Asynchronous Connection-Less
Encyclopedia
Asynchronous Connection-Less (ACL) is a communications protocol
. It is used as a transmission link used for data communication in the Bluetooth
system or as a definition with access code(72bit) + packet header(54bit) + payload + CRC(16bit).
Asynchronous Connection-Less Link (ACL) is used when data is more important than avoiding latency.
In this type of link, if a payload encapsulated in the frame is corrupted, it is retransmitted.
A secondary returns an ACL frame in the available odd-numbered slot if and only if the previous slot has been addressed to it.
ACL can use one, three or more slots and can achieve a maximum data rate of 721 kbps.
D(1)(2)
(1) M : rate 2/3 FEC used
H : no FEC used
(2) 1 : 1 slot used for one frame
3 : 3 slots used for one frame
5 : 5 slots used for one frame
Communications protocol
A communications protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications...
. It is used as a transmission link used for data communication in the Bluetooth
Bluetooth
Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances from fixed and mobile devices, creating personal area networks with high levels of security...
system or as a definition with access code(72bit) + packet header(54bit) + payload + CRC(16bit).
Asynchronous Connection-Less Link (ACL) is used when data is more important than avoiding latency.
In this type of link, if a payload encapsulated in the frame is corrupted, it is retransmitted.
A secondary returns an ACL frame in the available odd-numbered slot if and only if the previous slot has been addressed to it.
ACL can use one, three or more slots and can achieve a maximum data rate of 721 kbps.
Packet Types
DM1, DH1, DM3, DH3, DM5, DH5, AUX1D(1)(2)
(1) M : rate 2/3 FEC used
H : no FEC used
(2) 1 : 1 slot used for one frame
3 : 3 slots used for one frame
5 : 5 slots used for one frame