RCDD Chapter 13 Private Catv Distribution System
Registered Communications Distribution Designer (RCDD)
Questions and Answers
- 1.
A two way splitter divides a signal evenly while maintaining a _______ impedance.
- A.
50 ohm
- B.
65 ohm
- C.
75 ohm
- D.
100 ohm
Correct Answer
C. 75 ohmExplanation
A two-way splitter is a device used to divide a signal into two equal parts. In order for the signal to be divided evenly, the splitter needs to have the same impedance as the source and the load. The correct answer of 75 ohm indicates that the splitter maintains a 75 ohm impedance, which ensures that the signal is divided evenly without any loss or distortion.Rate this question:
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- 2.
Proof of performance testing involves what two steps:
- A.
Aligning/balancing the system
- B.
Signal ingress
- C.
Determining system loss
- D.
Testing the system and its components
Correct Answer(s)
A. Aligning/balancing the system
D. Testing the system and its componentsExplanation
The proof of performance testing involves two steps: aligning/balancing the system and testing the system and its components. Aligning/balancing the system ensures that all the components are properly calibrated and functioning together optimally. Testing the system and its components involves evaluating the performance and functionality of the system to ensure it meets the desired specifications and requirements. These two steps are crucial in validating the performance and reliability of the system.Rate this question:
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- 3.
What is the loss for Series 11 coaxial type cable at 450 MHz
- A.
1.25 dB
- B.
1.97 dB
- C.
2.50 dB
- D.
2.75 dB
Correct Answer
D. 2.75 dBExplanation
The loss for Series 11 coaxial type cable at 450 MHz is 2.75 dB.Rate this question:
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- 4.
What device divides a signal evenly while maintaining a 75 ohm impedance:
- A.
Two-way splitter
- B.
Multiport tap
- C.
Directional coupler
- D.
Combiner
Correct Answer
A. Two-way splitterExplanation
A two-way splitter is a device that divides a signal evenly while maintaining a 75 ohm impedance. This means that when a signal is inputted into the splitter, it will be divided into two equal parts, each with a 75 ohm impedance. This is useful in situations where a signal needs to be distributed to multiple devices or locations without any loss or distortion.Rate this question:
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- 5.
What device has several inputs and a single output.
- A.
Splitter
- B.
Directional coupler
- C.
Multiport tap
- D.
Combiner
Correct Answer
D. CombinerExplanation
A combiner is a device that has several inputs and a single output. It is used to combine multiple signals or inputs into a single output. This can be useful in various applications such as in audio systems, where multiple microphones need to be combined into a single output, or in telecommunication systems, where multiple signals from different sources need to be combined and transmitted through a single channel.Rate this question:
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- 6.
What device is a splitter with uneven outputs:
- A.
Two-way splitter
- B.
Directional coupler
- C.
Multiport tap
- D.
Combiner
Correct Answer
B. Directional couplerExplanation
A directional coupler is a device that splits the input signal into two outputs with uneven power distribution. It is designed to allow power to flow in one direction while minimizing the power that is reflected back to the source. This makes it suitable for applications where signal isolation and power division are required, such as in RF and microwave systems. Unlike a two-way splitter or a combiner, a directional coupler has an uneven power split between its outputs, making it the correct answer for a splitter with uneven outputs.Rate this question:
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- 7.
A typical cable system consists of what three basic elements:
- A.
Entrance facility (EF)
- B.
Headend
- C.
Distribution system
- D.
Design system
- E.
Subscriber drop
Correct Answer(s)
B. Headend
C. Distribution system
E. Subscriber dropExplanation
A typical cable system consists of three basic elements: the headend, the distribution system, and the subscriber drop. The headend is the central hub where signals are received and processed before being distributed to subscribers. The distribution system is responsible for transmitting the signals from the headend to the subscribers' homes or businesses. The subscriber drop refers to the physical connection between the distribution system and the individual subscriber's premises, allowing them to receive the cable services.Rate this question:
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- 8.
What are the two basic topologies used in private CATV distribution systems:
- A.
Lay in
- B.
Home run
- C.
Bus
- D.
