# RCDD Chapter 5 Backbone Distribution Systems

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Registered Communications Distribution Designer (RCDD)

• 1.

### Cable manufactured with fiberglass rods or aramid yarn are known as what?

• A.

Singlemode cables

• B.

Multimode cables

• C.

All-dielectric cables

• D.

Tight-buffered cables

• E.

Loose-tube cables

C. All-dielectric cables
Explanation
All-dielectric cables are manufactured using fiberglass rods or aramid yarn. These cables do not contain any metallic elements, making them suitable for use in areas with high electrical interference or where grounding is not possible. They provide excellent insulation and are resistant to electromagnetic interference. All-dielectric cables are commonly used in outdoor installations, such as aerial or underground applications, where they offer high durability and protection against environmental factors.

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• 2.

### Nonconductive backbone optical fiber cables shall have a minimum bend radius of ___ times the cable's outside diameter when under no load and ___ times the cable's outside diameter when being pulled.

• A.

5,10

• B.

10,15

• C.

6,12

• D.

2,3

B. 10,15
Explanation
Nonconductive backbone optical fiber cables must be handled with care to avoid damaging the delicate fibers inside. The minimum bend radius refers to the smallest radius that the cable can be bent without causing signal loss or physical damage. When the cable is not under any load, it should have a minimum bend radius of 10 times its outside diameter. However, when the cable is being pulled, it is subjected to more stress, so the minimum bend radius increases to 15 times its outside diameter to prevent any damage to the fibers.

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• 3.

### Conductive backbone optical fiber cables shall have a minimum bend radius of ____ times the cable's outside diameter when under no load and ____ times the cable's outside diameter when being pulled.

• A.

10,15

• B.

5,10

• C.

10,30

• D.

10,20

D. 10,20
Explanation
Conductive backbone optical fiber cables need to maintain a minimum bend radius to ensure optimal performance and prevent damage. When the cable is not under any load, the minimum bend radius should be 10 times the cable's outside diameter. However, when the cable is being pulled, the minimum bend radius should be increased to 20 times the cable's outside diameter. This is necessary to prevent excessive stress on the cable and maintain its integrity during installation or movement.

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• 4.

### What are the basic methods to terminate optical fiber cables?

• A.

Pigtail splicing

• B.

Field connectorizing

• C.

Installation of preconnectorized assemblies

• D.

All the above

D. All the above
Explanation
The correct answer is "All the above" because all three methods mentioned - pigtail splicing, field connectorizing, and installation of preconnectorized assemblies - are commonly used to terminate optical fiber cables. Pigtail splicing involves splicing a pigtail cable to the main cable, field connectorizing involves connecting connectors directly to the main cable in the field, and installation of preconnectorized assemblies involves using pre-made assemblies with connectors already attached. All of these methods can be used depending on the specific requirements and circumstances of the fiber optic installation.

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• 5.

### An optical fiber pigtail is an optical fiber cable that is:

• A.

Factory-connectorized on one end with an optical fiber connector

• B.

Orange

• C.

Yellow

• D.

Unterminated at the other end.

A. Factory-connectorized on one end with an optical fiber connector
D. Unterminated at the other end.
Explanation
An optical fiber pigtail is a type of optical fiber cable that is pre-connectorized on one end with an optical fiber connector, making it ready to be easily connected to other optical devices. The other end of the pigtail is left unterminated, which means it does not have a connector attached to it. This allows the user to customize the pigtail by adding the desired connector or terminating it according to their specific needs. The color of the pigtail, whether orange or yellow, is not relevant to its definition or functionality.

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• 6.

### Conductive optical fiber plenum cable = what fiber cable marking

• A.

OFNP

• B.

OFCP

• C.

OFNR

• D.

OFCR

• E.

