Fixing Connectivity Issues with SC to LC Adapter

A network technician needs to install a new access switch.

After installing the new switch, the technician begins to move connections from the old switch to the new switch.

The old switch used a GBIC with SC connectors, and the new switch uses an SFP with LC connectors.

After connecting the SC connector to the SC- to-LC adapter and plugging it into the switch, the link does not come up as expected.

Which of the following should a network technician perform NEXT?

A.

Replace SFP with a new one.

B.

Fall back to the old switch.

C.

Transpose the fiber pairs.

D.

Replace multimode with single-mode cable.

C.

In this scenario, the network technician installed a new access switch, and after moving the connections from the old switch to the new switch, the link did not come up as expected. The old switch used a GBIC with SC connectors, and the new switch uses an SFP with LC connectors. The technician connected the SC connector to the SC-to-LC adapter and plugged it into the switch, but the link did not come up.

The best course of action for the technician at this point is to transpose the fiber pairs. This means swapping the positions of the two fiber strands within the connector. This is necessary because the SC and LC connectors have different pinouts, so the fiber pairs are not in the correct order when using an SC-to-LC adapter.

To transpose the fiber pairs, the technician will need to use a fiber optic tool, such as a fiber optic cleaver or a fiber optic stripper. The technician will need to carefully strip the fiber cable to expose the two fiber strands, then use the tool to switch the positions of the strands within the connector.

Once the fiber pairs have been transposed, the technician can try connecting the cable again and checking to see if the link comes up. If the link still does not come up, there may be a problem with the SFP or with the cable itself, and the technician may need to try replacing the SFP or using a different cable. However, transposing the fiber pairs is the first step in troubleshooting the issue, as it is a common problem when using adapters to connect different types of fiber connectors.