wireless LAN

Current needs of telecommunications users will begin to lead to the need for data communications. In addition the user started using communications technology that can be accessed anytime and anywhere. This can be seen from the many users who tend to use wireless networks to communicate. Therefore, mobile data comunication or could be called over a wireless data started to be developed so that users can perform data communications whenever and wherever. To support the user and mobilias developed a flexibility factor-based wireless LAN is called a wireless LAN.

Excess wireless LAN than the wired LAN, include:

1. Mobility user

2. Flexible

3. Easy in installation and maintenance

4. Save

In the wireless LAN topology tedapat two kinds of commonly used peer-to-peer or ad-hoc and access point

a. IBSS topology (Indepenent Basic Service Set)

In this network topology consists of several computers, each equipped with a wireless NIC (Network Interface Card). Each computer can communicate directly with all the wireless computers in a BSS (Basic Service Set) or a single cell is not connected to a network backbone. This topology is used when the user is in a complex planning. This topology is also commonly called peer-to-peer, or Ad-Hoc.


b. Access Point topology

In this topology of this network using wirelesss network access point to connect to each other. Access point can act as a hub that mengghubungkan several computers in one or several BSS BSS and can also act as a bridge that connects between the wireless LAN with the wired LAN. Each access Pont has a limited range. Actual coverage depends on environmental conditions, manufacturing, and also a good scope indor and outdoor. In the indoor propagation model access point coverage ranges from 150-300 feet (45-90 meters) and outdoor 1000 feet (300 meters). In addition the number of users in one maksimsal access point depending on the type of manufacturing is used. Generally ranges from 10-100 users.

There are two kinds of access point devices, namely:

a. Dedicated Hardware Access Point

Is a device that is specially made to work as an access point.

b. Software Access Point

Is a computer equipped with a wireless NIC and access point software is made to act as an access point.