OFN, OFNG

B. OFCP
Explanation
The correct answer is OFCP. OFCP stands for Optical Fiber Cable Plenum, which indicates that the cable is suitable for installation in plenum spaces, which are areas in buildings used for air circulation. Plenum spaces require cables with fire-resistant and low-smoke properties to prevent the spread of fire and toxic fumes. OFCP cables meet these requirements and are commonly used in commercial buildings. OFNP, OFNR, OFCR, OFN, and OFNG are also fiber cable markings, but they do not specifically indicate suitability for plenum spaces.

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• 7.

### Nonconductive optical fiber riser cable = what cable marking?

• A.

OFNP

• B.

OFCP

• C.

OFNR

• D.

OFCR

• E.

OFN,OFNG

C. OFNR
Explanation
OFNR stands for Optical Fiber Nonconductive Riser. This cable marking indicates that the cable is suitable for vertical installations in buildings, such as between floors, where fire regulations require a nonconductive cable. OFNR cables have fire-resistant jackets and are designed to limit the spread of fire and smoke.

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• 8.

### Nonconductive optical fiber plenum cable = what fiber cable marking?

• A.

OFNP

• B.

OFCP

• C.

OFNR

• D.

OFCR

• E.

OFN,OFNG

A. OFNP
Explanation
The correct answer is OFNP. Nonconductive optical fiber plenum cable is marked as OFNP. Plenum cables are designed to be used in plenum spaces, which are areas in a building used for air circulation, such as the space above a drop ceiling or below a raised floor. OFNP cables have a nonconductive jacket that does not emit toxic fumes when exposed to fire, making them suitable for plenum spaces where fire safety regulations are strict. OFCP, OFNR, OFCR, OFN, and OFNG are other types of fiber cable markings, but they do not specifically indicate nonconductive plenum cables.

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• 9.

### Conductive optical fiber riser cable = what cable marking?

• A.

OFNP

• B.

OFCP

• C.

OFNR

• D.

OFCR

• E.

OFN,OFNG

D. OFCR
Explanation
The correct answer is OFCR. OFCR stands for "Optical Fiber Cable Riser" and is a cable marking used for conductive optical fiber riser cables. This marking indicates that the cable is suitable for vertical runs between floors in a building. OFCR cables have fire-resistant properties and are designed to prevent the spread of fire from one floor to another.

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• 10.

### Nonconductive optical fiber cable = what cable markings?

• A.

OFNP

• B.

OFCP

• C.

OFNR

• D.

OFCR

• E.

OFN, OFNG

E. OFN, OFNG
Explanation
The correct answer is OFN, OFNG. OFN stands for Optical Fiber Nonconductive and OFNG stands for Optical Fiber Nonconductive General-purpose. These cable markings indicate that the optical fiber cable is nonconductive, meaning it does not conduct electricity. This is important for safety purposes, as it reduces the risk of electrical hazards when installing or using the cable.

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• 11.

### Conductive optical fiber cable = what cable markings

• A.

OFCP

• B.

OFNR

• C.

OFCR

• D.

OFN, OFNG

• E.

OFC, OFCG

E. OFC, OFCG
Explanation
The correct answer is OFC, OFCG. OFC stands for Optical Fiber Cable and OFCG stands for Optical Fiber Cable, General Purpose. These cable markings indicate that the cable is conductive, meaning it has a conductive layer or component that helps to dissipate static electricity and prevent damage to the fiber optic components. Conductive optical fiber cables are commonly used in environments where there is a risk of static electricity buildup, such as in industrial settings or areas with high electrical interference.

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• 12.

### OPTICAL FIBER CABLE SUBSTITUTIONS FOR OFNP ARE ?

• A.

OFNP

• B.

OFNP

• C.

OFNR, OFCP, OFNP

• D.

OFNR, OFNP

• E.

