OSP Fiber Optic & Copper Cabling Systems 5

Question 1

In a DWDM (Dense Wavelength Division Multiplexing) OSP system, the ITU-T G.694.1 grid defines channel spacing at which standard interval?

Accepted Answer

50 GHz or 100 GHz

Answer

ITU-T G.694.1 defines the DWDM frequency grid with standard channel spacings of 12.5, 25, 50, and 100 GHz centered on 193.1 THz.

Question 2

When a fiber cable manufacturer specifies 'cabled fiber attenuation' versus 'uncabled fiber attenuation,' the cabled value is typically:

Accepted Answer

Slightly higher due to microbending induced by cabling materials and process

Answer

Cabling processes can induce microbending stress on fibers, slightly increasing attenuation compared to the bare fiber measurement; this is why manufacturers specify both values.

Question 3

A copper cable's 'characteristic impedance' is important in high-frequency applications because:

Accepted Answer

Mismatched impedance causes signal reflections that degrade performance

Answer

Impedance mismatches at cable terminations or splices cause signal reflections (return loss) that can corrupt data in high-speed copper transmission systems.

Question 4

Which OSP fiber cable type is specifically designed to be directly installed in duct or conduit without requiring a pull rope, due to its low-friction outer jacket?

Accepted Answer

Microduct blown fiber cable

Answer

Microduct blown fiber (air-blown fiber) uses compressed air to float very lightweight fiber bundles through small conduits at high speed without mechanical pulling tension.

Question 5

For outside plant copper cable, what does the term 'loop resistance' mean and what is its significance?

Accepted Answer

The total DC resistance of the two conductors of a pair end-to-end, critical for powering and signaling devices

Answer

Loop resistance is the sum of resistance of both conductors in a pair measured end-to-end, determining whether sufficient current can flow to power devices like telephone instruments or DSL equipment.

(OSP) Outside Plant Designer Practice Test

(OSP) Outside Plant Designer Practice Test

OSP Fiber Optic & Copper Cabling Systems 5