English: High-Level Data Link Control
Chinese: Advanced Data Link Control
Category: Network
High-Level Data Link Control (HDLC) Advanced Data Link Control (Procedures) (HDLC) HDLC is a data link layer protocol that transmits data in synchronous online, a bit-oriented data link layer protocol, which is developed by the International Standardization Organization (ISO). HDLC is a supercoming of IBM's Synchronous Data Link Control Procedures (SDLC). SDLC is successful by the BiSync communication protocol, initially introduced through IBM system network structure (SNA) products. Another name of HDLC is a Advanced Data Communication Control Procedure (ADCCP), which is named by the National Standard Association (ANSI), but HDLC is more acceptable. Due to the different suppliers, there is an incompatibility between SDLC and HDLC.
HDLC is a bit-oriented, which means that the data is monitored, transmitted data consists of binary data, and there is no special control code, but the information in the frame contains control and response commands. HDLC supports full-duplex transmission. At the same time, the data is transmitted in both directions, resulting in a higher throughput rate. HDLC is suitable for point-to-point and multi-point (multiplexed or one-to-many) connections. The subset of HDLC is used to X. 25, ISDN and Frame Relay Network Provide signaling and control data links.
Reference: http://www.tyrtvu.edu.cn/wangyekejian/jisuanwangluojichu/cha2/hdlcgc.htm
