QUIZ BY JIM HAYES
1. The latest version of TIA-568, version D, dropped two types
of multimode fiber from the list of approved fibers. Which
did the TIA make obsolete? (Pick two.)
2. Which of those fibers was used in practically every
multimode system from the mid-1980s to the end of
3. The advent of the vertical cavity surface emitting laser
(VCSEL) for high-speed multimode fiber systems
essentially made the ________ source obsolete.
A. F-P laser
B. DFB laser
C. HeNe laser
4. With the introduction of the VCSEL, the industry moved
to ________ multimode fiber because it offered higher
bandwidth with laser sources.
5. What is the big specification difference between
OM2, OM3 and OM4 fibers?
D. Core size
6. After the VCSEL was adopted for faster multimode
networks and essentially made LEDs obsolete, testing at
________ nanometers (nm) wavelength became unnecessary.
7. The latest standardized multimode fiber, OM5, is designed
to carry faster network speeds by allowing ________.
A. Higher bandwidth with 850-nm VCSEL sources
B. Higher bandwidth with 1,310-nm laser sources
C. Wavelength division multiplexing with 1,550-nm
D. Wavelength division multiplexing with 850- to
950-nm VCSEL sources
8. Like fiber, faster unshielded twisted-pair (UTP) copper
cabling versions made earlier types obsolete. People refer to
UTP cabling as “Cat 5,” but that cable is effectively obsolete.
9. The TIA has approved the latest version of UTP cabling,
Cat 8, which is intended for use ________.
A. Replacing all earlier versions of UTP cabling
B. As an upgrade for Cat 6 or Cat 6a for 10-gigabit
C. Connecting the latest versions of wireless access points
D. In short links connecting servers and switches in
10. What happens to older cabling components once they are
A. They disappear from stock at distributors
B. Users pull them out and replace them with more
C. Communications systems no longer support them
D. People still buy them to maintain, repair or expand
HA YES is a VDV writer and educator and the president of the Fiber Optic Association. Find him at www. JimHayes.com.
What’s New? What’s Old and Obsolete?
Fiber optics has been around for 40 years; structured cabling for about 25 years. Both have
been used long enough that many older components and processes have become obsolete.
Are you keeping up with the technology? ANSWERS ARE ON PAGE 87. TO TAKE THE QUIZ ELECTRONICALLY,