Chapter 20 - Residential Cabling

Question 1

Optical fiber ADO cable should accommodate a minimum of ___ strands per living unit.

a. 1
b. 2
c. 4
d. 6

Answer 1

c. 4

p 20-6

Optical fiber ADO cable should:
• Use multimode, singlemode, or both types of cable.
• Accommodate a minimum of four strands per living unit to provide for:
––Telephone lines.
––Data.
––CATV.
––Security.
––Multimedia service

Question 2

To provide for future growth, equip the DD to add ___ to ___ percent more cable runs than the original installed number of runs.

a. 10 to 15
b. 15 to 25
c. 20 to 50
d. 30 to 55

Answer 2

c. 20 to 50

p 20-7

Many DDs are sized to fit within the stud spacing in a wall ≈368 mm (14.5 in) and may be as tall as ≈1370 mm (54 in)

Question 3

A residential unit with 20 outlets/connectors, grade 2 requires enclosure heights of ___

a. 18” to 36”
b. 28” to 42”
c. Multiple 28” to 36”
d. Multiple 28” to 42”

Answer 3

d. Multiple 28” to 42”

p 20-7 Table 20.2

Question 4

A residential unit with 10 outlets/connectors, grade 2 requires enclosure heights of ___

a. 18” to 36”
b. 28” to 42”
c. Multiple 28” to 36”
d. Multiple 28” to 42”

Answer 4

b. 28” to 42”

p 20-7 Table 20.2

Question 5

Access to the building electrical ground shall be provided within ___ ft of the conductive cable terminations in the EF in accordance with applicable codes.

a. 2
b. 3
c. 4
d. 5

Answer 5

d. 5

p 20-10

Question 6

___ testing of the cabling shall be performed to ensure proper end-to-end connectivity.

a. Qualification
b. Verification

Answer 6

b. Verification

p 20-24

Coaxial cable shall be verified to ensure continuity.
Twisted-pair cabling test shall include:
• Wire map.
• Length.
• Continuity to the remote end.
• Shorts between any two or more conductors.
• Crossed pairs.
• Reversed pairs.
• Split pairs.
• Any other miswiring

Question 7

___ of voice and data cabling is preferred over ___ testing during the trimout stage of cabling.

a. Qualification, verification
b. Verification, qualification

Answer 7

a. Qualification, verification

p 20-24

Cable qualification tests the cabling to determine that certain network technologies (e.g., 1000BASE-T, 100BASE-T, Firewire™) will perform on the cabling system. Cable qualification shall be performed using network equipment installed on the cabling or by use of a qualification test instrument.

Question 8

Certification may be used in lieu of verification testing or cable qualification testing of data cabling during the trim-out stage of cabling.

a. True
b. False

Answer 8

a. True

p 20-24

Certification may be used in lieu of verification testing or cable qualification testing of data cabling during the trim-out stage of cabling.

Question 9

Certification testing, when implemented, should be done in the ___ configuration.

a. Horizontal link
b. Channel link
c. Permanent link
d. Top down

Answer 9

c. Permanent link

p 20-24

Certification tests the cabling to all performance criteria of a category of cable. Certification testing, when implemented, should be done in the permanent link configuration.

Question 10

The permanent link refers to the permanent part of the cabling installed from the ___ to the outlet and the connectors.

a. ADO
b. DD
c. CTR
d. NID

Answer 10

b. DD

p 20-24

The permanent link refers to the permanent part of the cabling installed (e.g., cable up to ≈90 m [295 ft] from the DD to the outlet and the connectors) without patch cords installed on each end of the cable.

Question 11

When providing a label within the DD denoting each cable run, identify each cable run by room and length.

a. True
b. False

Answer 11

b. False

p 20-25

At a minimum, provide a label within the DD denoting each cable run. Identify each cable run by room and wall locations.

For example, B1-N could denote a telecommunications outlet/connector on the north wall of bedroom one.

Question 12

When designing a residential telecommunications cabling system for a multi-dwelling unit, a common telecommunications room (CTR) should be located on:

a. Every second floor, or every third floor
b. Each floor, or every third floor
c. Each floor, or every second floor

Answer 12

b. Each floor, or every third floor

p 20-11

The CTR is the space where backbone and ADO cables terminate. A CTR should be located on each floor, or every third floor, thus serving the floor it is on and the floors above and below.

Note, similar to Chapter 8 - backbone bonding conductor (BBC) - the BBC be installed on the top floor of a building and on every third floor between the ground floor and top floor of the building.

Question 13

With residential cabling, optical fiber backbone cabling may be implemented in a _____ topology.

a. Ring or bus
b. Bus or star
c. Star or ring

Answer 13

c. Star or ring

p 20-5

Optical fiber cabling may be implemented in a star or ring topology

A star topology should be implemented for balanced twisted-pair cabling. Coaxial backbone cable may be implemented using a star, bus, or star and bus topoloy

Question 14

In residential cabling, an optical fiber auxiliary disconnect outlet (ADO) cable should accommodate a minimum of _____ strands per living unit.

a. Four
b. Three
c. Two

Answer 14

a. Four

p20-6

Accommodate a minimum of four strands per living unit to provide for:
––Telephone lines.
––Data.
––CATV.
––Security.
––Multimedia service