1) one-way communications (simplex transmission) of information can be sent only by each party to serve as one of the recipient or the sender, for example, is sometimes called the communication sent one-way.
1) one-way communication (simplex transmission) data can be transmitted only by each party to act either as a recipient or sender. Sometimes the communication is the transmission line.
1) one way communication (simplex transmission) data can be transmitted by each department will be the only one like A receiver or sender. This is sometimes called the communication that send one direction.