DATA LINK LAYER

Communications Systems Glossary

Communications Systems — Open Systems Interconnection reference model — Data link layer

 

 

 

 

 

 

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Information on Data link layer

The data-link layer is the second layer of the ISO OSI 7-layer reference model. This layer allows point-to-point or node-to-node control. It is often called the frame level because it specifies how to organise data into frames and how to transmit frames over a network. It specifies of frame format; bit or byte stuffing; error detection and correction and data-flow control providing an error-free link level communications facility to higher levels. Cyclic Redundancy Checking (CRC) is a common method utilised by this layer to detect errors. The High Level Data Link Control (HDLC) protocol is an example of a protocol at this level as is IBM's Synchronous Data Link Control (SDLC) protocol.


Other topics in our resources on Communications Systems related to Data link layer include: 
 
  • Physical layer (Layer 1)
  • network layer (Layer 3)
  • transport layer (Layer 4)
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  • session layer (Layer 5)
  • presentation layer (Layer 6)
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  • application layer (Layer 7)
  • Media access control protocol (MAC)
  • Logical Link Control (LLC)

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