Week 6 Chapter 3 - Pages 3-1 to 3-53 Flashcards
Augmented Class F balanced twisted-pair has performance characteristics specified up to _____ MHz
a. 500
b. 600
c. 1000
d. 2000
c. 1000
EPONs, dispersion unshifted fiber
a. G.652
b. G.653
c. G.655
d. G.656
e. G.657
a. G.652
p 4-20 Table 4.2
Supports 1 Gigabit Ethernet, 10 Gigabit Ethernet and SONET.
EPONs, dispersion shifted fiber
a. G.652
b. G.653
c. G.655
d. G.656
e. G.657
b. G.653
p 4-20 Table 4.2
Supports STM-64 and SDH systems with an unequal channel spacing in the 1550 nm wavelength region
EPONs, non-zero dispersion shifted fiber
a. G.652
b. G.653
c. G.655
d. G.656
e. G.657
c. G.655
p 4-20 Table 4.2
Primarily utilized in submarine and long-haul terrestrial applications.
EPONs, wideband non-zero dispersion shifted fiber
a. G.652
b. G.653
c. G.655
d. G.656
e. G.657
d. G.656
p 4-21 Table 4.2
Used in within a pair of bounding both CWDM and DWDM systems.
EPONs, bending loss insensitive fiber.
a. G.652
b. G.653
c. G.655
d. G.656
e. G.657
e. G.657
p 4-21 Table 4.2
Supports small volume fiber management systems and low radius mounting.
Within backbone applications, a PON is typically a point-to-multipoint, fiber to the premises network architecture, in which unpowered optical splitters are used to enable a single fiber to serve multiple premises, typically ___ to ___
a. 12, 48
b. 32, 128
c. 64, 128
d. 128, 256
b. 32, 128
p 4-18
A PON configuration reduces the amount of optical fiber and CO equipment required, compared with PTP architectures.
The aggregation device, called the OLT, supports a minimum of ___ subscribers per port by means of a passive optical splitter.
a. 12
b. 14
c. 16
d. 20
c. 16
p 4-18
The EFM objective to support EPONs is based on a number of economic advantages. The aggregation device, called the OLT, supports a minimum of 16 subscribers per port by means of a passive optical splitter.
In a multiple hierarchical level campus backbone design, one or more _____ serve more than one building.
a. Intermediate cross-connects
b. Main cross-connects
c. Campus distributors
d. Horizontal cross-connects
a. Intermediate cross-connects
p 4-25
Larger campus cabling systems may require multiple hierarchical levels. This design provides a campus backbone that uses selected ICs (BDs) to serve a number of buildings (e.g., the science buildings in Figure 4.16) rather than linking all the buildings directly to the MC (CD). The ICs (BDs) are then linked to the MC (CD).
When designing an in-building backbone distribution system using slots, the slot area sizing should be increased by _____ with each 3716 m2 (40,000 ft 2) increase in useable floor space served.
a. 0.008 m2 (12 in2)
b. 0.016 m2 (24 in2)
a. 0.008 m2 (12 in2)
p 4-46
The size of the pathway using slots should be one slot sized at ≈0.04 m2 (60 in2) for up to ≈3716 m2 (40,000 ft2) of usable floor space served by that backbone distribution system. The slot area should be increased by ≈0.008 m2 (12 in2) with each ≈3716 m2 (40,000 ft2) increase in usable floor space served by that backbone.
When planning space for terminations, the ITS designer should plan for a clear space of ___ inches above and below the connecting hardware for cable handling.
a. 5
b. 6
c. 8
d. 12
a. 5
p 3-14
The ICT distribution designer should plan for:
• A minimum clear space of ≈127 mm (5 in) above and below the top and bottom of the connecting hardware for cable management.
• Additional rack, cabinet, enclosure, or backboard space for routing cables, patch cords, equipment cords, or cross-connect jumpers (cables may also be routed behind the connecting hardware).
When designing the layout of a telecommunications room, if an entrance facility is housed at the same location, then the designer should:
a. Include space for cabling protection, grounding (earthing), enclosures, and splice cases
b. Allow additional space for cross-connect components
c. Include space for splicing and ladder racking
d. Provide clear separation and identification of each tenant’s equipment and terminations
a. Include space for cabling protection, grounding (earthing), enclosures, and splice cases
p 3-22 Table 3.4
The placement of cross-connect fields, patch panels, and active equipment in the horizontal cross-connect (floor distributor) should allow for the total length of patch cords, equipment cords, or jumpers plus the work area equipment cord to not exceed ___ per channel.
a. 5 m (16.5 ft)
b. 10 m (33 ft)
c. 15 m (49.5 ft)
d. 20 m (66 ft)
b. 10 m (33 ft)
p 3-14
≈10 m (33 ft) total for patch cords/jumpers, equipment cords connected to the HC (FD), plus the work area equipment cord.
≈5 m (16.5 ft) for patch cords, equipment cords, or jumpers in the HC (FD).
