無線技術簡介ppt課件-wenkub.com
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【正文】 2022 The McGrawHill Companies, All Rights Reserved 12 Objectives ? Examine wireless technology and its applications ? Assess wireless working technologies ? Review wireless work applications ? Discuss the issues and constraints of a wireless work 13 Why Choose a Wireless LAN? 14 Choose a Wireless LAN ? When installing a new LAN ? When extending an existing LAN ? When replacing an existing wired LAN 15 Considerations When Installing a New LAN ? Wired LANs ? May be less expensive ? More reliable ? Easier to manage and troubleshoot ? Wireless LANs (WLANs) ? When installing cable is not practical ? Network is temporary ? Dynamic physical configuration 16 Extending a Wired Network ? To add additional workstations to the work ? Provide users a way to access their workstation away from their desk 17 Issues with Wireless LANs ? Materials used in construction of building may impede radio frequency munication ? Interference from other RF devices ? Shape of the area where wireless access is desired 18 Wired Small Office, Home Office A home work using a shared Inter connection 19 Wireless Small Office, Home Office A wireless LAN using a cable modem or DSL bridge to connect to the Inter 110 WLAN Connected to Wired Network Wireless access points are often used to provide a connection to a wired work 111 Cost Issues ? A wireless work eliminates the cost of cable runs ? A wireless work eliminates the cost of installing the cable ? A wireless work provides immediate connection anywhere in the wireless range of its access points 112 Scalability ? Scalability is the work’s ability to change as needed to meet the expanding needs of an anization or home ? Wireless works are generally more scalable than a wired work ? a wireless workstation only needs to be within the range of the access point 113 Interoperability ? The International Organization for Standardization (ISO) developed the Open Systems Interconnection Reference Model (OSI) to help ensure all manufacturer’s equipment would be interoperable. ? The physical layer PHY standards define the medium ? The data link MAC standards define how to control access to the medium 114 Portability ? For software: the cap
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