1. Wireless WANs Aram Mostowfi aram2700@hotmail.com MCA – University Of Madras
2. Wireless WAN Components Networking over vast distances Provides coverage inside & outside buildings. Use Cellular networks for data transmission like: CDMA, GSM, GPRS. Wireless WAN user devices. Radio NICs Base Stations Aram Mostowfi - University Of Madras - aram2700@hotmail.com
3. Wireless WAN User Devices Are Small for Easy Mobility Data Collector Mobile Phones PDA Laptop Wireless WAN User Devices Aram Mostowfi - University Of Madras - aram2700@hotmail.com
4. Wireless WAN Radio NIC: To interface a laptop or PDA to a wireless WAN, you need to purchase an applicable wireless WAN radio NIC (Network Interface Controller). Aram Mostowfi - University Of Madras - aram2700@hotmail.com
5. Wireless WAN Base Station 1- Cell towers: these base stations rely on wires to connect to a distribution system that provides switching and an interface to the Internet. In most cases, the towers reside outdoors to provide maximum coverage. Aram Mostowfi - University Of Madras - aram2700@hotmail.com
6. Wireless WAN Base Station 2- Satellite in orbit: On the ground, a user aims a dish antenna at the satellite, and the satellite receives the signal and retransmits the signal back to an Earth station. Aram Mostowfi - University Of Madras - aram2700@hotmail.com
7. Wireless WAN Wireless WAN Systems: 1- Cellular-Based Wireless WANs. Cell towers, Concentrators, Voice Switches & Data gateways. 2- Space-Based Wireless WANs. Earth orbiting satellites, Base Station, Antenna. Aram Mostowfi - University Of Madras - aram2700@hotmail.com
8. Cellular-Based Wireless WANs The cell tower receives signals from user devices and transmits information back to the user. The component that makes the system a wireless WAN is the data gateway. The gateway is able to interface with data protocols in a way that makes it possible for users to surf the Internet, send and receive e-mails, and utilize corporate applications. Aram Mostowfi - University Of Madras - aram2700@hotmail.com
9. Cellular-Based Wireless WANs SMS is a wireless form of the familiar instant messaging which is a text messaging system capable of sending a couple hundred characters at a time. Many web sites use Wireless Markup Language (WML) to transform regular web pages into a format that is more easily read on a small device, such as a PDA or cell phone. WML also reduces the graphics on the page to compensate for the slower data rates of wireless WAN technologies. Aram Mostowfi - University Of Madras - aram2700@hotmail.com
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11. Using modem to connect PC to cellular system, (Digital Signal => Analog Signal).
28. 2way exchange of data, allowing a user to send data up to the satellite (and vice versa).Aram Mostowfi - University Of Madras - aram2700@hotmail.com
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30. To obtain global coverage, a minimum of three satellites is required.
