Crystal head is a kind of plastic joint that can insert in a fixed direction and automatically prevent falling off, commonly known as "crystal head". The professional term is RJ-45 connector (RJ-45 is a network interface specification, similar to RJ-11 interface, which is commonly used to connect telephone lines). It is called "crystal head" because of its bright appearance. Crystal head is suitable for on-site end connection between equipments or horizontal subsystems. High density polyethylene (HDPE) is used as shell material. The RJ-45 plug must be installed at both ends of the twisted pair for network communication on the RJ-45 interface of the network card (NIC), hub (Hub) or switch. The two ends of each twisted pair are connected with the network card and the hub (or switch) by installing a crystal head.
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