VDV Testing and Certification 3

Question 1

What does the term 'Tier 1' testing mean in the context of fiber optic certification per TIA-526-14-B?

Accepted Answer

Insertion loss testing using a light source and power meter

Answer

Tier 1 fiber testing measures insertion loss using a calibrated light source and optical power meter, providing a pass/fail result against the loss budget.

Question 2

When certifying a structured cabling system, what does the 'channel' test configuration include that the 'permanent link' does not?

Accepted Answer

The equipment patch cords at both ends

Answer

The channel includes the horizontal cabling plus up to 10 meters of equipment and work area patch cords, while the permanent link excludes those patch cords.

Question 3

A technician notices that an OTDR trace shows a gain spike at a connector location. What does this likely indicate?

Accepted Answer

A transition from higher-loss to lower-loss fiber (connector appears as a false gain)

Answer

A gain spike (gainer) on an OTDR trace at a connector usually indicates a transition from fiber with higher backscatter coefficient to fiber with lower backscatter, creating a false gain artifact.

Question 4

What is the maximum allowable insertion loss for a single multimode fiber connector per TIA-568-C.3?

Accepted Answer

0.3 dB

Answer

TIA-568-C.3 specifies a maximum of 0.3 dB insertion loss for each mated connector pair in a multimode fiber link.

Question 5

During a VDV certification test, what does a high NEXT (Near-End Crosstalk) value in dB indicate?

Accepted Answer

Good pair isolation with minimal interference

Answer

NEXT is measured as a loss figure, so a higher dB value means more attenuation of the crosstalk signal, indicating better isolation and less interference.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Testing and Certification 3