The Session Layer provides the management and data flow control services, which are covered by L2CAP and the lower ends of RFCOMM/SDP. The Presentation Layer provides a common representation for Application Layer data by adding service structure to the units of data, which is the main task of RFCOMM/SDP.
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Figure 13 shows the familiar Open Systems Interconnect (OSI) standard reference model for communications protocol stacks. Although Bluetooth does not exactly match the model, it is a useful exercise to relate the different parts of the Bluetooth stack to the various parts of the model.
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Bluetooth is that when the device is within the scope of a other devices automatically start the transfer information without the user noticing. a small network between the devices is created and the user can accessed as if there were cables.
http://ecomputernotes.com/computernetworkingnotes/communication-networks/bluetooth
• Bluetooth is, with the infrared, one of the major wireless technologies developed to achieve WPAN. Bluetooth is a wireless LAN technology used to connect devices of different functions such as telephones, computers (laptop or desktop), notebooks, cameras, printers and so on.
http://ecomputernotes.com/computernetworkingnotes/communication-networks/bluetooth
• The Bluetooth radio layer corresponds to the physical layer of OSI model. • It deals with ratio transmission and modulation. • The radio layer moves data from master to slave or vice versa. • It is a low power system that uses 2.4 GHz ISM band in a range of 10 meters.
http://ecomputernotes.com/computernetworkingnotes/communication-networks/bluetooth
Bluetooth is enabled through 5 layers of software and hardware. These layers distribute functional responsibility where the bottom layers handle the lowest level details and progressively higher layers handle ever more general concerns.
http://developer.earthskater.net/library/bluetooth.htm
To this end, Bluetooth does not just define a radio system, it also defines a software stack to enable applications to find other Bluetooth devices in the area, discover what services they can offer, and use those services.
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The baseband part of the Bluetooth specification describes an algorithm which can calculate a frequency hop sequence from a Bluetooth device address and a Bluetooth clock. When Slaves connect to a Master, they are told the Bluetooth device address and clock of the Master.
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Figure 2: Bluetooth Layer Diagram. At the top resides an Application Program Interface layer (API). This layer is a library of software modules that connect the Bluetooth hardware module to the host application. The host is the device that wants to use Bluetooth for its communication requirements. It could be a laptop, a headphone, a PDA or any other device. The Logical Link Control and Adaptation Protocol (L2CAP) layer connects to the APIs and is responsible for defining Logical Connections. This layer defines the source and destination for each link and adapts the data to/from the API and Bluetooth.
http://developer.earthskater.net/library/bluetooth.htm
A key feature of the Bluetooth specification is that it aims to allow devices from lots of different manufacturers to work with one another.
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what layer is bluetooth on osi
Physical layer is bluetooth on OSI. Bluetooth is in physical layer of OSI.