Keywords: Bluetooth wireless Technology
Data Communications is the transfer of data or information between a source and a receiver. It is interested in the transfer of data, the method of transfer and the preservation of the data during the transfer process. There are few evaluation criteria for data communications, which are the performance, consistency, reliability, recovery and security. There will be a lot of expectations and requirements for future data communication, as people are becoming more and more dependant on technology. For example, we want more bandwidth, faster data rates, larger coverage, data security, data integrity, low cost and better quality of data.  We will look into these needs in the field of our study, which is the Bluetooth Technology.
What is Bluetooth?
The Bluetooth is a wireless technology that is a worldwide specification for short-range radio that provides connection between electronic devices. It has been introduced mainly to replace wire cables, such as between computer and peripherals, or mobile phone and hands-free headset. Bluetooth technology enables a fast, easy and convenient environment. Although its speeds and distances are currently limited, it has remarkable flexibility by communicating through walls and other obstacles, which makes it an ideal choice for home or office networks, mainly personal networks. 
How does it communicate?
In order to communicate effectively, the devices must know what the bits transmitted and received means and whether the message sent is correct. This is set through a set of 7 protocols in Bluetooth. Bluetooth transmit/receive data through radio signals, through a method called Gaussian Frequency Shift Keying (GFSK). A binary 1 is represented by a positive frequency deviation, while a binary 0 by a negative frequency deviation. 
Technical standards and performance levels
Bluetooth operates in the unlicensed 2.4 GHz–2.4835 GHz ISM frequency band. As numerous other technologies also operate in this band, Bluetooth uses a frequency-hopping spread-spectrum (FHSS) technology to solve interference problems. The FHSS scheme uses 79 different radio channels by changing frequency about 1,600 times per second to enable high performance in noisy radio environments. Each channel that is cut into time slots of 625 microseconds hops to another channel in a pseudo-random order. In the ISM band, Bluetooth technology permits transmission speeds of up to 1 Mbps and achieves a throughput of approximately 720 kbps (corresponding to 3 voice channels), with second generation plans to increase to 2 Mbps. Although the data rates are low compared to those of 802.11 wireless LANs, it is still three to eight times the average speed of parallel and serial ports, respectively. This rate is adequately fast for many of the applications for which Bluetooth was conceived. Moreover, it is anticipated that even faster data rates will be available in the future. It has low power consumption, drawing only 0.3 mA in standby mode. This enables maximum performance longevity for battery powered devices....