In high level data link control (HDLC), the part of data station that supports the primary control functions of the data link, generates commands for transmission, and interprets received responses.

• 在高级数据链路控制(HDLC)规程中,数据站的一部分,它支持数据链路主要控制功能,产生传输命令及解释收到的应答信息。