DCI Fiber Optic Installation 3

Question 1

A fusion splice typically achieves what maximum average insertion loss?

Accepted Answer

0.1 dB

Answer

A well-executed fusion splice typically achieves 0.1 dB or less of insertion loss, far lower than mechanical splices.

Question 2

What is the purpose of optical fiber gel or index-matching gel in a mechanical splice?

Accepted Answer

To fill the air gap and reduce Fresnel reflection loss

Answer

Index-matching gel has a refractive index close to glass, filling any gap between fiber ends to reduce Fresnel reflection and insertion loss.

Question 3

Which standard defines the insertion loss and return loss specifications for fiber optic connectors used in telecommunications?

Accepted Answer

TIA-568-C.3

Answer

TIA-568-C.3 (now part of TIA-568.3-D) specifies optical fiber cabling components including connector insertion loss and return loss limits.

Question 4

What is the primary difference between OM3 and OM4 multimode fiber?

Accepted Answer

OM4 has higher bandwidth (EMB) supporting longer 10G/40G/100G distances

Answer

OM4 has a higher effective modal bandwidth (EMB) than OM3, extending 10G Ethernet to 550 m and 100G to 150 m versus OM3's shorter distances.

Question 5

When measuring fiber optic link loss with an optical loss test set (OLTS), what does a bidirectional test reveal that a single-direction test does not?

Accepted Answer

Asymmetrical loss from connectors or splices

Answer

Bidirectional testing averages out directional loss differences at connectors, revealing asymmetrical problems that a one-way measurement would hide.

(DCI) Data Cabling Installer Practice Test

(DCI) Data Cabling Installer Practice Test

DCI Fiber Optic Installation 3