35 essentials of business information systems chapter

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Unformatted text preview: • Create networked applications that can run on many types of computers • Protected by firewalls • Extranets • Allow authorized vendors and customers access to an internal intranet • Used for collaboration • Also subject to firewall protection 6.35 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Wireless Revolution • Wireless devices • PDAs, BlackBerry, smart phones • Cellular systems • Competing standards for cellular service • United States: CDMA • Most of rest of world: GSM • Third-generation (3G) networks • Higher transmission speeds suitable for broadband Internet access 6.36 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Wireless Revolution • Wireless computer networks and Internet access • Bluetooth (802.15) • Links up to 8 devices in 10-m area using low-power, radiobased communication • Useful for personal networking (PANs) • Wi-Fi (802.11) • Set of standard: 802.11a, 802.11b, 802.11g, 802.11n • Used for wireless LAN and wireless Internet access • Use access points: Device with radio receiver/transmitter for connecting wireless devices to a wired LAN 6.37 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Wireless Revolution A Bluetooth Network (PAN) Figure 6-15 Bluetooth enables a variety of devices, including cell phones, PDAs, wireless keyboards and mice, PCs, and printers, to interact wirelessly with each other within a small 30-foot (10meter) area. In addition to the links shown, Bluetooth can be used to network similar devices to send data from one PC to another, for example. 6.38 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Wireless Revolution An 802.11 Wireless LAN Figure 6-16 Mobile laptop computers equipped with wireless network interface cards link to the wired LAN by communicating with the access point. The access point uses radio waves to transmit network signals from the wired network to the client adapters, which convert them into data that the mobile device can understand. The client adapter then transmits the data from the mobile device back to the access point, which forwards the data to the wired network. 6.39 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless The Wireless Revolution • Wireless computer networks and Internet access • Wi-Fi (cont.) • Hotspots: One or more access points in public place to provide maximum wireless coverage for a specific area • Weak security features • WiMax (802.16) • Wireless access range of 31 miles • Require WiMax antennas • Broadband cellular wireless • Many cell services offer Wi-Fi capabilities for Internet access 6.40 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wi...
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This document was uploaded on 02/11/2014.

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