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The basic part of the Bluetooth system consists of the radio chip and controller, as shown in the figure above. The Link Manager (LM) is software that controls link setup, authentication, link configuration, and other protocols. The hardware underlying the LM is the link controller (LC). These two perform the following tasks:
- Sending and receiving data.
- Paging and inquiries.
- Setting up connections.
- Authentication.
- Negotiating and setting up link types, i.e., SCO or ACL.
- Determining the frame type of each packet.
- Placing a device in sniff or hold mode.
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