Multimode Fiber

Multimode fiber has been around a long time and is still being used in many premises cabling applications. There also are continuous upgrades in multimode technology. How well have you kept up with multimode fiber technology and applications?

1. Networks that use multimode fiber are generally cheaper because _______.

Correct Answer: Transceivers for multimode links are cheaper

2. Multimode fiber’s larger core size is not as critical in dimensions, so multimode fiber is easier and cheaper to make than single-mode.

Correct Answer: False

3. The designation “OM” by TIA-568 for optical fiber, multimode, has been used for all multimode fibers, but one of the below fibers is different in one aspect. What is it?

Correct Answer: OM1 is the only fiber that has a different core size.

4. Multimode fiber with a 50/125-micron core/cladding size became popular when gigabit ethernet was introduced because this fiber size _______.

Correct Answer: All of the above

5. Until the introduction of OM5 fiber, the TIA-568 standard used the designation “OM” to grade all 50/125-micron multimode fiber into OM2, OM3 and OM4 according to the fiber’s _______.

Correct Answer: Bandwidth

6. The higher bandwidth of OM4 fiber allows _______ than with OM3 or OM2 fiber.

Correct Answer: Longer link lengths

7. OM5 fiber was specifically engineered for use with _______.

Correct Answer: Wavelength-division multiplexing with 850–950-nm VCSELs

8. The fastest data links on multimode fiber that use only two fibers—one fiber to transmit and one to receive—run at _______ gigabits per second.

Correct Answer: 10

9. Multimode fiber has only two options for links beyond the speed possible with two fibers, parallel optics with multiple channels at lower speeds on OM3 or OM4 fiber or wavelength-division multiplexing with OM5 fiber.

Correct Answer: True

10. Parallel optics or large fiber count backbones sometimes use a _______ connector that has 12, 24 or more fibers in one connector ferrule.

Correct Answer: MPO