Question 1

You are reviewing a building backbone design with a vertically aligned telecommunications room (TR). In the spec you note in a footnote with details that the slots at one end of the telecommunications room (TR) must be flush with the floor and the sleeves provide at the end of the telecommunications room (TR) must also be flush. In your meeting with the electrical engineering firm that has provided the spec, you make the comment that according to best practices, the MINIMUM that slots and sleeves must extend above the finished floor are:

Accepted Answer

The answer of You are reviewing a building backbone design...

Question 2

You have been asked to design a backbone cable connecting two large campus buildings. Your pathways will include using conduits, maintenance holes, and one section of 100 m (328 ft) of direct buried optical fiber cable. Your choice of fiber optic cable type recommendation is a:

Accepted Answer

As the 100 m section of the cable is direct buried, it is important to choose a cable that is designed for direct burial applications. A loose tube cable containing a water blocking compound would be the best choice as it will protect the fiber optic cable from moisture and water damage. The use of conduits and maintenance holes will further protect the cable, but having the additional protection of a water blocking compound will ensure the longevity of the cable.

Question 3

You have been asked to project manage a fiber cable backbone installation. In the course of the installation, you notice the fiber cable with a 25 mm (1 in) outside diameter is being installed into a small TR, and the cable is being installed into a tight corner. Based on your knowledge of minimum bend radius requirements for fiber cable, you must ensure that the MINIMUM cable bend radius of _______________ is provided when the cable installation is completed.

Accepted Answer

The minimum bend radius for a fiber cable with a 25 mm (1 in) outside diameter is 254 mm (10 in).

Question 4

When reviewing a backbone distribution system within a building provided to you for standards compliance, you see that there are several cables with bridge taps built in. Which one of the following options is correct?

Accepted Answer

Bridge taps cause impedance mismatches and can lead to signal reflections and serious crosstalk issues. Removing them will ensure standards compliance and improve the overall performance of the backbone distribution system. Simply ensuring cable lengths meet maximum or exceed minimum requirements may not solve the underlying problem of bridge taps. Removing one bridge tap per cable may not be sufficient if there are multiple bridge taps on a single cable. Doing nothing poses a risk for future network problems.

Question 5

Rack mounted hardware is installed in two standard sized racks or cabinets. Those sizes are:

Accepted Answer

The standard sizes for rack-mounted hardware are 482 mm (19 inches) and 584 mm (23 inches).

Question 6

When designing a fiber backbone using cable with an armored sheath, a major consideration that you must address is:

Accepted Answer

When using fiber cables with an armored sheath, it is crucial to properly bond and ground the sheath to prevent electrical interference and potential safety hazards. Therefore, the best choice is E, bonding and grounding of the armored sheath. The other options such as the type of metal used, strength of the sheath, and amount of rust-reducing materials are also important considerations, but not as critical as ensuring proper bonding and grounding.

Question 7

The decision regarding the number of optical fibers to install (fiber strand count) in a backbone depends largely on all of the following EXCEPT:

Accepted Answer

The distance between telecommunications rooms (TRs) is not a determining factor in the number of fiber strands needed in a backbone. Factors such as the level of multiplexing, intended end-user applications, physical topology of the cabling system, and cabling system configuration are all important considerations when deciding on the number of fiber strands to install.

Question 8

Optical fiber all-dielectric cables have an additional advantage over ones containing a steel strength member. That advantage is:

Accepted Answer

All-dielectric cables do not contain any metal, making them non-conductive and thus more resistant to lightning and electrical conduction compared to cables with a steel strength member.

Question 9

The maximum vertical rise is the distance over which the cable is vertically self-supporting. This distance is a function of the weight of the cable and the:

Accepted Answer

The maximum vertical rise is determined by the weight of the cable and the cable's maximum tensile rating. A cable with a higher tensile rating can support its own weight over a greater distance, allowing for a higher maximum vertical rise. The other options listed (sheath fire rating, number of strands of fiber, type of hangers, and type of fire stop) do not directly affect the maximum vertical rise of the cable.

Question 10

In reviewing your client's network needs for today and 5 years into the future, you note their current specs call for a 1Gb/s network within a campus environment, with little or no possibility of any increased bandwidth demands until they move to their planned future site. The building is not large, and the cable lengths will not exceed 550 m (1804 ft). Your recommendation for the fiber to be installed in the backbone is:

Accepted Answer

Since there is no need for high bandwidth, the cost-effective solution of OM2 fiber is sufficient for the network needs. OM1 fiber has a shorter reach and lower bandwidth capacity while OM3 fiber is more expensive and better suited for higher bandwidth demands. OS1 fiber with attenuators is not recommended for a campus environment with short cable lengths.

Question 11

When designing a campus distribution system involving small buildings with only one horizontal cross-connect (HC) [Floor distributor (FD)] per building, you can eliminate the need for a(n):

Accepted Answer

In a small building with only one horizontal cross-connect per building, the intermediate cross-connect (IC) or building distributor (BD) is unnecessary, as there is no need for additional distribution points between the main cross-connect and the horizontal cross-connect.

Question 12

When designing a connection to an outlying building you decide to choose a physical ring. Your primary reason for considering a physical ring is:

Accepted Answer

The primary reason for considering a physical ring is that it provides a redundant cable path for disaster recovery. This means that if there is a cable break, the network can still function by using the alternate path. This is especially important for outlying buildings where it may take longer to access and repair the cable. The other options (A, B, C, and D) may be factors to consider, but the primary reason for choosing a physical ring is redundancy for disaster recovery.

Question 13

You are given a choice of methods of routing backbone cabling vertically through a building. The one option that you do NOT want to use is:

Accepted Answer

Elevator shafts should not be used for routing backbone cabling due to safety concerns and potential interference with elevator operations.

Question 14

When installing a heavy backbone cabling vertically, recommended methods of securing the cable include all of the following EXCEPT:

Accepted Answer

Tie wraps are not recommended for securing heavy backbone cabling vertically as they may not provide sufficient support and can damage the cable.

Question 15

Multimode optical fiber is generally used for campus or building applications due to the ability to use cost effective:

Accepted Answer

Multimode optical fiber is often used in campus or building applications because it allows for the use of cost-effective transceivers, which are less expensive than those required for single-mode fiber.

Question 16

One of the advantages of using optical fiber in the backbone installation is:

Accepted Answer

Optical fiber is immune to electromagnetic interference (EMI) compared to copper-based cables. This makes it a better choice for backbone installations where there is likely to be a high level of electrical activity.

Question 17

Exhibit:  This diagram illustrates an example of a:

Accepted Answer

The diagram shows multiple hierarchical levels in the campus backbone design, with a core layer, distribution layer and access layer. This is a well-designed campus backbone network.

Question 18

An installation crew is pulling an optical fiber cable into a riser. The cable has an outside diameter of 25 mm (1 in). As the cable is being pulled off the reel and through a pulley into the riser, you must verify that the minimum bend radius for the cable being pulled is observed. The pulley must be sized at a MINIMUM of:

Accepted Answer

The answer of An installation crew is pulling an optical...

Question 19

Exhibit:  This diagram illustrates a ______________campus backbone design.

Accepted Answer

The diagram shows a hierarchical star design, with a core layer connecting to distribution layers, which in turn connect to access layers. This is a common design for a campus network backbone, providing scalability and flexibility.

Question 20

A backbone star topology shall have no more than______ level(s) of cross-connections.

Accepted Answer

The answer of A backbone star topology shall have no...

Exam 1: BICSI Registered Communications Distribution Designer - RCDD