NONE

E. NONE
Explanation
The correct answer is NONE because there are no substitutions for OFNP optical fiber cable. OFNP stands for Optical Fiber Nonconductive Plenum, which is a type of cable specifically designed for use in plenum spaces, such as the area above a drop ceiling or below a raised floor, where air circulation for heating and cooling systems occurs. OFNP cables have fire-resistant properties and are made with materials that do not emit toxic fumes when exposed to heat or fire. Therefore, there are no alternative cable types that can be used as substitutions for OFNP.

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• 13.

### OPTICAL FIBER CABLE SUBSTITUTIONS FOR OFCP ARE ?

• A.

NONE

• B.

OFNR, OFCP, OFNP

• C.

OFNP

C. OFNP
Explanation
OFNP stands for Optical Fiber Nonconductive Plenum, which is a type of optical fiber cable specifically designed for use in plenum spaces, such as the open spaces above drop ceilings or under raised floors, where air circulation for heating, ventilation, and air conditioning (HVAC) systems occurs. OFNP cables have fire-resistant and low-smoke properties, making them suitable for installation in plenum areas. Therefore, OFNP is a valid substitution for OFCP (Optical Fiber Cable Plenum), which is another type of cable designed for plenum spaces. The other options, NONE and OFNR, are not suitable substitutions for OFCP.

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• 14.

### OPTICAL FIBER CABLE SUBSTITUTIONS FOR OFNR ARE ?

• A.

NONE

• B.

OFNG, OFN, OFCR, OFNR, OFCP, OFNP

• C.

OFNP

• D.

OFNR, OFCP, OFNP

C. OFNP
Explanation
The correct answer is OFNP. OFNP stands for Optical Fiber Nonconductive Plenum, which is a type of optical fiber cable that is suitable for installation in plenum spaces, such as the area above a drop ceiling or below a raised floor, where air circulation is necessary for heating, ventilation, and air conditioning systems. OFNP cables have fire-resistant and low-smoke properties, making them safe for use in plenum spaces.

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• 15.

### OPTICAL FIBER CABLE SUBSTITUTIONS FOR OFCR ARE?

• A.

NONE

• B.

OFNP

• C.

OFNG, OFN, OFCR, OFNR, OFCP, OFNP

• D.

OFNR, OFCP, OFNP

• E.

OFNR, OFNP

D. OFNR, OFCP, OFNP
Explanation
The correct answer is OFNR, OFCP, OFNP. This means that OFNR, OFCP, and OFNP can be used as substitutions for OFCR in optical fiber cables.

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• 16.

### OPTICAL FIBER CABLE SUBSTITUTIONS FOR OFN, OFNG ARE?

• A.

OFNG, OFN, OFCR, OFNR, OFCP, OFNP

• B.

OFNP

• C.

OFNR, OFNP

• D.

OFNP

C. OFNR, OFNP
Explanation
OFNR and OFNP are the correct optical fiber cable substitutions for OFN and OFNG. OFNR stands for Optical Fiber Nonconductive Riser, which is suitable for vertical riser applications. OFNP stands for Optical Fiber Nonconductive Plenum, which is suitable for plenum spaces such as air handling ducts. These cable types have specific fire safety ratings and insulation properties that make them appropriate for different installation environments.

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• 17.

### OPTICAL FIBER CABLE SUBSTITUTIONS FOR OFC, OFCG ARE?

• A.

OFNP

• B.

OFNR, OFNP

• C.

OFNG, OFN, OFCR, OFNR, OFCP, OFNP

• D.

OFNR, OFNP

C. OFNG, OFN, OFCR, OFNR, OFCP, OFNP
Explanation
The correct answer is OFNG, OFN, OFCR, OFNR, OFCP, OFNP. These are the possible substitutions for optical fiber cables (OFC) and optical fiber cables for general use (OFG). OFNG stands for optical fiber cables for general use, OFN stands for optical fiber cables for non-conductive environments, OFCR stands for optical fiber cables for conductive environments, OFNR stands for optical fiber cables for non-conductive riser, OFCP stands for optical fiber cables for conductive plenum, and OFNP stands for optical fiber cables for non-conductive plenum. These substitutions provide different cable options for various environments and requirements.

