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Difference between ACL and SCO Link in Bluetooth
Two types of data links are defined by Bluetooth link layers−
Synchronous Connection Oriented (SCO) Link
Asynchronous Connection-Less (ACL) Link
SCO is a symmetric, point-to-point link between the master device and the slave device connected via Bluetooth.
ACL is a point – to – multipoint link for transmitting general data packets using Bluetooth connection. ACL is used for irregular traffic between a master device and one or more slave devices.
Differences between SCO and ACL
| SCO | ACL | |
|---|---|---|
| 1 | SCO provides a circuit switched connection, where a dedicated, point-to-point link is established between the master device and the slave device before communication starts. | ACL is a packet oriented link, i.e. the link establishes a packet – switched network. |
| 2 | SCO is a symmetric link, i.e. fixed slots are allocated for each direction. | Both symmetric and asymmetric traffic are supported. The master device controls the bandwidth of the ACL link. |
| 3 | SCO radio links are used for time critical data transfer, mainly voice data. | ACL is used for transmission of data traffic which are delivered at irregular intervals. |
| 4 | A master device can support three SCO links with the same or different slaves. A slave device can have a maximum of three SCO links with its master device. | One master device which connects with maximum seven slave devices via ACL links to form a Piconet. |
| 5 | The focus is minimization of time latency. | The main objective is to maintain data integrity rather than time latency. |
| 6 | The maximum data rate of SCO link is 64,000 bps (bits per second). | The maximum data rates of ACL links can reach a 57.6 Kbps in downlink and 721 bps in uplink. |
| 7 | Packet retransmissions are not allowed, for assuring real-time transfer of voice traffic. | Packet retransmissions are allowed to ensure data integrity. |
| 8 | Forward Error Correction (FEC) is applied for data reliability. | Both FEC as well as Backward Error Correction with retransmissions are adopted for data reliability. |
Updated on: 11-Sep-2020
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