It's basically like this: assuming a fully equipped 576 core capacity optical junction box is point A, multiple optical cables can be terminated (not exceeding the total capacity of the optical cables), and then you have a 48 core optical cable led out from point A to the junction box at point B. From the junction box at point B, 8 branch optical cables are split out, and each cable is fused with 6 cores. Then, these 8 6-core branch optical cables are connected to different junction boxes for termination, and then fused from the junction box to the broadband panel where the cable enters the household. Then, one end of the tail fiber is connected to the broadband panel, and the other end is connected to the fiber optic onu.
In general, a tail fiber (two ends) is used inside the optical junction box to connect the two directional fiber cores you are using through the tail fiber, which is called the active connection method. In the junction box, it is fusion bonding, which is a fixed connection.
The optical cable must first be terminated and then connected with a tail fiber. For example, if a pair of fibers are connected to a splitter, assuming that the splitter has 8 optical ports, you can use tail fibers to connect each of the 8 optical ports to other devices.