It establishes the link between Bluetooth devices and ongoing link management. This protocol would contain the security parts such as authentication, encryption, control and negotiation of Baseband packet sizes.

Logical link control and adaptation protocol (L2CAP)

It would maintain the upper-layer protocols of the Baseband layer. L2CAP presents connectionless and connection-oriented services.

Service discovery protocol (SDP)

It provides the detail device information, services and the distinctiveness of the services that would be required to allow the establishment of a connection between two or more Bluetooth devices.

5. Cable Replacement Protocol

In the Bluetooth design RFCOMM is considered as the cable replacement protocol. RFCOMM stands for a virtual serial port which provides the surrogating of cable technologies as translucent as promising. Serial ports communications interfaces are one of the universal forms employed along with computing and communications devices. Consequently, we can easily say that the RFCOMM provides the replacement of serial port cables within a short span of regulations as well as the adjustments of the accessible devices. RFCOMM presents binary data transportation and emulates EIA-232 control signals above the Bluetooth Baseband layer. EIA-232 (RS-232) is a extensively used for serial port interface.

6. Telephony Control Protocols

Bluetooth illustrates a telephony control protocol. TCS BIN (telephony control specification binary) is considered as a bit-oriented protocol that stipulates call control signaling for the founding of voice and data calls between Bluetooth devices. It what's more supervises "Mobility Procedures" for handling groups of Bluetooth TCS devices.

7. Adopted Protocols

Following are the adopted protocols

• PPP: The point-to-point protocol is known as Internet protocol that is used for transporting IP datagram over a point-to-point link.

• TCP/UDP/IP: That is the basic protocol of the TCP/IP protocol suite.

• OBEX: The object exchange protocol is known as the session protocol for exchanging the objects developed by the Infrared Data Association (IrDA).

• WAE/WAP: Bluetooth contains the wireless application environment and wireless application protocol during its architecture.

8. Usage Models

Following are the some usage models:

• File transfer: The file transfer usage model contains the transfer of directories, files, documents, images and streaming media formats. This usage model involves the potential to browse certain information on a remote device.

• Internet Bridge: While using this usage model, a PC is wirelessly connected to a cellular phone to provide dial-up networking and fax capabilities.

• LAN access: This usage model generates the devices to access a LAN on a piconet.

• Synchronization: This usage model would provide a synchronization of device-to-device personal and management information for example calendar, phone book, message and note information.

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