# RCDD Chapter 1 Principles Of Transmission

175 Questions | Total Attempts: 27  Settings  Registered Communications Distribution Designer (RCDD)

• 1.
WDM uses a series of lenses to refract and direct light pulses into a single optical fiber that carries the combined wavelengths
• A.

True

• B.

False

• 2.
What are the two types of attenuators
• A.

Fixed

• B.

Random

• C.

Variable

• D.

• 3.
Loss variations due to temperature changes can sometimes be as high as
• A.

1 dB/km

• B.

2 dB/km

• C.

3 dB/km

• D.

4 dB/km

• 4.
Wavelength areas that are most suitable for optical communications are called:
• A.

Spectrums

• B.

Windows

• C.

Layers

• D.

Stacks

• 5.
The outer most part of a fiber is called the cladding
• A.

True

• B.

False

• 6.
Visible light wavelength is:
• A.

200-400 nm

• B.

300-700 nm

• C.

400-700 nm

• D.

500-800 nm

• 7.
The bandwidth of a multimode system is a function of:
• A.

Chloric dispersion

• B.

Chromatic dispersion

• C.

Medial dispersion

• D.

Modal dispersion

• 8.
Bandwidth is the information carrying capacity of a system.
• A.

True

• B.

False

• 9.
What is the numerical aperture of 62.5/125 fiber
• A.

0.20

• B.

0.25

• C.

0.275

• D.

.030

• 10.
What is the center wavelength for a CD laser
• A.

850 nm

• B.

780 nm

• C.

1300 nm

• D.

1310 nm

• E.

1550 nm

• 11.
What is the numerical aperture of 50/125 fiber:
• A.

0.20

• B.

0.250

• C.

0.275

• D.

0.30

• 12.
Mutual conductance G(line) is expressed in
• A.

Siemens (S)

• B.

Ohms

• C.

Henrys (H)

• D.

• 13.
A higher attenuation number is better
• A.

True

• B.

False

• 14.
Attenuation to Crosstalk ratio (ACR) is calculated how:
• A.

• B.

Minimum NEXT loss - maximum attenuation

• C.

Maximum attenuation - minimum NEXT loss

• 15.
NEXT loss is dominated by components in the near zone, what is defined as the near zone:
• A.

• B.

• C.

• D.

• 16.
The mutual capacitance C(line) is expresssed in
• A.

Henrys (H)

• B.

• C.

Ohms

• D.

Siemans (S)

• 17.
The series resistance R(line) is expressed in:
• A.

Watts

• B.

Ohms

• C.

Amps

• D.

Volts

• 18.
The series inductance L(line) is expressed in:
• A.

Ohms

• B.

Henrys (H)

• C.

• D.

Siemens (S)

• 19.
What is the rate for ATM (STS-3)
• A.

12.96 Mb/s

• B.

25.6 Mb/s

• C.

51.8 Mb/s

• D.

155 Mb/s

• 20.
DS-1C systems are no longer being deployed.
• A.

True

• B.

False

• 21.
Good internet performance requires a down-to-upstream ratio of at least:
• A.

2:1

• B.

5:1

• C.

10:1

• D.

15:1

• 22.
What is the rate for ATM (STS-1)
• A.

12.96 Mb/s

• B.

25.6 Mb/s

• C.

51.8 Mb/s

• D.

155 Mb/s

• 23.
The rate at which the digital signal state changes and the bit transmission rate are the same
• A.

True

• B.

False

• 24.
When converting digital data to digital signals, what are the two common methods of encoding:
• A.

Manchester

• B.

Winchester

• C.

Alternate mark inversion (AMI)

• D.

Alternate bit inversion (ABI)

• 25.
The bit is the basic unit of digital data
• A.

True

• B.

False

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