Trunk and tap
Correct Answer(s)
B. Home run
D. Trunk and tapExplanation
The two basic topologies used in private CATV distribution systems are home run and trunk and tap. In a home run topology, each cable from the headend is connected directly to the subscriber's location, providing a dedicated line for each subscriber. This allows for better signal quality and easier troubleshooting. In a trunk and tap topology, a main trunk cable runs from the headend to a distribution point, where it is tapped to provide connections to multiple subscribers. This allows for more efficient use of cable and is suitable for larger networks with multiple subscribers.Rate this question:
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- 9.
Which topology is usually the least expensive way to serve an area.
- A.
Home run
- B.
Trunk and Tap
Correct Answer
B. Trunk and TapExplanation
Trunk and Tap is usually the least expensive way to serve an area because it involves connecting multiple devices in a linear fashion, with each device connected to a central trunk line. This eliminates the need for additional equipment and wiring, reducing costs. Additionally, it allows for easy expansion and troubleshooting as each device can be individually accessed and tested. On the other hand, Home run topology requires each device to have its own dedicated line, resulting in increased wiring and equipment costs.Rate this question:
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- 10.
Most cable loss values are based on a temperature of:
- A.
10 degrees C (45 degrees F)
- B.
15 degrees C (60 degrees F)
- C.
20 degrees C (68 degrees F)
- D.
25 degrees C (74 degrees F)
Correct Answer
C. 20 degrees C (68 degrees F)Explanation
Most cable loss values are based on a temperature of 20 degrees C (68 degrees F). This means that the calculations and measurements of cable loss are typically done assuming a temperature of 20 degrees C. Cable loss is the reduction in signal strength as it travels through a cable, and it is affected by factors such as temperature. By using a standard temperature of 20 degrees C, it allows for consistent and accurate comparisons between different cables and systems.Rate this question:
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- 11.
What is the loss for a series 11 coaxial cable at 55 MHz:
- A.
0.50 dB
- B.
0.74 dB
- C.
0.83 dB
- D.
0.96 dB
Correct Answer
D. 0.96 dBExplanation
The loss for a series 11 coaxial cable at 55 MHz is 0.96 dB. This means that the cable will experience a loss of 0.96 decibels per unit length at this frequency. This loss is due to various factors such as resistance, dielectric losses, and radiation losses. The higher the loss, the weaker the signal will be when it reaches the destination.Rate this question:
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- 12.
What are two factors that must be considered when calculating losses in designing a network:
- A.
Connector loss
- B.
Cable loss
- C.
Receiver loss
- D.
Device loss
- E.
Transmitter loss
Correct Answer(s)
B. Cable loss
D. Device lossExplanation
When designing a network, two factors that must be considered when calculating losses are cable loss and device loss. Cable loss refers to the reduction in signal strength that occurs as the signal travels through the cables used in the network. Device loss, on the other hand, refers to the decrease in signal strength that occurs as the signal passes through various network devices such as switches, routers, or repeaters. Both cable loss and device loss can significantly impact the overall performance and efficiency of the network, so they need to be taken into account during the design process.Rate this question:
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- 13.
In horizontal telecommunications cabling, the home run design is called a ________ topology.
- A.
Hierarchial star
- B.
Star
- C.
Bus
- D.
Ring
Correct Answer
B. StarExplanation
The correct answer is "Star." In horizontal telecommunications cabling, the home run design refers to a configuration where each network device has its own dedicated cable that runs directly back to a central point, such as a network switch or patch panel. This central point acts as the hub of the network, with all cables connecting to it in a star-like pattern. This design provides better performance, flexibility, and ease of troubleshooting compared to other topologies like bus or ring.Rate this question:
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- 14.
A two way splitter results in an approximate signal loss of _____.
- A.
2 dB
- B.
3 dB
- C.
5 dB
- D.
10 dB
Correct Answer
B. 3 dBExplanation
A two-way splitter results in an approximate signal loss of 3 dB. This means that the signal strength is reduced by 3 decibels when it is split into two separate paths. The signal loss is necessary to distribute the signal equally between the two paths, ensuring that each path receives a similar signal strength.Rate this question:
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