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• 18.

### BALANCED TWISTED-PAIR CABLE MARKINGS FOR COMMUNICATIONS PLENUM CABLE ARE ?

• A.

CMP

• B.

CMR

• C.

CM, CMG

• D.

CMX LIMITED USE

• E.

CMUC

A. CMP
Explanation
The correct answer is CMP. CMP stands for Communications Plenum Cable, which is a type of balanced twisted-pair cable used in plenum spaces, which are areas in a building used for air circulation. These cables have a special fire-resistant jacket that meets the safety requirements for plenum spaces. CMR, CM, CMG, CMX LIMITED USE, and CMUC are not the correct markings for communications plenum cable.

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• 19.

### BALANCED TWISTED-PAIR CABLE MARKINGS FOR COMMUNICATIONS RISER CABLE ARE?

• A.

CMX, LIMITED USE

• B.

CMP

• C.

CM, CMG

• D.

CMUC

• E.

CMR

E. CMR
Explanation
The correct answer is CMR. CMR stands for Communications Riser and is a marking used for balanced twisted-pair cables that are suitable for vertical runs in a building's riser shaft or between floors. It indicates that the cable has a higher fire resistance rating and is designed to prevent the spread of fire between floors.

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• 20.

### BALANCED TWISTED-PAIR CABLE MARKINGS FOR COMMUNICATIONS CABLE ARE?

• A.

CMP

• B.

CMUC

• C.

CMX, LIMITED USE

• D.

CM, CMG

• E.

CMR

D. CM, CMG
Explanation
The correct answer is CM, CMG. CM and CMG are markings used for balanced twisted-pair cables in communication systems. CM stands for "communication" and CMG stands for "communication general." These markings indicate that the cables are suitable for general communication purposes and meet the necessary safety and performance standards.

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• 21.

### BALANCED TWISTED-PAIR CABLE MARKINGS FOR COMMUNICATIONS LIMITED USE CABLE ARE?

• A.

CMUC

• B.

CMX, LIMITED USE

• C.

CMP

• D.

CM, CMG

• E.

CMR

B. CMX, LIMITED USE
Explanation
The correct answer is CMX, LIMITED USE. This marking indicates that the cable is a balanced twisted-pair cable and is suitable for limited use in communications. The "CMX" marking signifies that the cable meets the requirements for general-purpose communications use, while the "LIMITED USE" designation indicates that it is not intended for long-distance or high-performance applications.

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• 22.

### BALANCED TWISTED-PAIR CABLE MARKINGS FOR COMMUNICATIONS UNDERCARPET CABLE ARE?

• A.

CMP

• B.

CMR

• C.

CM, CMG

• D.

CMX, LIMITED USE

• E.

CMUC

E. CMUC
Explanation
The correct answer for this question is CMUC. CMUC stands for "Communications Undercarpet Cable" and is used to mark balanced twisted-pair cables specifically designed for undercarpet installations. This marking ensures that the cable meets the necessary standards and is suitable for use in this specific application.

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• 23.

### WHAT IS THE PERMITTED SUBSTITUTIONS FOR CMR CABLE TYPE?

• A.

CMP, CMR

• B.

CMP, CMR, CM, CMG

A. CMP, CMR
Explanation
The permitted substitutions for CMR cable type are CMP and CMR.

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• 24.

### In some cases, horizontal optical fibers may be extended through backbone pathways.  However, this may not be possible because the horizontal cables may what?

• A.

May need to be rated for riser use (in some areas)

• B.

Much more costly to install

• C.

Can take up too much space in the backbone pathway.

