Standards Are Not Color-Blind

In fiber optics, color codes relay a lot of vital information. They help electrical contractors determine which fiber, cable or connector they are working with and ensure the installation is correct. How well do you know fiber optic color codes?

1. Outdoor fiber optic cables are always colored ______ to help the jacket withstand the harmful effects of solar radiation.

Correct Answer: Black

2. An outdoor single-mode fiber cable will be connected indoors to matching cables that are colored ______ to indicate they are made with single-mode fiber.

Correct Answer: Yellow

3. Multimode cables have many colors to distinguish the types of fibers. Which of the following colors are not used in the standards to identify multimode cables?

Correct Answer: White

4. Older fiber optic cables using 62.5/125 fiber, now called OM1 fiber, are supposed to have jackets colored ______.

Correct Answer: Orange

5. Older fiber optic cables using the original 50/125 fiber, now called OM2 fiber, are supposed to have jackets colored ______.

Correct Answer: Orange

6. If two fibers such as OM1 and OM3 are supposed to have the same color jacket, the way to determine the fiber type is to read the printing on the cable jacket.

Correct Answer: True

7. Fiber optic cables containing laser-optimized 50/125 fibers—now called OM3 and OM4 fiber—are supposed to have jackets colored ______.

Correct Answer: Aqua

8. Connectors also are color-coded, so if you see a ______ connector, you know the fiber is 50/125 multimode.

Correct Answer: Black or aqua

9. Single-mode connectors may be color-coded either blue or green. Can they be used interchangeably or mated to each other?

Correct Answer: No, blue is physical-contact ferrule while green has an angled physical-contact ferrule

10. In an older fiber optic local area network that is being upgraded, you find an orange cable with a beige connector. What kind of fiber does that indicate?

Correct Answer: OM1 62.5/125