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Wireless Lan | Scribd
The system became operational in and included seven computers deployed over four islands to communicate with the central computer on the Oahu island without using phone lines. Wireless LAN hardware initially cost so much that it was only used as an alternative to cabled LAN in places where cabling was difficult or impossible. Early development included industry-specific solutions and proprietary protocols, but at the end of the s these were replaced by standards, primarily the various versions of IEEE Neither European standard achieved the commercial success of In It operates in both the 2.
Most newer routers are able to utilise both wireless bands, known as dualband. This allows data communications to avoid the crowded 2. Not all channels are available in all regions. A HomeRF group formed in to promote a technology aimed for residential use, but it disbanded at the end of All components that can connect into a wireless medium in a network are referred to as stations STA.
Wireless Networking Technology: From Principles to Successful Implementation
All stations are equipped with wireless network interface controllers WNICs. Wireless stations fall into two categories: wireless access points , and clients. Access points APs , normally wireless routers , are base stations for the wireless network. They transmit and receive radio frequencies for wireless enabled devices to communicate with.
- Wireless Networking Technology: From Principles to Successful Implementation.
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Wireless clients can be mobile devices such as laptops, personal digital assistants , IP phones and other smartphones , or non-portable devices such as desktop computers , printers, and workstations that are equipped with a wireless network interface. An independent BSS IBSS is an ad hoc network that contains no access points, which means they cannot connect to any other basic service set.
Access points in an ESS are connected by a distribution system.
LAN Technologies | ETHERNET
A distribution system DS connects access points in an extended service set. The concept of a DS can be used to increase network coverage through roaming between cells. DS can be wired or wireless.
The IEEE In ad hoc mode, mobile units transmit directly peer-to-peer. In infrastructure mode, mobile units communicate through an access point that serves as a bridge to other networks such as Internet or LAN. Since wireless communication uses a more open medium for communication in comparison to wired LANs, the Many access points will also offer Wi-Fi Protected Setup , a quick but now insecure method of joining a new device to an encrypted network. In infrastructure mode, a base station acts as a wireless access point hub, and nodes communicate through the hub.