What is the Difference Between HDLC and SDLC?
🆚 Go to Comparative Table 🆚HDLC (High-Level Data Link Control) and SDLC (Synchronous Data Link Control) are both networking protocols that provide point-to-multipoint interconnection. However, they differ in several ways:
- Origin: HDLC is a modified version of SDLC and was developed by ISO from SDLC with some changes.
- Orientation: SDLC is a character-oriented protocol, while HDLC is bit-oriented.
- Control Information: HDLC contains more control information than SDLC and adds error correction and flow control capabilities to SDLC.
- Modes: HDLC introduces two additional modes: Asynchronous Response Mode (ARM) and Asynchronous Balanced Mode (ABM).
- Frame Transfer: HDLC enables frames that are not a multiple of 8 bits, while SDLC does not.
- Addresses: HDLC enables addresses more than 1 byte, while SDLC does not.
- Escape Character: HDLC uses an escape character to indicate when the bit stuffing method should be used, while SDLC does not.
In summary, HDLC is a more advanced version of SDLC, offering additional features and capabilities. While both protocols share the same frame format and have similar field functions, HDLC is more widely adopted and provides better performance in terms of speed and error correction.
Comparative Table: HDLC vs SDLC
HDLC (High-Level Data Link Control) and SDLC (Synchronous Data Link Control) are two data link layer protocols used for transmitting data between network nodes. Here is a table comparing the differences between HDLC and SDLC:
Characteristic | HDLC | SDLC |
---|---|---|
Usage | Frames are used to encapsulate data | SDLC packets are used |
Transmission | Supports both asynchronous and synchronous transmission | Only supports synchronous transmission |
Transfer Modes | Supports three transfer modes (Normal Response Mode, Asynchronous Balanced Mode, and Asynchronous Response Mode) | Supports only one transfer mode (Normal Response Mode) |
Fault Detection | More efficient fault detection | Less efficient fault detection |
Bit Division | Data is divided into bits before being sent over the network | Characters are divided into bits before being sent over the network |
Escape Character | Uses an escape character to indicate when bit stuffing should be used | Does not use an escape character |
Origin | Developed by ISO (International Organization for Standardization) | Developed by IBM (International Business Machines Corporation) |
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