What's the scientific name of crystal head

Crystal head is a standardized telecommunication network interface. Provide interfaces for sound and data transmission. The crystal head was first defined in the bell system general service ordering code system of the United States. In the 1970s, it was used to provide computer-aided telephone equipment authorized by the Federal Communications Commission. Subsequently, the crystal head was incorporated into Chapter 47 of part 68 of the code of federal regulations.

matters needing attention:

1. Cross line connection is used between the same type of equipment, and through line connection is used between different types of equipment.

2. Routers and PCs belong to DTE type equipment, while switches and hubs belong to DCE type equipment.

3. RJ45 network connector generally has two standard practices: 568a and 568B. According to the same standard, i.e. through line and different standards, i.e. cross line.

4. No matter how the wiring is, when testing with RJ-45 line measuring instrument after the final completion, the eight indicator lights should flash in turn.