* Question
| What is included in the data link layer specification? |
* Answer
| 1) The data link layer provides services for the network layer.These services form a black box model required by the data link layer.
2) The requirements of the logical link control sublayer include: HART frame format, HART device address structure, security services for information integrity, and error detection code.These actual time values directly reflect some physical layer performance characteristics (such as channel evaluation time, transmit/receive state transition time). |
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