A technician in a government closet needs the larger square push-pull fiber connector, not the small duplex connector used on an SFP. Which connector is that?
Select an answer to reveal the explanation.
Short Explanation
You want the bigger square fiber plug that pushes on and pulls off, not the little duplex plug that usually sits in an SFP, not the round bayonet, and not the copper plug on a patch cord. That larger square fiber connector is SC. Size is the clue the small LC does not match.
Full Explanation
An SC connector is the larger square push-pull fiber connector. An LC connector is the smaller duplex connector commonly seated in an SFP. The technician asked for the larger one, so the connector is SC. Calling LC the larger of the two reverses the sizes. An ST connector is a round bayonet fiber connector. It is not a square push-pull plug. An RJ45 is the eight-position connector used on twisted-pair copper. It is not a fiber connector and it is not what an SFP fiber port uses. Exam caveat: some older patch panels still use ST or SC while new SFPs use LC, so the connector on the panel and the connector on the optic both have to match the patch cord. Operational check: look at the end face and the latch, fit an SC cord to the panel port, and do not force an LC plug into an SC coupler. If the panel is SC and the optic is LC, use an SC-to-LC patch cord rather than forcing the wrong plug into the coupler. Do not mix an SC panel port with an LC optic and call the link certified. Match the connector at both ends of the patch, then recheck the loss.