Amodem from which communications occur in discrete units, and in which the start of a unit is signaled by a start bit at the front, and a stop bit at the back signals the end of the unit.

Asynchronous modem

Explanation:

In an asynchronous modem, data is transmitted in an infrequent stream of small packets, in which a start bit at the front signals the start of a unit, and the end of the unit is signaled by a stop bit at the back.

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explanation:

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