VDV Testing and Certification 2

Question 1

What does a wiremap test verify in a structured cabling installation?

Accepted Answer

Correct pin-to-pin continuity and absence of miswires

Answer

A wiremap test checks that each conductor connects to the correct pin at both ends and identifies faults like opens, shorts, reversed pairs, and split pairs.

Question 2

Which ANSI/TIA standard defines the minimum performance requirements for field testing of balanced twisted-pair cabling?

Accepted Answer

TIA-568-C.2

Answer

TIA-568-C.2 specifies performance standards and field testing requirements for balanced twisted-pair telecommunications cabling.

Question 3

A technician measures -3 dBm at the end of a fiber run and the source was +2 dBm. What is the link loss?

Accepted Answer

5 dB

Answer

Link loss equals input power minus output power in dBm: +2 dBm − (−3 dBm) = 5 dB total loss.

Question 4

During coaxial cable testing, a return loss of 20 dB is measured. What does this indicate?

Accepted Answer

Acceptable impedance matching with minimal reflections

Answer

A return loss of 20 dB means only 1% of the signal is reflected, indicating good impedance matching in the cable system.

Question 5

What is the purpose of an Optical Time Domain Reflectometer (OTDR) trace in fiber certification?

Accepted Answer

Locate faults and measure splice/connector losses along a fiber link

Answer

An OTDR sends pulses into the fiber and analyzes backscattered light to locate faults, measure attenuation, and evaluate splice and connector losses at specific points.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Testing and Certification 2