In general, the world protocol refers to a set of rules or conventions for executing a particular task. In data communications, Protocol is used in a narrower sense to mean the set of rules or specifications used to implement one or more layers of the OSI model. We have already encountered the ELA 232-D interface, which is a protocol used at the physical layer in the OSI model.
A protocol in data communications is the set of rules, or specifications used to implement one or more layers of the OSI model.
Data link protocols are sets of specifications used to implement the data link layer. To this end, they contain rules for line discipline, flow control, and error handling among others.
A data link protocol is a set of specifications used to implement the data link layer.
Data link protocols can be divides into tow Subgroups :
1. Asynchronous protocols
2. Synchronous protocols
- Asynchronous protocols treat each character in a bit stream independently.
- Synchronous protocols take the whole bit stream and Chop it into characters of equal size.
Please read the Asynchronous Protocol ,Click the link
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