

  10. Modem • Allows modems of different vendors to operate together • Define How modems operate: • Modulation techniques • Data compression technique • Error detection strategy

  11. Modem – Analog vs Digital • Analog • Infinite number of levels • Conform to voice pattern • Times from highest to lowest and back to the highest point in one second is the frequency • Can be transmitted over long distance • Digital • Only two levels (high and low) • Conforms to how computers operate • Cannot transmitted over long distance

  12. Modem - Connection

  13. Modem – Internal/External

  14. PC Card – WLAN (802.11) • Bypassing last mile

  15. PC Card (WLAN) - 1

  16. PC Card (WLAN) - 2

  17. PC Card (WLAN) – Indoor Antena

  18. DVB – DVB/IP Tech • The Digital Video Broadcast over Internet Protocol (DVB/IP) system is functionally an IP-over-Ethernet simplex satellite service that incorporates frame-relay type traffic management. At its core, DVB is a modem-on-a-chip, plus an intelligent multiplexer. The antenna is typically a CATV dish, 2.4 - 3.8 meters in diameter (for C-band), or 0.6 -1.8 meters (for Ku-band).

  19. DVB – DVB/IP Routing

  20. DVB - Adaptability

  21. DVB – DVB Card

  22. Media • Wired • Twisted Pair – UTP • Coaxial • Fiber • Wireless • Microwave • Satellite

  23. Twisted Pair • Two wired wrapped in a twisted fashion • Designed to reduce cross-talk due inductance • Still subject to interference from stray signal • Primarily used for local loop connections and LANs • Comparatively narrow bandwidth

  24. UTP – Unshielded Twisted Pair • Pair 1 • White/blue • Blue • Pair 2 • White/Orange • Orange • Pair 3 • White/Green • Green • Pair 4 • White/Brown • Brown • RJ45 Connector

  25. UTP – Straight Cable Wo/O Wg/B Wb/G Wbr/Br

  26. UTP – Cross Cable Wg/G Wo/B Wb/O Wbr/Br

  27. UTP - Category

  28. Coaxial • Center lead conducts the signal • Protected by insulation and braded wire • Used mostly for television and connections to antenna • Larger Bandwidth but large in size

  29. Fiber Optical • Signal transmitted by photos rather than electrons • Dramatically higher bandwidth • Used mostly for backbone communication connections, very high speed LANs and fast network connections

  30. Microwave – Antenna (1) • Omni • 2.4GHz 8dBi

  31. Microwave – Antenna (2) • Sectoral • 14dBi 180deg

  32. Microwave – Antenna (3) • Sectoral • 17dBi 90deg

  33. Microwave – Antenna (4) • Direct (Grid) • 2.4 GHz 24dB

  34. Microwave – Power AMP

  35. Satellite - Broadband

  36. Media Comparison

  37. Multiplexer • HUB • Switch • Bridge • Router

  38. Hub versus Switch • Hub provide connection to all ports (i.e. in one port and out all other ports). • Passive hub – no signal regeneration • Active hub – provide signal regeneration • Switch direct the message from appropriate port (directs a message from the input port to the desired output port). • More expensive but better bandwidth utilization

  39. Hub versus Switch

  40. LAN Hub device

  41. Hub

  42. LAN Switch device

  43. Switch

  44. Bridge – Access Point (WLAN)

  45. Router • Connecting different segment • Have different interfaces (Ethernet, WAN-Serial, Fiber, etc) • Table Routing

  46. Router

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