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NE40E V800R010C00 Feature Description - WAN Access 01

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Overviews of HDLC and IP-Trunk

Overviews of HDLC and IP-Trunk


As a bit-oriented link layer protocol, HDLC transparently transmits bit flows of any type without specifying data as a set of characters.

  • Bit flow: data is transmitted in bit flows.

  • Character set: data is transmitted in character sets.

Through the trunk technology, you can aggregate many physical interfaces into an aggregation group to balance received and sent data among these interfaces and to provide more highly-reliable connections.


Compared with other data link layer protocols, HDLC has the following features:

  • Full-duplex communication, which can send data continuously without waiting for acknowledgment and has high data transmission efficiency.

  • All frames adopt the Circle Redundancy Check (CRC) that numbers information frames. In this way, the information frames can be prevented from being lost or received repeatedly; therefore, the transmission reliability is improved.

  • Transmission control function is separated from process function. Therefore, HDLC has high flexibility and excellent control function.

  • HDLC does not depend on any character set and can transmit data transparently.

  • Zero-Bit Insertion, which is used to perform transparent transmission, is easy to be applied on hardware.

Updated: 2018-07-04

Document ID: EDOC1100027168

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