A. May need to be rated for riser use (in some areas)
C. Can take up too much space in the backbone pathway.
Explanation
Horizontal optical fibers are typically used to connect individual workstations or devices to the main network backbone. However, in some cases, these fibers may need to be extended through backbone pathways to reach their destination. This extension may not be possible because the horizontal cables may need to be rated for riser use in certain areas, meaning they have to meet specific fire safety standards. Additionally, the horizontal fibers can take up too much space in the backbone pathway, causing congestion and potential performance issues. Therefore, these factors may prevent the extension of horizontal optical fibers through backbone pathways.

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• 25.

### WHAT IS THE PERMITTED SUBSTITUTIONS FOR CMX CABLE TYPE?

• A.

CMP, CMR

• B.

CMP, CMR, CM, CMG

B. CMP, CMR, CM, CMG
Explanation
The permitted substitutions for CMX cable type are CMP, CMR, CM, and CMG. This means that any of these cable types can be used as a substitute for CMX cable type.

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• 26.

### A backbone system consists of: cable pathways, ER's, and TR's.  What are some of the other components?

• A.

TE's

• B.

EF's

• C.

Transmission media

• D.

Miscellaneous

• E.

All the above

E. All the above
Explanation
The backbone system consists of various components such as cable pathways, ER's (Equipment Rooms), TR's (Telecommunication Rooms), TE's (Telecommunication Enclosures), EF's (Equipment Frames), transmission media, and miscellaneous elements. These components work together to provide a robust and efficient communication infrastructure.

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• 27.

### Bridge and Taps are usually permitted as part of the building backbone cabling.

• A.

True

• B.

False

B. False
Explanation
Bridge and Taps are not usually permitted as part of the building backbone cabling. This is because bridge and taps are typically used in distribution cabling, which connects the building backbone cabling to individual work areas. The building backbone cabling, on the other hand, is responsible for connecting equipment rooms, telecommunications closets, and entrance facilities within a building. Therefore, bridge and taps are not typically allowed in the building backbone cabling.

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• 28.

### The MC (CD) should be close to (if not located in) the main TR.

• A.

True

• B.

False

B. False
Explanation
The MC (CD) should not necessarily be close to or located in the main TR. The MC (CD) stands for the main control (control desk), which is typically the central location where control operations are carried out. However, it is not a requirement for the MC (CD) to be physically close to the main TR (transmitter). The main TR could be located in a different area or even a different building altogether. Therefore, the statement is false.

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• 29.

### The design of a building backbone between the building cross-connect (main or intermediate) and the HC (FD) is usually straightforward, though various options sometimes exist.  The two primary options are the:

• A.

Star, where the HC (FD) is connected directly to the IC (BD)

• B.

Star, wher the HC (FD) is connected directly to the MC (CD)

• C.

Hierarchical star, where some or all of the HCs (FD) are connected to an IC (BD), which in turn is connected to the MC (CD)

• D.

Physical star, where some or all of the HCs (FD) are connected to an IC (BD), which in turn is connected to the MC (CD)

B. Star, wher the HC (FD) is connected directly to the MC (CD)
C. Hierarchical star, where some or all of the HCs (FD) are connected to an IC (BD), which in turn is connected to the MC (CD)
Explanation
The correct answer is a combination of two options: "Star, where the HC (FD) is connected directly to the MC (CD)" and "Hierarchical star, where some or all of the HCs (FD) are connected to an IC (BD), which in turn is connected to the MC (CD)". This suggests that the design of a building backbone can be either a simple star configuration where the HC (FD) is directly connected to the MC (CD), or a hierarchical star configuration where some or all of the HCs (FD) are connected to an IC (BD), which is then connected to the MC (CD). These options provide flexibility in designing the building backbone based on the specific requirements and layout of the building.

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• 30.

### You should avoid direct connections between HCs (FDs)

• A.

True

• B.

False

A. True
Explanation
Direct connections between HCs (functional dependencies) should be avoided because it can lead to redundancy and inconsistency in the database. When there are direct connections between HCs, it means that the dependencies are not properly normalized, and updates or modifications to the data can result in inconsistencies. By avoiding direct connections, we can ensure that the database is properly normalized and minimize the chances of redundancy and inconsistency.

