Yesterday I talk about basic Wireless LAN Technology that useful? Today I will speak at the Wireless LAN Technology 2 Technology, which is content with current.

Advantages of Wireless LAN. 

Wireless LAN technology for the benefits of the network when compared with normal-wired that enough delegates will have:

1. Mobility: Wireless LAN, users can connect into the network of organizations in all areas at any time within the signal coverage of Wireless LAN systems. 
2. Simple & Quick Installation: Wireless LAN systems use relatively simple and convenient, fast Wireless LAN technology, because technology is available in Plug & Play manner without requiring the installation of the cable difficult and turbulent 
3. Reach Difficult Area: Wireless LAN technology that can send signals. To provide a connection into the network in areas that are difficult to install and run the cable. Including areas that do not install cable. 
4. Reduce Future Cost: Cost for implementation of Wireless LAN technology is relatively high in the first If included in the cost of system implementation, maintenance costs, equipment life. Including costs in the case want to expand the number of users in the future it will consider Wireless LAN technology is less expensive. 
5. Scalability: Wireless LAN Technology to define and modify the format used in a variety of formats. But as we will be applying to the Application.

Standard Wireless LAN.

Use standard technology Wireless LAN IEEE 802.11 standard is a standard. Can send data using the frequency. In a manner similar to radio transmission. The bandwidth used for sending data all 3 periods as follows:

• Frequency range 900 MHz: This frequency range is in the first frequency range. Start using the Wireless LAN technology will be able to send data at speeds of only 1-2 Mbps.
• Frequency range 2.4 GHz: a frequency range that is used is currently Frequency range and can use this in every country around the world 2.4 GHz frequency range can be sending data at speeds from 1 Mbps to 11 Mbps, but will cover for sending data in less distance. system than to use a range of 900 MHz also in 2.4 GHz frequency range is also subdivided into a different standard is IEEE 802.11b standard can be sending data at speeds of 11, 5.5, 2 and 1 Mbps respectively. depending on the distance between the Access Point with Wireless Card IEEE 802.11b standard, which is a standard for sending data is widely used today. And a standard for sending data on the frequency range 2.4 GHz is IEEE 802.11g standard, which can be sending data at speeds higher than 20 Mbps.
• Frequency range 5 GHz: a frequency range that can be sending data at the shortest distance in all 3 frequency range but have been able to send data at speeds up to 54 Mbps, but is deplorable that in some country Including Thailand. Can not use Wireless LAN technology on the frequency range. Which are sending data on the frequency range. Runs on standard IEEE 802.11a.

Technology used for sending data over a network Wireless LAN.

The technology used for sending data on wireless networks are 2 forms together: 

1.  Frequency Hopping Spread Spectrum (FHSS): FHSS.

Old technology. Can get support – sending data at relatively low speed, just about 1 – 2 Mbps FHSS uses only way to share information are small. Then send the information over time, but if you have information you want to send more than 1 data will be sent to share information on different frequencies. The alternate will be used to send data. Taking the time to send information about each one frequency in 0.4 seconds. This can be sending data at up to 79 different frequency ranges.

2. Direct Sequence Spread Spectrum (DSSS)

Technology DSSS data is used to continuously send data to. No jump-FHSS will share the same frequency range in the data transmission frequency range is 11 to each frequency range using a value of approximately 22 MHz frequency allows for sending data at higher speeds is approximately 1 – 11 Mbps but because of how for sending data DSSS frequency range is used for sending data is quite broad. Cause the amount of data can be sent at the same time. Reduced to only 3 frequency ranges.

Relate Link : MAC Address Wireless LAN Part I How to Install LAN Card