HDLC Abbreviation

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Popular abbreviations of HDLC:

Searching for HDLC abbreviation / HDLC full form leads to different results in different categories. The below table illustrates the popular acronyms among them.

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What does HDLC mean?

HDLC stands for High-Level Data Link Control. HDLC is a data link protocol used to transmit the data between the nodes. The arrangement of data is made in the structure of frames. The transmission of frames is done through a network. HDLC supports multipoint and point-to-point communication. 

Roles & Responsibilities

• International Organization formed HDLC for Standardization. 
• High-level data link control is a derivation of synchronous data link control. 
• HDLC includes connectionless services and connection-based services. 
• HDLC is used to form frames for Link Access Procedure Balanced (LAPB) and ISDN protocols etc. 

Types of frames in HDLC

HDLC frames can be divided into three types.

• Supervisory frame HDLC: This frame is also called S-frame. Supervisory structures control the flow and error. 
• Un-numbered frame HDLC: This frame is also called a U-frame. Un-numbered frames are used for doing the link management. 
• Information frame HDLC: This frame is also known as I-frame. This frame behaves as the data carrier to the network layer. 

Each frame of HDLC is composed of six fields. Such as:

• FCS: The checking of sequence for the error detection is done by this field. This field is composed of 2 or 4 bytes of the frame.
• Control: This field controls the flow and error information. This field has a one or two-byte frame.
• Flag (left): This shows the beginning of the frame. It has the 8-bit sequence as 01111110.
• Payload: This field has variable length depending on the network. This is a carrier field for transporting the data from the network.
• Address: This field tells about the address of the receiver.
• Flag (right): This field is the closing of the frame. It also has an 8-bit sequence, which remains the same as the left side flag.