Wireless Networks (CNET - 333) Course Coordinator: - Dr. Nasrullah Armi Department of CNET Faculty of CS&IS Jazan University

Important Notes For Students The objective of these slides is to effectively deliver the course material so as to comprehend the understanding of the topics. These slides are to be used for reference only. Under no circumstances these should be considered as an alternative to the text book. The source for all examinations will be the text book and the slides.

Text Book Textbook: William Stallings, Wireless Communications and Networks, 2nd Ed. Prentice Hall, 2002. The Web site: http://williamstallings.com/Wireless1e.html

Chapter 1 Wireless Comes of Age (Introduction)

Objectives To learn and understand the concept of wireless communication and wireless networks. To understand the history and features of wireless technology. To learn about the limitation and the difficulties regarding the wireless world.

Introduction Guglielmo Marconi invented the wireless telegraph in 1896 Communication by encoding alphanumeric characters in analog signal Sent telegraphic signals across the Atlantic Ocean Communications satellites launched in 1960s Advances in wireless technology Radio, television, mobile telephone, communication satellites More recently Satellite communications, wireless networking, cellular technology

What does Wireless Communications mean? Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.

Wireless Communication Forms Satellite Communication Mobile Communication Wireless Network Communication Infrared Communication Bluetooth Communication

Wireless versus Wired Networking Wireless connections are slower. This difference is the big reason why most larger networks still depend on wired Ethernet for the bulk of their connections. Wireless hardware is more expensive. Depending on the standard supported by your wireless hardware, you pay significantly more for wireless hardware than you do for wired hardware. Wireless networks require no hubs or switches. Most wireless base stations and WAPs (wireless access points), can provide connections for up to 253 simultaneous users, so a larger wireless network (with 50 PCs or more) requires far less hardware.

Wireless Network Wireless Network is a network setup by using radio signal frequency to communicate among computers and other network devices. The two main components of the wireless networks are Wireless Router or Access Point and Wireless Clients.

Access Point In a wireless local area network (WLAN), an access point is a station that transmits and receives data. An access point connects users to other users within the network and also can serve as the point of interconnection between the WLAN and a fixed wire network. Each access point can serve multiple users within a defined network area; as people move beyond the range of one access point, they are automatically handed over to the next one. A small WLAN may only require a single access point; the number required increases as a function of the number of network users and the physical size of the network.

Benefits Of Wireless Networks Convenience: - Access your network resources from any location within your wireless network's coverage area. Mobility: - You're no longer tied to your desk, as you were with a wired connection. Productivity: - Wireless access to the Internet and to your company's key applications and resources helps your staff get the job done and encourages collaboration. Easy setup: - Installation can be quick and cost-effective. Expandable: - Expand wireless networks with existing equipment. Security. Advances in wireless networks provide robust security protections. Cost. Because wireless networks eliminate or reduce wiring costs, they can cost less to operate than wired networks.

Broadband Wireless Technology In communications  broadband is a wide bandwidth  data transmission with an ability to simultaneously transport multiple signals and traffic types. The medium can be coaxial cable, optical fiber, radio or twisted pair. Higher data rates obtainable with broadband wireless technology Graphics, video, audio Shares same advantages of all wireless services: convenience and reduced cost Service can be deployed faster than fixed service No cost of cable plant Service is mobile, deployed almost anywhere

Limitations and Difficulties of Wireless Technologies Wireless is convenient and less expensive Limitations and technical difficulties inhibit wireless technologies Lack of an industry-wide standard Device limitations E.g., small LCD on a mobile telephone can only displaying a few lines of text E.g., browsers of most mobile wireless devices use wireless markup language (WML) instead of HTML

Future Trends WiMAX Is similar to Wi-Fi. Both creates hot spots, but while Wi-Fi can cover several hundred meters, WiMAX has a range of 40 to 50 km. Mobile-Fi Objective is to provide internet access to mobile users at data rates higher than those available in today’s home broadband links. ZigBee works at relatively low data rate over relatively short distances, compared to Wi-Fi. Objective is to develop products that are very low cost, with low power consumption and low data rate. Works on sensors. Ultra Wideband It enables the movement of massive files at high data rates over short distances. Example in home, it allow user to transfer hours of video from a PC to a TV without any messy cords.

Videos Introduction to Wireless Networking https://www.youtube.com/watch?v=okeSqr5eOmU 2. Wireless Networking Tutorial https://www.youtube.com/watch?v=3Bh4PcO2YJE

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