SUMMARY:

BLUETOOTH TECHNOLOGY:-
o Bluetooth is designed to be a personal area network, where participating entities are mobile and require sporadic communication with others.
o It’s omni directional.
o Bluetooth operates in the 2.4 GHz area of the spectrum, and provides a Range of 10 meters.
o It offers transfer speeds of around 720 Kbps.
o Bluetooth devices are connected to each other; they form a network called Piconet. Each piconet can have a master, and up to seven slaves.
o To accommodate interference from other signals, Bluetooth uses frequency hopping.
o To conserve power, devices can go into three modes when they aren’t actively involved in a piconet.
o In increasing order of power consumption, they can be in park mode, hold mode and sniff mode.
o All the slave devices in a piconet are assigned an active member address(AM_ADDR).when a slave enters the park mode; it will give up its AM_ADDR and get a park address, PM_ADDR.
o One of Bluetooth’s advantages is that it can handle both data (asynchronous) and voice (synchronous), which others such as infra-red can’t.
o Every Bluetooth devices has a 48-bit BDAddr (Bluetooth device address) burned into its ROM. This address can’t be easily changed by the user.
o A Bluetooth device can be set to periodically scan for other devices in its vicinity or users can perform manual scans.

WI-FI TECHNOLOGY:-
o Bluetooth is a convenient way of communication for a personal network, but it is not suitable as an LAN replacement, or for perennial data transfer.
o Wi-Fi and abbreviation for wireless fidelity, is a wireless standard that promises mobility while offering data rates comparable to those of a wired LAN.
o Wi-Fi is a collection of standards ratified by the IEEE. In 1997; IEEE approved the 802.11 standard, which laid down the specification for wireless LAN.
o Revisions were made to this standard and these resulted in three other standards, namely 802.11a, 802.11b and 802.11g.The entire family of 802.11 standards is collectively called Wi-Fi. The name Wi-Fi was first given to the 802.11b standard. Approved in 1999, 802.11b Offered extensions to the original 802.11 that improved the highest data rate from 2 Mbps to 11 Mbps. It operates in the 2.4 GHz frequency range, like as the original and has a range of about 300 feet. The latest is 802.11g that has the highest data rate of 100Mbps.
o 802.11a is a standard that operates at a frequency of 5 GHz, and hence it is incompatible with 802.11b.
o The range of 802.11a is lower than that 802.11b; hence, more access points are needed to cover a large area.
o 802.11a is less susceptible to interference when compared to other standards such as 802.11b.
o To solve the limitation of ‘b’ and at the same time provide the speed of ‘a’, the 802.11g was introduced.
o 802.11g offers speeds of 100 Mbps, while maintaining compatibility with 802.11b networks, while maintaining compatibility with 802.11b networks, so a laptop with an 802.11g card will be able to use an 802.11b access point.
o Wi-Fi has a basic level of security provided at the physical level, called WEP.
o All Wi-fi products come with a 40-bit encryption key. A 104-bit encryption key is also available, and it is recommended that the largest available key should be used.