Thursday, July 25, 2019

Wireless management Essay Example | Topics and Well Written Essays - 1250 words

Wireless management - Essay Example In such cases, you would use a WLAN Router, often available as combination unit of WLAN-router and DSL / ADSL modem. Using a Wireless Access-point, networks can be configured with systems connected via cables and via Wireless connections. (WLAN, 2006). If we analyze an overview of the content manager we would come to know the role "content manager" plays in managing various services. It enables you to edit services, including mobile services. These reusable services can be invoked as a normal service, or by another service to return a result to that service. Wireless provides several mobile services that are ready for deployment, including those for such Personal Information Management (PIM) tools as calendar, address book, fax, and mail. (Oracle 9i, AS).Today wireless data networks exist in such a wide variety that it is difficult to compare and categorize them separately. Some wireless data networks run over wireless voice networks such as mobile telephone networks. Examples are CD PD (Cellular Digital Packet Data), HSCSD (High Speed Circuit Switched Data), PDC-P (Packet Data Cellular) and GPRS (General Packet Radio Service). Other wireless networks run on their own physical networks, utilizing anything from antennas built into handheld devices to large antennas mounted on towers. Examples are 802.11, LMDS and MMDS. A few wireless networks are intended only to connect small devices over short distances. Blue tooth is an example. (Wireless, 2006).Here we would discuss about managing Wifi or 802.11 networks. ... The speed at which data can be transmitted over a modulated carrier depends on a number of factors, including available bandwidth and the specific type of modulation used. Complex modulation schemes, such as 64-Quadrature Ampliture Modulation on 54-Mbps 802.11 WLANs, carry more bits per unit of time than simpler schemes, like the Differential Binary Phase Shift Keying used on 1-Mbps WLANs. If a complex modulation scheme isn't supported by high-quality RF signals, errors will occur. Because signal quality decreases over the RF medium, there's always a trade-off between speed and distance. Radio waves that travel through the air attenuate faster than RF signals carried by cable modems running over a hybrid fiber-coax cabling system. (Network Computing, 2006) Wi-Fi networks use radio spectrum designated by the FCC and other regulatory bodies for unlicensed operators. This "buy, install and run" approach is one thing that makes Wi-Fi so appealing. Although you don't need a license to operate a Wi-Fi system, vendors' products must be certified to ensure they adhere to FCC rules. (Network Computing, 2006) FCC regulations govern the use of 83.5 MHz of spectrum between 2.4 and 2.4835 GHz, known as the 2.4 GHz ISM (Industrial, Scientific and Medical) band, as well as the 300 MHz of spectrum in the 5 GHz UNII (Unlicensed National Information Infrastructure) bands. The 5 GHz UNII bands include 200 MHz between 5.15 and 5.35 GHz and 100 MHz between 5.725 and 5.825 GHz. Each Wi-Fi device, whether it's a PC card, a NIC or an AP (access point), acts as a transceiver that transmits and receives radio signals. Since all Wi-Fi systems use high-frequency microwave signals, the signals attenuate rapidly. Higher-frequency 5-GHz 802.11a signals experience s omewhat greater

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