However, the overhead significantly slows transmissions, so is generally not used in relatively error-free environments, with the exception of packet headers. The ARQ scheme requires that the header error and cyclic redundancy checks are okay. When they are, an acknowledge is sent. When they aren't, the data is resent. Frequency band hops make it difficult for anyone to eavesdrop.
Authentication allows a user to control connectivity to only devices specified.
The quality of security is excellent for most applications. However, it is not the highest level available, and for those users who require it, the suggestion is to investigate separate network transfer protocols and security software. The basic part of the Bluetooth system consists of the radio chip and controller, as shown in the figure above. Paging and inquiries. Setting up connections.