WIRELESS NETWORKED DIGITAL DEVICES BY SAIKIRAN PANJALA
- 2. Wireless networks: A wireless network is any type of computer network that uses wireless data connection for connecting network Digital device: A device that represents information using the convention building on the binary digits 0 or 1.
- 3. The Wireless Revolution • Mobile phones have become mobile platforms for delivering digital data, used for recording and downloading photos, video and music, Internet access, and transmitting payments. • An array of technologies provides high-speed wireless access to the Internet for PCs and other wireless handheld devices and cell phones. • Businesses increasingly use wireless to cut costs, increase flexibility, and create new products and services.
- 4. Wireless Transmission Media and Devices • Microwave systems transmit high-frequency radio signals through the atmosphere. • Communication satellites are used for geographically dispersed organizations
- 5. Devices for Wireless Transmission • Cellular telephones • Personal Digital Assistants (PDAs) • Smart phones
- 6. Advantages It is convenient to use This wireless network can serve increased number of clients with existing equipment Cost is less than wired network
- 7. Cellular Network Standards and Generations Standards: • Global System for Mobile Communication (GSM) • Code Division Multiple Access (CDMA)
- 8. STANDARDS GSM: Developed to provide common 2nd- generation technology for Europe.200 million customers worldwide, almost 5 million in the North America CDMA: It is a channel access method used by various radio communication technologies
- 9. Cellular Generations • 1G: Analog cellular networks for voice communication • 2G: Digital wireless networks, primarily for voice communication; limited data transmission capability
- 10. Cellular Generations: (Continued) 2.5G: This is between 2nd and 3rd generations and it is associated with General packet radio services(GPRS) • 3G: High-speed; mobile; supports video; always- on transmission for e-mail, Web browsing, instant messaging
- 11. Mobile Wireless Standards for Web Access • Wireless Application Protocol (WAP): Uses Wireless Markup Language (WML) and micro browsers • I-mode: Uses compact HTML and allows for continuous connection
- 12. Wireless Application Protocol (WAP) versus I-mode Figure 7-15
- 13. The Institute of Electrical and Electronics Engineers (IEEE) established global wireless network standards Global Wireless Network Standards: • IEEE 802.15 (Bluetooth) for the Personal Area Network (PAN) • IEEE 802.11 (Wi-Fi) for the Local Area Network (LAN)
- 14. A Bluetooth Network (PAN)
- 15. Bluetooth: It is a wireless technology standard for exchanging data. It Can link up to 8 devices in 10-m area Low power is required for data transmision
- 16. Wi-Fi Infrastructure mode: Devices use access point to communicate with wired network • Ad-hoc mode (peer-to-peer): Wireless devices communicate directly with each other
- 17. Radio Frequency Identification (RFID) Radio Frequency Identification (RFID) systems: Provide a powerful technology for tracking the movement of goods throughout the supply chain
- 18. How RFID Works
- 19. Conclusion Wireless networks having low cost compared to the wired network. High flexibility.