Wi-fi and Bluetooth
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Wifi
Bluetooth
- WiFi as it is commonly known is fast becoming the preferred mode of connecting to the internet. WiFi gets its name from a certification called Wireless Fidelity given to networks operating under 802.11 standards.
- WiFi allows computers, PDAs and other devices to connect to a broadband connection in a wireless mode. The 802.11 standard defines the wireless communicationoperating via electromagnetic waves. While reading the descriptions and explanations related to WiFi, one should remember there are different modes for wireless networks like Infrastructure mode and Ad-Hoc mode that can be used for different criteria.
- Wireless LANs use a media access control protocol called Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
- Wi-Fi systems are half duplex shared media configurations, where all stations transmit and receive on the same radio channel.
Bluetooth
- Bluetooth is a wireless technology developed by Ericsson that is designed to be a cable replacement. It operates on the 2.4GHz frequency band, like WiFi, and is officially known as IEEE standard 802.15.1.
- It is most commonly used with wireless headsets and car kits, but can also be used for network access, moving files from one device to another, or with wireless input devices such as a mouse and keyboard - among many other uses.
- There are multiple versions of the Bluetooth specification in use, and in order for full functionality to be possible, the devices on both sides of a connection must be of the same version.
- Bluetooth protocol comprises of a number of protocols which can be divided into four categories. Each of these protocols is responsible for specific type of task and stands on its own. The four categories are:
- Baseband
- The Link Manager Protocol
- Logical Link Control and Adaptation - Layer (L2CAP)
- Service Discovery Protocol (SDP)