In data communications, a method of sending acknowledgements with outgoing messages, e.g., in HDLC, messages from A to B contain information on the frames received by A from B.

• 在数据通讯技术中,将确认应答随发送的信息一起发出的方法,如在高级数据链路控制(HDLC)中,从A到B的信息中包含A收到B发出帧信息。