In Bluetooth , each baseband packet starts with an Access code, which can be one of 3 types: CAC (Channel Access Code). DAC (Device Access Code). IAC (Inquiry Access Code). The respective access code types are used for a Bluetooth unit in different operating modes. The CAC (Channel Access Code) identifies a piconet. The DAC (Device Access Code) is used for special signalling procedures and the IAC (Inquiry Access Code) is used to discover other Bluetooth units that are in range.
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