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Lecture 20

Lecture 20. Network Media. Media refers to the means used to link a network's nodes together communications channel is the transmission media on which data, instructions, or information travel in a communications system. Choice impacts Speed Security Size. Wireless Media.

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Lecture 20

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  1. Lecture 20

  2. Network Media • Media refers to the means used to link a network's nodes together • communications channel is the transmission media on which data, instructions, or information travel in a communications system. • Choice impacts • Speed • Security • Size

  3. Wireless Media • Data transmitted through the air • LANs use radio waves • WANs use microwave signals • Easy to setup • Difficult to secure

  4. Wireless Transmission Media • Broadcast Radiodistributes radio signals over long and short distances • Cellular radiois a form of broadcast radio that is used widely for mobile communications

  5. Wireless Transmission Media • Microwaves are radio waves that provide a high-speed signal transmission • A microwave station is an earth-based reflective disk used for microwave communications. • It must transmit in straight line with no obstructions

  6. Wireless Transmission Media • A communications satelliteis a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide area

  7. Network Protocols • Language of the network • Rules of communication • Error resolution • Defines collision and collision recovery • Size of packet • Naming rules for computers

  8. Network Communication Standards

  9. Network Communication Standards

  10. Network Communications Standards • What is Bluetooth? • Short-range radio waves transmitdatabetweenBluetoothdevices

  11. Network Communications Standards What areIrDA,RFID, and Wireless Applications Protocol (WAP)? Radio Frequency Identification (RFID)uses radio signals to communicatewith a tag placed in an object IrDAspecification allows data to be transferred wirelessly via infrared light waves Wireless Applications Protocol (WAP)allow wireless mobile devices to access Internet

  12. Network Communication Standards • Wi-Fiidentifies any network based on the 802.11 standard that facilitates wireless communication • Sometimes referred to as wireless Ethernet

  13. Network Communication Standards • Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data • UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds • IrDA transmits data wirelessly via infrared (IR) light waves • RFIDuses radio signals to communicate with a tag placed in or attached to an object, animal, or person

  14. Network Communication Standards

  15. Wireless Networks • Benefits • No cable to pull • Mobile devices access network resources • Mobility and flexibility for office workers

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