Where is the flannel in the communications industry?
The Odf is a fiber optic distribution frame, there is a flange in it, and the flange is used for the tail, and the tail is needed for the end, which is the head that you can use,
The fibre-optic cable is very fragile and has to be in the flange. After the end, the interface provided to you is a flanged head.
It's like your computer power line is not directly used, you need a plug to plug into the socket
