What are the three main fiber connectors we used in class?

• A. ST, SC, FC
• B. ST, SC, LC
• C. ST, LC, FC
• D. SC, LC, FC

Answer: (B)

Understanding fiber optic connectors means recognizing the styles and sizes you’re most likely to encounter in labs and real networks. The three you’ve focused on are ST, SC, and LC, and they cover a range of locking mechanisms and form factors that help you handle connections confidently.

ST, or Straight Tip, uses a bayonet-style lock. You insert the plug and twist to lock, which makes it sturdy and easy to reconnect, a common sight with older multimode setups and many classroom patches.

SC, the Standard Connector, is a push-pull snap-in type with a 2.5 mm ferrule. It’s renowned for reliability and straightforward mating, so it became a staple in telecom and lab environments.

LC, the Lucent Connector, is a small-form-factor design with a 1.25 mm ferrule and a latch. Its compact size lets you pack many ports into a high-density panel, which is why LC is so prevalent in modern networks.

FC exists as another style with a screw-on connection, but it’s much less common in typical training and standard lab work today. That’s why the trio you learned—ST, SC, and LC—best represents the main connectors you’re most likely to use.