Wireless WANs
- 1. Wireless WANsAram Mostowfiaram2700@hotmail.comMCA – University Of Madras
- 2. Wireless WAN ComponentsNetworking over vast distancesProvides coverage inside & outside buildings.Use Cellular networks for data transmission like: CDMA, GSM, GPRS.Wireless WAN user devices.Radio NICsBase StationsAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 3. Wireless WAN User Devices Are Small for Easy MobilityData Collector Mobile Phones PDA LaptopWireless WAN User DevicesAram 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 WANWireless 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 WANsThe 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 WANsSMS 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
- 10. Cellular-Based Wireless WAN Generations1st Generation (1 G) :Analog signals.
- 11. Using modem to connect PC to cellular system, (Digital Signal => Analog Signal).
- 12. 4 KHz Voice Channel.
- 13. 20-30 kbps data transmission speed.
- 14. Using Frequency Modulation (FM).Aram Mostowfi - University Of Madras - aram2700@hotmail.com
- 15. Cellular-Based Wireless WAN Generations2nd Generation (2 G):Most of the telecommunications operators today have 2G systems.
- 16. General Packet Radio Service (GPRS) offers high-speed data rates over a global system for mobile communications (GSM) network.
- 18. GPRS 171.2 kbps
- 19. SMSAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 20. Cellular-Based Wireless WAN Generations3rd Generation (3 G):Many of the telecommunications operators are now beginning to offer.
- 21. 2-Mbps data rates for in-building implementations.
- 22. up to 384 kbps in urban areas.
- 23. 144 kbps in rural areas.
- 25. Thus, both 3G and wireless LAN systems complement each otherAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 26. Cellular-Based Wireless WAN GenerationsAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 27. Space-Based Wireless WANsSatellites1-way for broadcasting television and other communications .
- 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
- 29. Space-Based Wireless WANsComponents:frequencies between 450 MHz and 20 GHz.
- 30. To obtain global coverage, a minimum of three satellites is required.
- 31. The satellite acts as a signal repeater.
- 32. Example: Satellite Mobile Phones: Thuraya& Iridium.Aram Mostowfi - University Of Madras - aram2700@hotmail.com
- 33. Space-Based Wireless WANsAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 34. Space-Based Wireless WANsAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 35. Wireless WAN Technologiesfocus on modulation of voice and data
- 36. Each user has a dedicated channel
- 37. This significantly reduces interference between wireless WAN user devices and base stations.
- 39. FDMA
- 40. TDMA
- 41. CDMAAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 42. Wireless WAN TechnologiesAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 43. Coverage
- 44. Speed
- 45. Data Security
- 46. Hotspots
- 47. CostsW-WAN Vs W-LANAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 48. ~100 meters MAC, Key authentication, Physical accessAram Mostowfi - University Of Madras - aram2700@hotmail.com
- 49. THANK YOUAram Mostowfi - University Of Madras - aram2700@hotmail.com