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1、单工(One-way)、半双工HDX(Half-duplex)、全双工FDX(Full-duplex)通信方式 单工通信,又称单向通信,即只能有一个方向的通信而没有反方向的交互。无线电广播或有线广播及电视广播就属于此类。半双工通信又称双向交替通信,即通信双方都可以发送或接收信息,但不能同时发送或接收信息。这种通信方式是一方发送另一方接收,过一会再反过来,即分时进行,如无线对讲机。全双工通信又称双向同时通信,即通信双方可以同时发送和接收信息,如市话,通信线路一旦接通后,电话用户就占用了一个信道,无论用户是否在讲话,只要用户不挂断,信道就一直被占用着。一般情况
1, One-way, Half-duplex, Full-duplex FDX (Full-duplex) Communication Simplex communication, also known as one-way communication, that is, there can be only one direction of communication There is no opposite direction of interaction. Radio or cablecasting and television broadcasting fall into this category. Half-duplex communication is also called two-way alternating communication, that is, both parties can send or receive messages, but can not send or receive messages at the same time. This communication is one party to send the other party to receive, after a while and then turn, that is, time-sharing, such as wireless intercom. Full duplex communication, also known as two-way simultaneous communication, that is, both sides of the communication can send and receive information, such as local calls, once the communication line is connected, the phone users take up a channel, regardless of whether the user is talking, as long as the user does not hang up, The channel has been occupied. generally