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What are the characteristics of the interface of the physical layer?What does each contain?
2022-08-05 05:23:00 【Long long way to go big company】
What are the characteristics of the interface of the physical layer?What does each contain?
(1) Mechanical characteristics: Describe the shape and size of the connectors used in the interface, the number and arrangement of leads, fixing and locking devices, etc.
(2) Electrical characteristics: indicate the range of voltages that appear on each line of the interface cable.
(3) Functional characteristics: indicate what the voltage of a certain level on a certain line means.
(4) Procedure features: describe the order of occurrence of various possible events for different functions.
Supplementary example
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