Ch. 6 - Backbone Distribution Systems.csv Flashcards Preview

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2

Where is the main cross-connect (MC)/campus distributor (CD) typically located?

Equipment rooms (ER)
(6-1)

3

Where is an intermediate cross-connect (IC)/building distributor (BD) typically located?

Equipment Room (ER)
(6-1)

4

*Campus systems containing small buildings with only one HC per bldg, thereby eliminating the need for an ____.

IC
(test)
(6-3)

5

*A backbone star topolgy shall have no more than_______

two levels of cross connections
(6-4)

6

Connections between any two HC's shall not pass through more than______

three cross connections
(6-4)

7

The termination field color for a second level intrabuilding backbone is:

Gray
(6-4)

8

Direct connections TR's are allowed if the backbone distribution system is expected to meet the requirements for a __________ or ________.

bus topology or ring topology configuration.
(test)
(6-7)

9

A design for a one-level hierarchical star campus backbone would

link all of the buildings to the MC.
(6-8)

10

MC is ideally located

at the center of the building being served.
(6-9)

11

A 1-level hierarchical star interbuilding (campus) backbone topology:

Provides increased flexibility
Allows reconfiguration of applications from the MD (CD)
Simplifies the addition of future campus backbones
(6-9)

12

Selected IC's to serve a number of buildings rather than all direct to the MC.

Multiple hierachical level
(figure 6.7)
(6-9)

13

*Connecting outlying buildings in a physical ring is _________ recommended.

seldom
(test)
(6-11)

14

The primary reason for considering a physical ring backbone topology is:

as a redundant path
(6-11)

15

*TR =

Architectual space
(test)
(6-13)

16

TE =

Case or housing
(6-13)

17

_________ align TR's in multi-story buildings whenever possible.

Vertically
(6-13)

18

How many MCs (CDs) are permitted in a building cabling system?

Only one
(6-19)

19

Cost effective medium for data is ________, for voice is ________

fiber, copper (balanced twisted pair)
(6-19)

20

Ideally, the MC would be co-located in the _____.

ER
(6-19)

21

Length & Data Rates: Campus backbones (OM1 fiber)

1.2 mi & 155 Mb/s
(table 6.2)
(6-22)

22

Length & Data Rates: Campus backbones (OM2 fiber)

1,804' & 1 Gb/s
(table 6.2)
(6-22)

23

Length & Data Rates: Building backbones (OM2 fiber)

984' & 1 Gb/s
(table 6.2)
(6-22)

24

The max campus/building backbone length recommended for OM2 fiber (data rates up to 1Gb/s) is:

1,804
(6-22)

25

Length & Data Rates: Campus/Building backbones (OS1 fiber)

6,560' & 10 Gb/s
(table 6.2)
(6-22)

26

The max campus/building backbone length recommended for OS2 fiber (data rates up to 10Gb/s) is:

32,800 ft (6 mi)
(6-22)

27

Recommended multimode fiber cable

62.5/125 um & 50/125 um
(6-23)

28

Singlemode fiber wavelengths

1310 & 1550
(6-23)

29

Recommended copper size for building backbones:

24-22 AWG round, solid copper
(6-23)

30

Recommended copper sizes for campus backbones:

19 AWG & 26 AWG
(6-23)

31

Backbone cable length for voice systems

2,625'
(6-23)