The Advanced Data Link Control (HDLC) protocol is based on a data link layer protocol that promotes data that can be transmitted to the next layer in the transmission process (that is, there is no loss in error release and the sequence is correct. ). Another important feature of HDLC is traffic control, in other words, once the receiver receives data, it can be transferred immediately. HDLC has two different implementations: Advanced Data Link Control Normal Response Mode, that is, HDLC NRM (also known as SDLC) and HDLC link access process balance (LAPB). The second use is more common. HDLC is part of the X.25 stack.
HDLC is a bit-oriented synchronous communication protocol, mainly providing complete data transparency for full-duplex peers. It supports peer-to-peer links that do not have a function of permanent management station per link terminal. On the other hand, HDLC NRM has a permanent base station and one or more secondary stations.
HDLC LAPB is an efficient protocol to ensure that traffic control, error monitoring and recovery it requires minimal overhead. If the data is transmitted in both directions (full duplex), the data frame itself transmits the required information to ensure data integrity.
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