HDLC
I.1 Introduction
The data link layer is the second layer in the OSI seven-layer model and its protocols define rules for the orderly exchange of data information between two adjacent nodes connected by a data link. Final framing, flow control between nodes, and error detection and correction are added at this layer. In previous chapters the data link layer was discussed in a practical manner. It is a use protocol as it provides a model for interfacing to a serial bus.
The two types of protocol are:
• Asynchronous protocol.
• Synchronous protocol.
Asynchronous communications uses start-stop method of communication where characters are sent between nodes, as illustrated in Figure I.1. Special characters are used to control the data flow. Typical ...
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