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• 31.

### Often the most cost-effective transmission medium for data systems is?

• A.

Optical fiber

• B.

Balanced twist pair

• C.

Coaxial cable

A. Optical fiber
Explanation
Optical fiber is often the most cost-effective transmission medium for data systems because it offers several advantages. Firstly, optical fiber has a high bandwidth capacity, allowing for faster data transmission compared to other mediums. Additionally, it has low signal loss over long distances, making it suitable for long-haul transmissions. Optical fiber is also immune to electromagnetic interference, ensuring reliable data transmission. Furthermore, it is lightweight and compact, making it easy to install and maintain. Overall, these factors contribute to optical fiber being a cost-effective choice for data transmission.

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• 32.

### Often the most cost-effective transmission medium for voice systems are what?

• A.

Optical fiber

• B.

Unbalanced twist pair

• C.

Balanced twist pair

• D.

Coaxial cable

• E.

Balanced twist pair and optical fiber where remote switches are deployed.

E. Balanced twist pair and optical fiber where remote switches are deployed.
Explanation
The most cost-effective transmission medium for voice systems is a combination of balanced twist pair and optical fiber, especially when remote switches are deployed. This combination allows for efficient and reliable transmission of voice signals while also being cost-effective. Optical fiber is known for its high bandwidth and low signal loss, making it ideal for long-distance transmission. On the other hand, balanced twist pair cables provide good noise rejection and are commonly used for short-distance communication. By utilizing both mediums, voice systems can achieve optimal performance and cost efficiency.

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• 33.

### To ensure that the backbone cabling can accommodate the voice and data transmission protocols that are deployed by the customer, the designer should consider what three things?

• A.

Length of the backbone segments

• B.

Type of media used

• C.

The customer's voice and data networking equipment

• D.

Cost of the installation

• E.

Location the backbone will be installed.

A. Length of the backbone segments
B. Type of media used
C. The customer's voice and data networking equipment
Explanation
The designer needs to consider the length of the backbone segments to ensure that the cabling can effectively transmit voice and data protocols without any signal degradation. They also need to consider the type of media used, as different media have different bandwidth capabilities and transmission characteristics. Additionally, the customer's voice and data networking equipment need to be taken into account to ensure compatibility and optimal performance. The cost of the installation and the location where the backbone will be installed are not directly related to accommodating the transmission protocols and therefore are not relevant considerations in this context.

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• 34.

### The length of the equipment cable used to connect telecommunications equipment directly to the MC (CD or IC (BD) should not exceed what?

• A.

21 m (71 ft)

• B.

10 m (33 ft)

• C.

30 m (98 ft)

• D.

95 M (295 ft)

C. 30 m (98 ft)
Explanation
The correct answer is 30 m (98 ft) because exceeding this length can result in signal loss and degradation. To ensure optimal performance, it is important to keep the cable length within this limit when connecting telecommunications equipment directly to the MC (CD or IC (BD).

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• 35.

### The choice of transmission media may depend upon the application.  What are the factors to be considered ?

• A.

Flexibility of the medium with respect to supported services

• B.

Required useful lime of the backbone cabling

• C.

Site size and user population

• D.

All the above

D. All the above
Explanation
The choice of transmission media depends on several factors. One factor is the flexibility of the medium in terms of the services it can support. Different applications may require different types of transmission media. Another factor is the required useful life of the backbone cabling, as some transmission media may have a longer lifespan than others. Additionally, the size of the site and the number of users also play a role in determining the appropriate transmission media. Therefore, all of the factors mentioned above need to be considered when choosing the transmission media.

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• 36.

### When necessary you my place backbone cable pathways in elevator shafts.

• A.

True

• B.

