Synchronous Connection Oriented (SCO): Here, a fixed slot is allotted in each direction. The users confirm the passkeys to pair the devices. Secure simple paining method is used where the master generates a passkey and both devices display the same passkey. #Medialink bluetooth codeEach frame is associated with 126-bits overhead for access code and header, as well as a 250 µsec/hop setting time. Time slots of 625 µsec are defined the master starts transmitting in odd slots while the slaves start transmitting in even slots. In the simplest method, time division multiplexing is used for master – slave communications. L2CAP provides support for both connection oriented as well as connectionless services.īluetooth devices are categorised into a master device and slave devices. Logical Link Control and Adaptation Protocol (L2CAP) L2CAP provides adaption between upper layer frame and baseband layer frame format. The other main functions of LMP are device authentication, message encryption and negotiation of packet sizes. #Medialink bluetooth BluetoothLink Manager Protocol (LMP): LMP establishes logical links between Bluetooth devices and maintains the links for enabling communications. There are two main protocols in the link layer, namely, Link Manager Protocol (LMP) and Logical Link Control and Adaptation Protocol (L2CAP). Taking into consideration, the challenges of wireless transmission like interference, noise and deep fades. Sending data by converting the raw bit streams of the radio layer into frames and defining key formats. Managing the links between the devices throughout data communications. One of the devices is assigned as master and the other is the slave. The following diagram shows the position of link layers in the Bluetooth protocol architecture −ĭefining procedures for discovering Bluetooth devices.Įstablishing logical links between the Bluetooth devices that are communicating. The functions of the link layer is very close to MAC (medium access control) sublayer of the OSI model. The Bluetooth link layer outlines the way Bluetooth devices can use the raw transmission facility given by the radio layer to exchange information.
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