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Chapter 7.docx

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York University
Administrative Studies
ADMS 2511
Carl Lapp

Chapter 7: Wireless, Mobile Computing, and Mobile Commerce  Wireless: Describes telecommunications in which electromagnetic wave, rather that wire/cable is used to carry signal between communication devices. Mobile: Something that changes its location overtime.  The ability to communicate anytime and anywhere provides organizations with a strategic advantage by increasing productivity and sped and improving customer service. Mobile Computing: real time, wireless connection between a mobile device and other computing environment such as intranet or Internet. Mobile Commerce: Transactions that re conducted in a wireless environment, especially via Internet. Pervasive Computing (ubiquitous computing): Means the virtually every object has processing power with wireless or wired connections to a global network. Wireless Devices are becoming productive and convenient because: 1. They make productive use of time that was formerly wasted (e.g. sending work e-mail while commuting) 2. They provide for more flexible work location because people can carry devices with them 3. Wireless technology enables them to allocate between work, personal and professional obligation. Wireless Application Protocol (WAP): Is the standard that enables wireless devices to access web-based information and services. Older devices contained Microbrewers. Major types of Wireless Media: Microwave Transmission: Systems are widely used for high-volume, long-distance, lone-of-sight communication. It has high bandwidth, inexpensive, but must have unobstructed line of sight, and susceptible to environmental interference. Satellite Transmission: systems that make use of communication satellites. They have high bandwidth and large coverage. But are expensive, must have unobstructed line of sight, and must use encryption of security. The higher a satellite orbits, the large its footprint (coverage area) There’re 3 Types: 1) Geostationary (GEO): Use in TV signal. They have Propagation Delay disadvantage 2) Medium Earth Orbit (MEO): Use in GPS 3) Low Earth Orbit (LEO): Use in Telephone GPS: Is a wireless system that uses satellites to enable users to determine their position anywhere on earth. Radio Transmission: Uses radio-wave frequencies to send data directly between transmitters and receivers. They are inexpensive and singles pass through walls, but need encryption for privacy and create electrical interference problems. E.g. LAN Infrared Transmission: it uses infrared light that is not visible to human eyes. Can only be used for short distances. E.g. Remote controls.  Wireless Networks Effective Distance: Short-Range: Connect one device to another wirelessly. It has a range of 30 meters. Bluetooth: It’s used to create small Personal Area Network (a computer network used for communication among computer devices close to one person). It has low power consumption & uses omnidirectional waves Ultra-Wideband (UWB): Is a high-bandwidth wireless technology with transmission speeds in excess of 100 Mbps. Used in streaming multimedia from PC to TV. It’s also used in real-time location indicators. Near-field Communications (NFC): It has the shortest-range, used in mobile devices and credit cards, where you can swipe your devices or card within a few centimeters of point-of-sale terminal to pay for items Medium-Range: Wireless Fidelity (Wi-Fi): is a medium ranger WLAN, which is basically a wire LAN but without the cables. It provides fast internet access from public hotspots located at airports, hotels, offices, homes. Most WLANs are the 802.11g standard, they provide low cost simple Internet access. Three factors preventing WIFI market from expanding: Roaming, Security, and Cost. Mesh Networks: They use multiple Wi-Fi access point to create a WAN that can be very large and cover wide area, example of a city. Wide-Area: Connect users to Internet over geographically dispersed territory, operating over licensed spectr Cellular Radio (cell phones): use radio wave to provide two-way communication. The cell phone communicates with radio antennas places within geographic areas, called cells. Cell Technology 1G,2G,.... Wireless Broadband (WiMax): Provide wireless access to 50 KM. It’s a secure system offering voice & vide  Mobile Computing: Refers to real-time wireless connection between a mobile device and other computing environment, such as Internet or an intranet. It has two major characteristics: 1. Mobility (meaning users carry devices with them and can initiate a real-time contract with other systems. 2. Broad Reach (user can carry an open mobile device; they can be reached instantly, even across great distances. These characteristics create Five values: 1. Ubiquity: Mobile device ability to provide information and c
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