False

B. False
Explanation
Placing backbone cable pathways in elevator shafts is not recommended. Elevator shafts are high-risk areas with constant movement and potential for damage to the cables. Additionally, the electromagnetic interference from the elevator machinery can negatively affect the performance of the cables. It is advisable to choose safer and more suitable locations for backbone cable pathways.

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• 37.

### The location and configuration of hte slots shall be approved by a structural engineer.

• A.

True

• B.

False

A. True
Explanation
The statement is true because the location and configuration of slots in a structure can have a significant impact on its structural integrity. A structural engineer is trained to analyze and assess the design of a structure, including the placement and arrangement of slots, to ensure that it can safely support the loads it will be subjected to. By approving the location and configuration of slots, a structural engineer helps to ensure that the structure will be structurally sound and meet the necessary safety standards.

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• 38.

### The slot area should be increased by .46m sq (60ft sq) with each 4000 m sq (40000 ft sq) increase in usable floor space served by that backbone.

• A.

True

• B.

False

A. True
Explanation
The statement implies that as the usable floor space served by the backbone increases by 4000 m sq (40000 ft sq), the slot area should be increased by .46m sq (60ft sq). This indicates a positive correlation between the usable floor space and the required slot area. Therefore, the answer "True" suggests that increasing the usable floor space served by the backbone necessitates an increase in the slot area.

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• 39.

### Rack-mounted hardware is instlled in standard _____ or _____ racks or cabinets?

• A.

19 in or 24 in

• B.

18 in or 23 in

• C.

19 in or 23 in

• D.

19 in or 26 in

C. 19 in or 23 in
Explanation
Rack-mounted hardware is installed in standard 19 in or 23 in racks or cabinets. These dimensions refer to the width of the rack or cabinet, which is standardized in the IT industry. The 19 in measurement is commonly used for server racks and network equipment, while the 23 in measurement is often used for telecom equipment. The standardization allows for easy installation and compatibility between different hardware components.

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• 40.

### The recommended balanced twisted-pair cable for building backbone consists of 24 AWG or up to 20 AWG round, solid copper conductors with a nominal characteristic impedance of 100 ohm.

• A.

True

• B.

False

B. False
Explanation
The statement is false because the recommended balanced twisted-pair cable for building backbone typically consists of 22 AWG or larger conductors, not 24 AWG or up to 20 AWG as stated in the statement. Additionally, the nominal characteristic impedance for building backbone cables is usually 120 ohms, not 100 ohms.

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• 41.

### Typical multiplexers support how many ports?

• A.

12-24

• B.

24-36

• C.

24-32

• D.

12-32

• E.

12-36

C. 24-32
Explanation
A typical multiplexer supports 24-32 ports. This means that it can handle input from 24 to 32 different sources and route them to a single output. Multiplexers are commonly used in telecommunications and digital systems to combine multiple signals into a single transmission line or device. The range of 24-32 ports indicates the flexibility and capacity of the multiplexer to handle a substantial number of inputs.

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• 42.

### Large multiplex systems may support up to ____ports?

• A.

256

• B.

48

• C.

124

• D.

128

• E.

36

D. 128
Explanation
Large multiplex systems may support up to 128 ports. This means that the system is capable of handling and connecting 128 different devices or channels simultaneously. Multiplexing is a technique used in telecommunications to combine multiple signals into a single transmission medium, thereby optimizing the use of available resources. In the context of this question, a large multiplex system is being referred to, and it is stated that it can support up to 128 ports, indicating its capacity to handle a significant number of connections.

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• 43.

### Indoor hardware is more varied than outdoor hardware.

• A.

True

• B.

False

A. True
Explanation
Indoor hardware refers to the equipment and devices used within buildings or enclosed spaces. This includes a wide range of items such as computers, printers, televisions, and kitchen appliances. On the other hand, outdoor hardware generally consists of items like outdoor lighting, security cameras, and garden tools. The statement suggests that the variety of indoor hardware is greater compared to outdoor hardware, implying that there are more options and types of indoor hardware available in the market.

