ST (Straight Tip) Port: Recognizable by its round shape and bayonet-style coupling, the ST port is commonly used in industrial and military applications. It is known for its ruggedness and durability. If a cable is connected to this port, don't disconnect it. Update: I plugged the. That's the port where a cable will attach to carry data from the fiber optic network to your device. The port on your modem or router should be located on the back or the side. There are several lights on the ONT, when these lights change colour or flash, it means something is happening. What do the lights on the Openreach fibre. To connect your fiber optic cable to a router, ensure you have the following: Fiber optic modem (ONT): Most fiber connections require an Optical Network Terminal (ONT), provided by your ISP.
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