Ch. 6 * (Backbone Distribution Systems) Flashcards Preview

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Flashcards in Ch. 6 * (Backbone Distribution Systems) Deck (48)
0

Direct connections between TRs

Allowed if ring/bus

1

One level hierarchial star

Links all bldgs in a campus back to MC (CD)

2

MC should be at ___ of bldgs being served

Center

3

Physical ring

Not double ring

4

Physical ring

Disaster recovery (seldom recommended)

5

TR

Enclosed architectural space

6

TE

Case or housing

7

Most cost-effective transmission mediums

Fiber - data
Copper - voice

8

Ideally, the MC would be in the ___

ER (equipment room)

9

10Gbps @ 984'

OM3

10

Building backbone

22-24 AWG

11

Campus backbone

19-26 AWG

12

Maximum backbone length

2,625'

13

Vertically aligned TRs (stacked closets) advantages:

Accessible backbone cable sheaths
Distributing circuits

14

Slots

1" high curb

15

Sleeves

1" above floor

16

5 sq' of slots serves ___

40,000 sq' of floor space

17

Supporting strands

Heavy backbone cables

18

Supporting strands extend from ___ to ___

Highest floor, basement

19

Insert cable ties every ___ of the strand

1 meter

20

Indoor hardware is ___ varied than outdoor hardware

More

21

Tight buffered

900 µm (indoor)

22

Loose tube

250 µm (outdoor)

23

Non conductive fiber backbone bend radius

10 X under no load
15 X when being pulled

24

Conductive fiber backbone bend radius

10 X under no load
20 X when being pulled

25

Pre-connectorized patch cords

Fast
Cost isn't the concern

26

Fiber pigtail cable

Factory connectorized on one end
Unterminated on the other end

27

Double star topology

Hierarchial

28

Backbone star topology

No more than 2 cross connects

29

Connections between any two HCs

No more than 3 cross connects

30

Multimode fiber is more common due to ___

Cost-effective transceivers

31

Most common application for fiber

Multiplexing

32

At least ___ cable ties should be used per floor on support strands

3

33

Steel strands

.25"

34

Open shafts

Okay

35

Elevator shafts

Avoid

36

Qty of 4" sleeves per bldg

4
(add 1 if over 40,000 sq')

37

OS2 length @ 10 Gbps

32,800'

38

Depth of backbone slots

6" - 24"

39

OS1 length @ 10 Gbps

6560'

40

What type of fiber is rated for 1 Gbps at 984'?

OM2

41

Second level Crossconnect is between ___ & ___

HC & IC

42

Fiber strength member

Aramid yarn
Fiberglass rod
Steel rod

43

Type of link from MC to IC

Can be either:
-interbuilding
-intrabuilding

44

OM2 length @ 1 Gbps

984'

45

First level crossconnect

Between MC & IC

46

Used to secure large, heavy backbone cables

Toggle bolts
Masonry
Straps

47

Two key parameters when selecting fiber electronics

Attenuation and bandwidth