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• 44.

### Multimode optical fiber is not generally used for campus or building applicaions due to the  inability to use cost-effective transceivers.

• A.

True

• B.

False

B. False
Explanation
Multimode optical fiber is commonly used for campus or building applications because it allows for the use of cost-effective transceivers. This type of fiber can transmit multiple signals simultaneously, making it suitable for short-distance communication within a limited area such as a campus or building. Therefore, the statement that multimode optical fiber is not generally used for campus or building applications due to the inability to use cost-effective transceivers is incorrect.

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• 45.

### Singlemode optical fiber should be considered to support extended distances of high-speed applications.

• A.

True

• B.

False

A. True
Explanation
Singlemode optical fiber should be considered to support extended distances of high-speed applications because it has a smaller core size compared to multimode fiber, allowing for less dispersion and attenuation of the signal. This makes it more suitable for long-distance transmission of high-speed data.

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• 46.

### Optical fiber cable for outdoor use typically contains a water-blocking compound for water resistance as well as well as for allowing some expansion and contraction with temperature changes.  What type of cable is this?

• A.

Tight Buffered

• B.

Loose-Tube

• C.

Singlemode

• D.

Multimode

B. Loose-Tube
Explanation
This type of cable is called a loose-tube cable. It is designed for outdoor use and contains a water-blocking compound to provide water resistance. Additionally, it allows for some expansion and contraction with temperature changes.

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• 47.

### Any direct-baried optical fiber cable also should have a layer of steel armoring for rodent protection.

• A.

True

• B.

False

A. True
Explanation
Steel armoring is necessary for rodent protection in any direct-buried optical fiber cable. Rodents can cause damage to the cable by chewing through it, which can lead to interruptions in the signal transmission. The steel armoring provides a physical barrier that protects the cable from rodent attacks, ensuring the reliability and durability of the cable in underground installations. Therefore, the statement is true.

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• 48.

### When the number of sleeves or the area of the pathway requires more than one row of sleeves, the designers should restrict the number of rows to ________whereever practicable?

• A.

Three

• B.

Four

• C.

Two

• D.

One

C. Two
Explanation
When the number of sleeves or the area of the pathway requires more than one row of sleeves, the designers should restrict the number of rows to two wherever practicable. This is because having more than two rows of sleeves can increase the complexity and cost of installation and maintenance. By limiting the number of rows to two, it allows for easier access and reduces the chances of congestion or interference between the sleeves.

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• 49.

### The size of the pathway using slots should be one slot sized at ________for up to _____________ of usable floor space served by that backbone system?

• A.

.46 m sq (60 in sq)/4000m sq (40000 ft sq)

• B.

.56 m sq (70 in sq)/5000m sq (50000 ft sq)

• C.

.26 m sq (30 in sq)/2000m sq (20000 ft sq)

• D.

.36 m sq (40 in sq)/3000 m sq (30000 ft sq)

A. .46 m sq (60 in sq)/4000m sq (40000 ft sq)
Explanation
The correct answer is .46 m sq (60 in sq)/4000m sq (40000 ft sq). This means that the size of the pathway using slots should be one slot sized at .46 m sq (60 in sq) for up to 4000m sq (40000 ft sq) of usable floor space served by that backbone system.

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• 50.

### The length of the equipment cable used to connect telecommunications equipment directly to the MC (CD) or IC (BD) should not exceed what?

• A.

90m (295 ft)

• B.

30m (98ft)

• C.

5m (16ft)

• D.

10m (33ft)

B. 30m (98ft)
Explanation
The correct answer is 30m (98ft). This is because exceeding this length can result in signal loss and degradation, affecting the quality and reliability of the telecommunications connection. Keeping the cable length within 30m ensures optimal performance and minimizes any potential issues.

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• Mar 21, 2023
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• Feb 28, 2012
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