Describe the two types of physical links between Bluetooth devices.
What will be an ideal response?
A synchronous connection-oriented (SCO) link is a symmetric point-to-point link between a master and a single slave. This link functions like a circuit-switched link by using reserved time slots at fixed intervals. A master and slave can each support up to three simultaneous SCO links. A SCO link carries mainly voice transmissions at a speed of 64 Kbps. These transmissions occur in both directions.
An extended synchronous connection-oriented link (eSCO) link is similar to a SCO link. It is also bidirectional, but can be symmetric or asymmetric (different data rates for master to slave and slave to master), and is used for point-to-point, constant rate data, but with limited retransmissions in case errors should happen.
An asynchronous connectionless (ACL) link is a packet-switched link used for data transmissions. Sometimes called a point-to-multipoint link, the ACL link is from one master to all the slaves participating on the piconet. A piconet can support only a single ACL link between one master and up to seven slaves. In the time slots not reserved for the SCO links, the master can establish an ACL and transfer data to any slave. A slave already engaged in an SCO link can also have an ACL link.
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