The reversing of transmission direction from sender to receiver or vice versa when a half-duplex circuit is used.
In a half duplex transmission system the time between when one block of data has been sent and received and the next block can be transmitted. The delay is caused by the fact that the transmit line must be reconfigured to be the receive line and a response from the receiver processed and the line then reconfigured for transmit before a second block can be sent.
an action where one side of a communications session stops transmitting and "turns the line around" to receive (or vice versa); there is usually a delay while this action takes place (i.e., line turnaround delay); this is a condition specific to half-duplex, switched carrier connections
The interval on a transmission link between the time one block of data was sent and received and the time the next one can be sent.