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Connectivity technologies > Wired technologies - Pg. 51

an existing wired network infrastructure. Speeds range from 11mbps to 54 mbps but can degrade the farther a user gets from a wireless access point. Wireless Ethernet standards such as 802.16 are currently under development for wide-scale implementations of wireless Ethernet in the form of a Metropolitan Area Network. More information about wireless Ethernet can be found at: http://www.ieee802.org Bluetooth and Infrared (IR) Bluetooth is another wireless standard used to allow devices within relatively close proximity to exchange data. For more information, see the Bluetooth Web site: http://www.bluetooth.org Infrared uses a beam of infrared light to exchange data in the same way a remote control is used to change a television channel. It is slower than Bluetooth, and the devices must be positioned in direct line-of-sight from each other to communicate. 2.5.2 Wired technologies Below is a list of wired technologies used in today's networks. Plain Old Telephony Services (POTS) Telephony services can be used to connect to IT networks (for example, a modem connection from a desktop). Even though this is an old technology, it is still a valid and working method today. Digital Subscriber Line (DSL), Cable On digital networks data can be transmitted with a higher rate. DSL is a a successor of the analog phone network, and makes a digital connection between subscriber and provider. Cable networks are based on the digital Cable TV networks. Cradle Mobile devices such as PDAs come with cradles that connect to a PC to synchronize data. Often, this same connection can enable the device to access other network resources and the Internet. For situations where wireless connectivity is not an option, the cradle provides an opportunity for the user to synchronize data with a network server or PC. Chapter 2. Technology options 51