Data transmission

Data transmission

When dealing with data that can be sent either asynchronously or synchronously, however, you can use the synchronous connection oriented (SCO) mechanism mostly for voice communications,
whereas an asynchronous connectionless (ACL) mechanism is meant mostly for data communications. For example, time-division duplex (TDD) is employed by both ACL and SCO. Each of these offers support for 16 types. Four of these packets represent the same thing in each type due to the need for an uninterrupted data transmission. In contrast, SCO packets are sent at periodic times, so that they are transmitted in groups without permitting any interruptions from other transmissions.
Furthermore, SCO packets are sent without polling from the sending unit, while ACL links offer support for both asymmetric and symmetric transmission modes. The master unit actually controls the bandwidth in an effort to define how much of each slave unit can be used. This is possible
due to the fact that slave units are not able to transmit data until it has been polled by the master unit. The master unit, however, can unit the ACL link to send broadcast messages to the slave units.

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