Topic 12, Field Testing

Question 1

What is the worst case acceptance value for attenuation when testing 2000 m (6562 ft) of
50/125 multimode fiber at a wavelength of 1300 nm when the fiber has 2 connector pairs and 3 splices?

A. 3.4 dB
B. 4.65 dB
C. 5.4 dB
D. 6.4 dB
E. 9.4 dB

Answer 1

C. 5.4 db

Question 2

You are preparing to test newly installed open office cabling. Within the open office cabling, there are multiple consolidation points (CP) that were installed while waiting for furniture.
How do you proceed with permanent link testing?

A. Test to each CP, then test from CP to workstation.
B. Wait for open office cabling to be completed, then test to each workstation outlet, including the CP.
C. Test that the CP is within 90 meters, then test again to the workstation outlet.
D. Perform permanent link tests to each CP, then continuity tests from CP to each workstation outlet.
E. Test to each workstation outlet, treating each outlet as a channel.

Answer 2

B. Wait for open office cabling to be completed, then test to each workstation outlet, including the CP.

Question 3

Premises optical fiber links should be tested:

A. In one direction at one corresponding wavelength
B. In one direction at both corresponding wavelengths
C. Bidirectionally at one corresponding wavelength
D. Bidirectionally at both corresponding wavelengths

Answer 3

D. Bidirectionally at both corresponding wavelengths

Question 4

Where backbone cabling exceeds cabling lengths for the same performance or design (for product used in horizontal cabling), there are three fundamental tests which should be considered when testing. They are:

A. Insertion loss (attenuation), return loss, and wiremap/strand identification
B. Insertion loss (attenuation), return loss, and continuity
C. Insertion loss (attenuation), return loss, and length
D. Insertion loss (attenuation), continuity, and wiremap/strand identification
E. Continuity, wiremap/strand identification, and propagation delay/delay skew

Answer 4

D. Insertion loss (attenuation), continuity, and wiremap/strand identification

Question 5

When balanced twisted-pair copper cabling, return loss is a measurement of the:

A. Worst case difference in magnitude between the expected insertion loss and the actual measured insertion loss
B. Reflection of signal power resulting from the insertion of a device in a transmission line (in dB)
C. Signal coupling between any two pairs along the entire length of the cabling
D. Loss in signal resulting from the insertion of a component, of link, or channel, between a transmitter and a receiver
E. Time required for a signal to travel from one end of the transmission path to the other end

Answer 5

B. Reflection of signal power resulting from the insertion of a device in a transmission line (in dB)

Question 6

You have been asked to test and troubleshoot an installed base of cabling that is believed to be causing network problems. You are finding that there are high levels of return loss upon initial testing. What testing will best determine the reasons for these failures?

A. Power meter -

B. Continuity testing -

C. Level II testing -
D. Time domain reflectometer (TDR)

Answer 6

D. Time domain reflectometer (TDR)