What are the characteristics of the interface of the physical layer?What does each contain?

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