Ch. 6 - Backbone Distribution Systems.csv Flashcards Preview

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Flashcards in Ch. 6 - Backbone Distribution Systems.csv Deck (54):
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)

32

Total length between network connections in a backbone = ___________

328'
(6-23)

33

Vertically aligned TR's advantages =

backbone sheath is accesible on each floor
(6-25)

34

Cable sleeves or slots should be positioned _________

adjacent to a wall but not above or below the termination field.
(6-25)

35

Construct all slots with a __________ and sleeves to extend ___________.

1" high curb & 1" above the floor
(6-25)

36

The quantity of pathways using 4" conduits or sleeves, should be four sleeves or conduits plus one additional sleeve or conduit per _____ of usable floor space.

40,0000 ft²
(6-26)

37

Conduit size & quantity entering an ER

(4) 4" conduits + spare per 40,000 ft² of floor space
(ex: 50,000 ft² = (5) 4" conduits)
(6-27)

38

Slots are typically located _______ against the wall within a space and __________ in depth.

flush & 6-24"
(test)
(6-27)

39

The size of the pathway using slots should be ______ for up to ___________.

one slot
40,000 ft²
(6-27)

40

Open cable shafts ok to use? Elevator shafts ok to use?

Yes
No
(6-28)

41

Where large, heavy copper cables are used (e.g., ________), clamp cable to strand between highest floor & basement.

1200-pair copper
(6-29)

42

Steel strand =

0.87"
(test)
(6-29)

43

Secure strand ______, number of strand ties ______

before tensioning, 3.28' w/ a min. of 3 per floor
(test)
(6-29)

44

The most common application for fiber backbone cabling is ____________.

multiplexed transmission
(6-33)

45

Indoor hardware is more ____________ than outdoor.

varied
(6-34)

46

Fiber for outdoor use =

loose-tube & 250 microns
(6-39)

47

Fiber tubes are assembled w/ strength members consisting of:

Fiberglass rods
Steel rods
Aramid yarn
Covered w/ polyethylene jacket
(6-39)

48

Advantages of using optical fiber:

immune to mother nature (lightning)
No bonding requirement
Immune to EMI
No crosstalk
(6-40)

49

**Bend radius for non-conductive backbone fiber:

10 times the OD w/ no load
15 times the OD when being pulled (load)
(test)
(6-42)

50

**Bend radius for conductive backbone fiber:

10 time the OD w/ no load
20 times the OD when being pulled (load)
(test)
(6-42)

51

The two major categories of field splicing methods for fiber are:

Fusion
Mechanical
(6-45)

52

Three basic methods to terminate fiber:

Pigtail splicing
Field connectorizing
Installation of pre-connectorized assembilies
(6-45)

53

What cable is factory connectorized at one end?

Pigtail
(6-47)

54

Bending an optical fiber tighter than the min. bend radius may result in:

Microfractures
Fiber breakage
Increased attenuation

55

**Campus backbone color?

Brown
(on Sept. test)
(6-4)