What is wirelss network? • Wireless networks are computer networks that are not connected by cables of any kind. The basis of wireless systems are radio waves, an implementation that takes place at the physical level of network structure. Wireless technologies are widely used in both home and business computer networks.
Types of Wireless Network Technologies • WLANS: Wireless Local Area Networks • WPANS: Wireless Personal Area Networks • WMANS: Wireless Metropolitan Area Networks • WWANS: Wireless Wide Area Networks
WLANS: Wireless Local Area Networks • WLANS allow users in a local area, such as a university campus or library, to form a network or gain access to the internet. A temporary network can be formed by a small number of users without the need of an access point; given that they do not need access to network resources.
Wi-Fi: • Wi-Fi is the industry name for wireless local area network (WLAN) communication technology related to the IEEE 802.11 family of wireless networking standards. Wi-Fi technology first became popular with 802.11b, introduced in 1999 and the first standard in that family to enjoy mainstream adoption.
What is 802.11b • 802.11b is a Wi-Fi wireless network communication technology. • 802.11bLANs support a theoretical maximum data rate of 11 Mbps. Although comparable to traditional Ethernet (10 Mbps), its performs significantly slower than newer Wi-Fi and Ethernet technologies including 802.11g and Fast Ethernet.
SOME FACTS ABOUT Wi-Fi • Wi-Fi Connections Do Not Require an Access Point • Some Types of Wi-Fi Are Incompatible With Each Other • Wi-Fi Connection Speed Varies With Distance • A Wi-Fi Network Can Span Many Miles (Kilometers), Or Just a Few Yards Wi-Fi Is Not the Only Form of Wireless Networking
WPANS: Wireless Personal Area Networks • The two current technologies for wireless personal area networks are Infra Red (IR) and Bluetooth (IEEE 802.15). These will allow the connectivity of personal devices within an area of about 30 feet. However, IR requires a direct line of site and the range is less.
Bluetooth • Bluetooth is a specification (IEEE 802.15.1) for the use of low-power radio communications to link phones, computers and other network devices over short distances without wires. The name Bluetooth is borrowed from HaroldBluetooth, a king in Denmark more than 1,000 years ago.
Bluetooth technology was designed primarily to support simple wireless networking of personal consumer devices and peripherals, including cell phones, PDAs, and wireless headsets. Wireless signals transmitted with Bluetooth cover short distances, typically up to 30 feet (10 meters). Bluetooth devices generally communicate at less than 1 Mbps.
WMANS: Wireless Metropolitan Area Networks • This technology allows the connection of multiple networks in a metropolitan area such as different buildings in a city, which can be an alternative or backup to laying copper or fiber cabling.
WWANS: Wireless Wide Area Networks • These types of networks can be maintained over large areas, such as cities or countries, via multiple satellite systems or antenna sites looked after by an ISP. These types of systems are referred to as 2G (2nd Generation) systems.