Asynchronous connection-oriented logical transport
data-transmission link in the Bluetooth system
The Bluetooth Asynchronous Connection-oriented logical transport (ACL) is one of two types of logical transport defined in the Bluetooth Core Specification, either BR/EDR ACL or LE ACL. BR/EDR ACL is the ACL logical transport variant used with Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR, also known as Bluetooth Classic) whilst LE ACL is the ACL logical transport variant used with Bluetooth Low Energy (LE).
The ACL transports are part of the Bluetooth data transport architecture.
Note that all definitions of Bluetooth terminology, protocols and procedures including ACL are defined in the Bluetooth Core Specification which is published by the standards development organisation, the Bluetooth Special Interest Group (Bluetooth SIG).
The Bluetooth Data Transport Architecture
The architecture section of the Bluetooth Core Specification defines a number of concepts which collectively constitute the Bluetooth data transport architecture. Key amongst these concepts are the Physical Channel, Physical Link, Logical Link and Logical Transport. Certain combinations are intended for use in different application types which have particular requirements regarding issues such as topology, timing, reliability and radio channel use.
The LE ACL logical transport is used with either an LE-C logical link, which carries control data or an LE-U logical link which is for user data. It is based on an LE Active Physical Link and the LE Piconet Physical Channel. See Figure 1.
The BR/EDR ACL logical transport is used with either an ACL-C logical link for control data or an ACL-U logical link for user data and it is based on a BR/EDR Active Physical Link and either the BR/EDR Basic Piconet Physical Channel or the BR/EDR Adapted Piconet Physical Channel.
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