I understand it this way: \x0d\ Ethernet equipment has only one port connected to the internal switching chip, but when it is led out, it leads to the optical port and the electrical port. Then when you use it, you can only use the electric port or the light port, not both. If you have to plug in optical fiber and network cable at the same time, by default, the device has only one port, usually an electrical port. \x0d\ This is the meaning of multiplex port. \x0d\ 1000base-X: Gigabit Ethernet optical fiber transmission standard; \x0d\SFP: An encapsulation form of optical module, which is widely used in Ethernet at present.