Advanced Data Communication Control Procedures
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In telecommunication, an Advanced Data Communication Control Procedures (ADCCP) is a bit-oriented data link layer protocol used to provide point-to-point and point-to-multipoint transmission of data frames that contain error-control information.
Note: ADCCP closely resembles high-level data link control (HDLC) and synchronous data link control (SDLC).
Source: from Federal Standard 1037C