Ch. 6 * (Backbone Distribution Systems)

Question 0

One level hierarchial star

Answer 0

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

Question 1

Direct connections between TRs

Answer 1

Allowed if ring/bus

Question 2

MC should be at ___ of bldgs being served

Answer 2

Center

Question 3

Physical ring

Answer 3

Not double ring

Question 4

Physical ring

Answer 4

Disaster recovery (seldom recommended)

Question 5

TR

Answer 5

Enclosed architectural space

Question 6

TE

Answer 6

Case or housing

Question 7

Most cost-effective transmission mediums

Answer 7

Fiber - data

Copper - voice

Question 8

Ideally, the MC would be in the ___

Answer 8

ER (equipment room)

Question 9

10Gbps @ 984’

Answer 9

OM3

Question 10

Building backbone

Answer 10

22-24 AWG

Question 11

Campus backbone

Answer 11

19-26 AWG

Question 12

Maximum backbone length

Answer 12

2,625’

Question 13

Vertically aligned TRs (stacked closets) advantages:

Answer 13

Accessible backbone cable sheaths

Distributing circuits

Question 14

Slots

Answer 14

1” high curb

Question 15

Sleeves

Answer 15

1” above floor

Question 16

5 sq’ of slots serves ___

Answer 16

40,000 sq’ of floor space

Question 17

Supporting strands

Answer 17

Heavy backbone cables

Question 18

Supporting strands extend from ___ to ___

Answer 18

Highest floor, basement

Question 19

Insert cable ties every ___ of the strand

Answer 19

1 meter

Question 20

Indoor hardware is ___ varied than outdoor hardware

Answer 20

More

Question 21

Tight buffered

Answer 21

900 µm (indoor)

Question 22

Loose tube

Answer 22

250 µm (outdoor)

Question 23

Non conductive fiber backbone bend radius

Answer 23

10 X under no load

15 X when being pulled

Question 24

Conductive fiber backbone bend radius

Answer 24

10 X under no load

20 X when being pulled

Question 25

Pre-connectorized patch cords

Answer 25

Fast

Cost isn’t the concern

Question 26

Fiber pigtail cable

Answer 26

Factory connectorized on one end

Unterminated on the other end

Question 27

Double star topology

Answer 27

Hierarchial

Question 28

Backbone star topology

Answer 28

No more than 2 cross connects

Question 29

Connections between any two HCs

Answer 29

No more than 3 cross connects

Question 30

Multimode fiber is more common due to ___

Answer 30

Cost-effective transceivers

Question 31

Most common application for fiber

Answer 31

Multiplexing

Question 32

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

Answer 32

3

Question 33

Steel strands

Answer 33

.25”

Question 34

Open shafts

Answer 34

Okay

Question 35

Elevator shafts

Answer 35

Avoid

Question 36

Qty of 4” sleeves per bldg

Answer 36

4

add 1 if over 40,000 sq’

Question 37

OS2 length @ 10 Gbps

Answer 37

32,800’

Question 38

Depth of backbone slots

Answer 38

6” - 24”

Question 39

OS1 length @ 10 Gbps

Answer 39

6560’

Question 40

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

Answer 40

OM2

Question 41

Second level Crossconnect is between ___ & ___

Answer 41

HC & IC

Question 42

Fiber strength member

Answer 42

Aramid yarn
Fiberglass rod
Steel rod

Question 43

Type of link from MC to IC

Answer 43

Can be either:

• interbuilding
• intrabuilding

Question 44

OM2 length @ 1 Gbps

Answer 44

984’

Question 45

First level crossconnect

Answer 45

Between MC & IC

Question 46

Used to secure large, heavy backbone cables

Answer 46

Toggle bolts
Masonry
Straps

Question 47

Two key parameters when selecting fiber electronics

Answer 47

Attenuation and bandwidth