Chapter 4 - Backbone Distribution Systems

Question 1

Sleeve used for backbone distribution should be located a minimum of ____ from adjacent sleeves.

Answer 1

1in

Question 2

Ideally, the Main Crossconnect (MC) (Campus Distributer (CD)) would be co-located in the:

Answer 2

Equipment Room (ER)

Question 3

In a backbone distribution system, connections between any two floor distributors shall not pass through more than ___ cross-connection(s).

Answer 3

Three

Question 4

A backbone distribution shall not have more than ___ levels of cross connections.

Answer 4

Two

Question 5

What color identifies the first level of interbuilding backbone?

Answer 5

Brown
This is the backbone going from the main cross connect of one building to the the horizontal cross connect of another building

Question 6

What color identifies the first level intrabuilding backbone? (intrabuilding refers to within the same building)

Answer 6

White
First level intrabuilding backbone refers to backbone going from Main cross connect to Intermediate Cross Connect or Horizontal Cross Connect.

Question 7

What color identifies the second level intrabuilding backbone?

Answer 7

Gray

Second level intrabuilding backbone refers to backbone going from Intermediate Crossconnect to Horizontal Cross connect

Question 8

In Ethernet over digital subscriber line (EoDSL) networks, 2Mb/s service (2PASS-TL) can be provided to subscribers over a maximum span of ____ using balanced twisted pair cable.

Answer 8

8858ft

Question 9

In Ethernet over digital subscriber line (EoDSL) networks, 10Mb/s service (10PASS-T) can be provided to subscribers over a maximum span of ____ using balanced twisted pair cable.

Answer 9

2461 ft

Question 10

Sleeves used for backbone distribution should be constructed to extend a minimum of __ and a maximum of ___ above the floor level.

Answer 10

Minimum of 1in

Max of 3in

Question 11

A minimum of ___ sleeves are required for floor to floor backbone distribution with an addition one sleeve per ____.

Answer 11

4 sleeves

additional sleeve per 40,000 sq ft

Question 12

A typical floor slot for backbone distribution should have a minimum depth of ___ and a minimum length of ____.

Answer 12

Minimum depth of 6in

Minimum length of 10in

Question 13

A typical floor slot for backbone distribution should have a maximum depth of ___ .

Answer 13

24in

Question 14

Slots used for backbone distribution should be sized at ___ per 40,000 sq ft and increased by ___ per additional 40,000sq ft of usable space.

Answer 14

60 in sq per 40,000 sq ft

increased by 12 in sq per additional 40,000 sq ft

Question 15

The maximum balanced twisted-pair backbone length for voice systems should not exceed:

Answer 15

2625ft

Also, total length between network equipment connections should not be greater than 328ft.

Question 16

What are the advantages of using a star topology for the campus backbone cabling?

Answer 16

• Provides centralized facilities administration
• Allows testing and reconfiguration of the systems topology and applications from the MC (CD)
• Allows easy maintenance and security against unauthorized access
• Provides increased flexibility
• Allows the easy addition of future campus backbones

Question 17

What are the disadvantages of using a star topology campus backbone?

Answer 17

• Introduces single points of failure

- Increases cost

Question 18

RMC conduit thread protectors are color coded ____, ____, and ____ based on trade size.

Answer 18

Blue For (1,2,3,4,5, and 6 trade size)
Black for (1/2, 1-1/2, 2-1/2, and 3-1/2 trade size)
Red for (3/4, and 1-1/4 trade size)

Question 19

IMC conduit thread protectors are color coded ___, ___ , and ___ depending on trade size.

Answer 19

Orange (for 1, 2, 3 and 4 trade sizes)
Yellow (for 1/2, 1-1/2, 2-1/2, and 3-1/2 trade sizes)
Green (for 3/4 and 1-1/4 trade sizes)

Question 20

Ethernet in the First Mile (EFM) is also known as Ethernet to the last mile, describes the access network from the the access point to the subscriber’s premise. What is the purpose of EFM?

Answer 20

The purpose of EFM and its distinction from traditional Ethernet networks is to specify the functionality required for the subscriber access network.