Fiber U Basics 

Lesson #9, Fiber Optic Network Design

FOA Reference Guide To Fiber Optics
And Study Guide To FOA Certification

FOA Reference Guide to Fiber Optics

Answers To Chapter Questions

Chapter 9 Quiz -Design


    1.    ANS:    T
The fiber optic network designer must be familiar with electrical power systems, since the electronic hardware must be provided with high quality uninterruptible power at every location.

    2.    ANS:    F
Before one can begin to design a fiber optic cable plant, one needs to establish with the end user or network owner where the network will be built and what communications signals it will carry.

    3.    ANS:    F
While discussions of which is better – copper, fiber or wireless – has enlivened cabling discussions for decades, it’s becoming moot. Communications technology and the end user market, it seems, have already made decisions that generally dictate the media and many networks combine all three.

    4.    ANS:    T
Most projects start with the choice of a cable. Since OSP applications often use significant lengths of cables, the cables can be made to order, allowing optimization for that particular installation.

    5.    ANS:    T
The process of testing any fiber optic cable plant may require testing three times, testing cable on the reel before installation, testing each segment as it is installed and finally testing complete end to end  loss of every fiber in the cable plant.


    6.    ANS:    D
These are all important areas for the knowledgeable fiber optic network designer.

    7.    ANS:    A
Any communications network must first be considered from the standpoint of the communications it should be transmitting.

    8.    ANS:    D
Fiber optic network design involves all of the above and more!

    9.    ANS:    D
Most building management systems use proprietary copper cabling, for example thermostat wiring and paging/audio speaker systems. Security monitoring and entry systems, certainly the lower cost ones, still depend on copper, although high security  facilities like government and military installations often pay the additional cost for fiber’s more secure nature.

    10.    ANS:    C
As in OSP design, consider the fiber choice first. Most premises networks use multimode fiber, but many users now install hybrid cables with singlemode fibers for future expansion. The 62.5/125 micron fiber (OM1 fiber) that has been used for almost two decades has mostly been superceded by the new 50/125 laser-optimized fiber (OM3), as it offers substantial bandwidth/distance advantages.

    11.    ANS:    B
Documentation of the cable plant is a necessary part of the design and installation process for a fiber optic network that is often overlooked.

    12.    ANS:    D
Documentation is the most helpful thing you can have when trying to troubleshoot a fiber network, especially during restoration.


    13.    ANS:    A, B, C, D
Metropolitan networks owned and operated by cities can carry a variety of traffic, including surveillance cameras, emergency services, educational systems, telephone, LAN, security, traffic monitoring and control and sometimes even traffic for commercial interests using leased bandwidth on dark fibers or city-owned fibers. 

Next: Lesson 10: Fiber Optic Network Installation  
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Table of Contents: The FOA Reference Guide To Fiber Optics

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