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?
Created by: Jim Hayes
1. Networks that use multimode fiber are generally cheaper because _______.
A. Single-mode fiber is more expensive
B. Premises cable is cheaper than outside plant cable
C. Transceivers for multimode links are cheaper
D. Single-mode fiber is sold in much lower volumes
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.
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?
A. OM1 is the only fiber that has a different core size.
B. OM2 is the only fiber that is laser-optimized.
C. OM3 is the only fiber that has a graded index core.
D. OM4 is the only fiber that is bend-insensitive.
4. Multimode fiber with a 50/125-micron core/cladding size became popular when gigabit ethernet was introduced because this fiber size _______.
A. Has better bandwidth with laser sources
B. Worked with all types of fiber optic sources
C. Was compatible with all ceramic ferrule fiber connectors
D. 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 _______.
A. Core size
B. Attenuation coefficient
D. Numerical aperture
6. The higher bandwidth of OM4 fiber allows _______ than with OM3 or OM2 fiber.
A. More link loss
B. Longer link lengths
C. More connections
D. Better sources
7. OM5 fiber was specifically engineered for use with _______.
A. LED sources at 850 nanometers (nm)
B. Passive optical networks
C. VCSELs (lasers) at 1,310 nm
D. 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.
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.
10. Parallel optics or large fiber count backbones sometimes use a _______ connector that has 12, 24 or more fibers in one connector ferrule.