Chapter 20 - Residential Cabling

Question 1

How many grades of residential cabling are there?

Answer 1

Two grades. Grade 1 and Grade 2.
Grade 1 provides Cat 5e cabling, (Cat 6 recommended), and 75-Ohm series-6 coax cable. All else optional
Grade 2 provides Cat 5e cabling, (cat 6 recommended), 75-ohm series-6 coax cable, and security cabling. all else optional

Question 2

Where is the demarcation point usually located for residential?

Answer 2

Outside of an exterior building wall

Question 3

What are the recommended backbone cables for residential?

Answer 3

• 100 ohm balanced twisted pair
• multimode optical fiber
• singlemode optical fiber
• trunk, feeder, and distribution coaxial cable

Question 4

What are the topologies that should be used for residential cabling?

Answer 4

• star topology for balanced twisted-pair cabling
• star, bus or star and bus topology for coax backbone
• star or ring topology for optical fiber cabling

Question 5

What is the auxiliary disconnect outlet (ADO)?

Answer 5

ADO provides the means for the tenant to disconnect from an Access Provider (AP) and provides terminations for connection to the premises cabling

Question 6

How should the auxiliary disconnect outlet (ADO) be designed?

Answer 6

The ADO should have:

• minimum of 8 balanced twisted-pairs
• minimum of 2 coax cables
• 4 optical fiber strands

Question 7

What is a distribution device (DD) for residential cabling?

Answer 7

The DD is a facility used for the termination and connection of outlet cables, DD cords, equipment cords and sometimes ADO cables.
The ADO and DD are usually colocated and can be combined into a single unit.
Provide access to the building electrical ground within ~1.52m (5ft) of the DD and in accordance with applicable code.

Question 8

How much wall space should be allocated for the Distribution Device (DD) in Grade 1 residential cabling?

Answer 8

1-8 outlets: 14.35in W x (10 to 18in) high
9-16 outlets: 14.35in W x (28 to 36in) high
17-24 outlets: 14.35in W x (28 to 42in) high
More than 24 outlets: 14.35in W x (28 to 42in) high

Question 9

How much wall space should be allocated for Distribution Device (DD) in a grade 2 residential cabling?

Answer 9

1-8 outlets: 14.35in W x (18 to 36in) high
9-16 outlets: 14.35in W x (28 to 42in) high
17-24 outlets: 14.35in W x (28 to 42in) high
More than 24 outlets: 14.35in W x (28 to 42in) high

Question 10

What is the common equipment room (CER)?

Answer 10

CER may be colocated with the EF, it may be used to house active equipment. The CER may house the terminations of the Demarcation Point, Auxiliary Disconnect Outlet cable, and backbone cable

Question 11

What is the equipment room (ER)?

Answer 11

The ER may house the Entrance Facility (EF), Common Equipment Room (CER) and a Common Telecommunications Room (CTR). Typically houses more equipment than a CTR and has different space requirements. An ER requires other support facilities.

Question 12

What is a Common Telecommunications Room (CTR)?

Answer 12

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

Question 13

What is the minimum size of the space for a Common Telecommunications Room (CTR)?

Answer 13

Grade 1
Minimum Space for first 5 tenants: 14.5in W x 24in H
Minimum additional space per tenant unit: 50in2

Grade 2
Minimum Space for first 5 tenants: 30.5in W x 24in H
Minimum additional space per tenant unit: 100in2