≈20 m (66 ft) for patch cords or jumpers that serve MC (CD) or IC (BD).
The recommended height for racks, cabinets, or enclosures is:
a. 2.1 m (7 ft)
b. 2.3 m (7.5 ft)
c. 2.4 m (8 ft)
d. 2.6 m (8.5 ft)
a. 2.1 m (7 ft)
p 3-14
Racks, cabinets, or enclosures are recommended to have a height of ≈2.1 m (7 ft) and have a rail size and top flange width of ≈483 mm (19 in) (see Figure 3.1).
When planning space for wall terminations, do not mount termination hardware closer than _____ to any corner.
a. 76 mm (3 in)
b. 102 mm (4 in)
c. 127 mm (5 in)
d. 152 mm (6 in)
d. 152 mm (6 in)
p 3-14
To allow access, do not mount termination hardware closer than ≈152 mm (6 in) to any corner.
What type of cabling facility is typically housed in a telecommunications enclosure (TE)?
a. Main or zone cross-connect
b. Intermediate or main cross-connect
c. Horizontal cross-connect
d. Horizontal or zone cross-connect
c. Horizontal cross-connect
p 3-19
TEs typically serve a relatively small number of users on a floor, and as such, the type of cabling facility that may be housed in TEs is typically limited to HCs (FDs).
When allocating space for cable terminations, up to _____ percent more space may be required for the routing of cables and cords to and from the cross-connect fields.
a. 10
b. 15
c. 20
d. 25
c. 20
p 3-12
These space allocations do not include cable runs to and from the cross-connect fields. Up to 20 percent more space may be required for proper routing of cables, jumpers, equipment cords, and patch cords.
The HVAC system serving a telecommunications space should maintain a positive pressure in the space, with a minimum of _____ air change(s) per hour.
a. One
b. Two
c. Three
d. Four
a. One
p 3-6
Maintain a positive pressure with a minimum of one air change per hour in the telecommunications space.
On equipment racks using angled patch panels, the use of _____ cable management is recommended.
a. Vertical
b. Horizontal
a. Vertical
p 3-16
When placing equipment rack, a vertical cable management panel should be placed on at least one side of the rack or between the rack and the room wall.
The recommended height for racks, cabinets, or enclosures is:
a. 2.1 m (7 ft)
b. 2.3 m (7.5 ft)
c. 2.4 m (8 ft)
d. 2.6 m (8.5 ft)
a. 2.1 m (7 ft)
p 3-14
Racks, cabinets, or enclosures are recommended to have a height of ≈2.1 m (7 ft) and have a rail size and top flange width of ≈483 mm (19 in) (see Figure 3.1).
If there are fewer than _____ work areas, the equipment room (ER) shall be no less than 15 m2 (160 ft2) in size.
a. 50
b. 100
c. 150
d. 200
d. 200
p 3-39
If there are fewer than 200 work areas, the ER shall be no less than ≈15 m2 (160 ft2). For special-use buildings (e.g., hospitals, hotels), ER size requirements may vary
If there are multiple telecommunications spaces on the same floor, they shall be interconnected with a minimum of _____ conduit(s) (or another type of pathway with equivalent capacity).
a. One 78 mm (3 trade size)
b. Two 78 mm (3 trade size)
c. One 103 mm (4 trade size)
d. Two 103 mm (4 trade size)
d. Two 103 mm (4 trade size)
p 3-4
Multiple telecommunications spaces on the same floor shall be interconnected with a minimum of two ≈103 mm (4 trade size) conduits or a pathway that provides equivalent capacity.
If the minimum sizing guidelines for telecommunications spaces cannot be met, a space 2.6 m (8.5 ft) high, 1.83 m (6 ft) wide, and 1.2 m (4 ft) deep should be provided for every _____ 4-pair cable terminations served.
a. 120
b. 240
c. 360
d. 480
b. 240
p 3-11
If, for reasons beyond the control of the ICT distribution designer, the minimum size guidelines cannot be met, ≈1.2 m (4 ft) depth by ≈1.83 m (6 ft) width by ≈2.6 m (8.5 ft) height (inside dimensions) of the telecommunications space should be provided with sliding or double ≈914 mm (36 in) doors for every 240, 4-pair cable terminations served.
If a separate access provider (AP) space is required in or adjacent to the entrance facility, a space of at least _____ should be allocated by the designer for each AP.
a. 0.91 m x 1.83 m (3 ft x 6 ft)
b. 0.91 m x 2.1 m (3 ft x 7 ft)
c. 1.2 m x 1.83 m (4 ft x 6 ft)
d. 1.2 m x 2.4 m (4 ft x 8 ft)
c. 1.2 m x 1.83 m (4 ft x 6 ft)
p 3-33
If a separate AP space is required, it should be in or adjacent to the EF and may require a mesh partition or locked cabinet. A space of at least ≈1.2 m by ≈1.83 m (4 ft by 6 ft) should be allocated for each AP (see Figure 3.7).