Infrared – It is light made up of electromagnetic energy. Remote controls for TV, DVD players and other devices use infrared. It is a way of devices communicating. E.g. in a remote control, when you press a button the processor recognises what command you want the TV to make. So it creates a message in binary code and sends it to the TV. The TV then receives it and carries out the command, whether this be changing the channel or increasing the volume. Binary code is used therefore the complexity of the command will change the amount of time that processor needs to create the command so this effects speed. It isn’t noticed about though, because the time differences are so short.
Bluetooth – Like infrared, Bluetooth is a way of devices communicating. Many things these days use Bluetooth, like mobile phones and satellite navigation systems. Bluetooth has a wave length of 12.5cm, so if two devices are connected and they are more than 12.5cm away from each other, then they cannot continue with the transfer. The frequency of Bluetooth is at 2.4GHz.
3G – 3G stands for third generation. It is mainly used in mobile phones e.g. iPhone 4. 3G lets you surf the web at higher speeds, also it improves the quality and speed of streaming video and audio online. Download speeds are also good on a 3G network. 3G speeds can go up to 7.2MB. That’s the same speed as some broadband speeds.
IEEE 802.11 – This is a standard that a wireless device has to go though so that it can work. There are various types of 802.11. These include ‘a’, ‘b’, ‘g’, and ‘n’. Routers and other wireless devices usually have the type of 802.11 standards they use. Most routers use G at the moment, but N is becoming more popular.
My smart phone used the wireless technology of 3G and Wi-Fi.
There are different types of security that you could use for your wireless network. Some include WEP, WPA and WPA2. A WEP key is the simplest form of security. It is a code made up of numbers and letters and you have to put this code in when you want to join a network. It’s the easiest to crack. WPA and WPA2 are the most advanced types of security. They encrypt the router and make it hard to hack into the network.
Bluetooth – Like infrared, Bluetooth is a way of devices communicating. Many things these days use Bluetooth, like mobile phones and satellite navigation systems. Bluetooth has a wave length of 12.5cm, so if two devices are connected and they are more than 12.5cm away from each other, then they cannot continue with the transfer. The frequency of Bluetooth is at 2.4GHz.
3G – 3G stands for third generation. It is mainly used in mobile phones e.g. iPhone 4. 3G lets you surf the web at higher speeds, also it improves the quality and speed of streaming video and audio online. Download speeds are also good on a 3G network. 3G speeds can go up to 7.2MB. That’s the same speed as some broadband speeds.
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