RJ-45
RJ-45 connector: Each twisted-pair cable connects to a network card and hub (or switch) via an RJ-45 connector (commonly known as a crystal head).
An RJ-45 plug is a plastic connector that can only be inserted in a fixed direction and automatically prevents it from falling out. Both ends of the twisted-pair cable must be fitted with this RJ-45 connector to plug into the RJ-45 port of a network card (NIC), hub, or switch for network communication.
RJ11
The RJ11 interface is similar to the RJ45 interface, but it only has 4 pins (RJ45 has 8). In computer systems, RJ11 is mainly used to connect modems. In everyday applications, RJ-11 is commonly found on telephone lines.
CAT6A
connectors come in various types, including unshielded integrated, unshielded separate, shielded integrated, and shielded separate. There is also another type, RJ12, which is commonly used for voice communication. Its structure is the same as the previous two types, but it has six pins (6p6c).
Additionally, there are two variations: six-slot four-pin (6p4c) and six-slot two-pin (6p2c).
