วันอังคารที่ 18 มกราคม พ.ศ. 2554

Data Communications

Before we will talk about the Data communications, we will get to know the technology of communication. Information together before. We can see that the image is the image of Figure 3 is Wired, Fixed Wireless and Mobile Wireless,
By the color green is a Wired. Wired is Data transmission via cable. Currently, it is still available, ie ADSL or High Speed Internet service at home by that the line has to be dragged into our house through the Modem and connect our computer to play with Internet service providers
Currently, most ADSL uses the copper wire in the connection. But it will have some service providers. Start the install Fiber Optic cables, which will result in data communication speed up to 10 times, which many in the future is expected to change as a Fiber Optic cables instead of copper in the present

Later, we mention that some of Fixed Wireless as shown yellow. This will send and receive data wirelessly through the air. It will be a first pairing together. Between Receiver with the transmitter, such as Bluetooth, Wi-Fi or Wi-MAX.
         Receiving or sending data in this manner. Have limitations in terms of the service area or the Coverage Area, such as the use of Bluetooth is a term for sending and receiving up to 10 meters, or we use Wi-Fi, too we can use if we are in The signal covers a radius. But if we leave the radius Connection will be lost immediately.
        
Currently use this type. For example, using Wi-MAX 802.16d is unfortunate user can not move out of service. The connection is lost immediately. It will not be able to catch Roaming with Wi-MAX towers in the neighborhood.

End of story Mobile Wireless in the Pink. Fixed Wireless is the same principle, but what the difference is the use of Mobile Wireless Roaming will be able to use. Other areas by the connection remain active continuously. For example, using cell phones during the 2G / 3G or HSPA, we can use Video Call, or Download the data continuously while we were moving in the areas of service 3G or with the use of Wi-BRO (Wireless Broadband) is. Wi-MAX 802.16e is the same for the development of new forms that can cross over to Roaming the neighborhood. The Roaming or we may call another that the "Hand Over" is that we make the connection to send and receive Data with base station or the service point and a movement to use in other areas. The connection remains active continuously.

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