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Fibre > Fibre > Flashcards

Fibre Flashcards

1
Q

What is the regulation for storage of chemicals?

A

COSHH

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2
Q

What do you do if you discover asbestos?

A

Stop work seal/lock area where possible and inform site manager

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3
Q

What regulation controls work carried out on highways

A

NRSWA

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4
Q

What is the hazardous laser classification

A

BS EN 60825

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5
Q

Si unit for length

A

Meter

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6
Q

Si unit for time

A

S- Seconds

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7
Q

Si unit for electric current

A

Ampere-a

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8
Q

What factor is mega

A

10⁶ or 1,000,000

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9
Q

How is the current on a dc

A

The current is constant

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10
Q

What is the equation for refraction index or index of refraction?

A

Refraction index=speed in vacuum
Speed of light in medium

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11
Q

What does frequency refer to

A

How often something happens

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12
Q

What is the equation for ohm’s law

A
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13
Q

How is amplitude measured

A

From crest to rest

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14
Q

What is attention related to

A

Distance so if distance is lager so is attention

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15
Q

What is bandwidth measured in

A

Mega hertz MHz

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16
Q

If bandwidth increases what happens

A

Distance decreases

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17
Q

If 3 db loss what % of power is lost

A
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18
Q

What is a ld (laser diode) used for

A

Single mode

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19
Q

What is a led (light emitting diode) used for

A

Multi mode

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20
Q

What are the parts of a fibre cable

A

The core
The cladding

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21
Q

What size is a multi mode core

A

50um or 62.5um

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22
Q

What is the size of a single mode core

A

8-10 um core

23
Q

What is base band

A

Where 1 signal is being sent along 1 channel

24
Q

What is broadband

A

Multiple base band signals

25
Q

What does 10BASE2/5/T/F Mean

A
26
Q

What does 10BASE2/5/T/F Mean

A
27
Q

What is the differences between analog and digital signals

A
28
Q

What is serial/half duplex

A

It is the transmission and receiving of a signal but not at the same time

29
Q

Parallel/full duplex

A

When signals can be sent and received at the same time like on a phone call

30
Q

What is dispersion

A
31
Q

What is modal dispersion

A

Modal dispersion is only in multi node fibres is where different rays travel in different modes of propagation having different path lengths.as distance and frequency increase the likelihood increases

32
Q

What is chromatic dispersion

A

In single mode it is the difference in wavelength of the light

33
Q

What is stepped index

A
34
Q

What is graded index

A
35
Q

What is graded index

A
36
Q

What are the 3 types of testing

A

Visible light sources (laser)
Loss test set(light scourses and power meter)
Optical time domain reflectomiter(OTDR)

37
Q

What is the formula for velocity

A

V=f× wavelength

38
Q

What is the unit for current?

A

Amperes

39
Q

Which is bigger si from list

A

Giga

40
Q

What is the relationship between attenuation and distance

A

Directly proportional

41
Q

Relationship between bandwidth and distance

A

Inversely proportional

42
Q

Which has the highest bandwidth

A

Om4

43
Q

What percentage of splices must be 0.3 db or below

A

100%

44
Q

What could 10,000,000 bits per second also be known as

A

10mbps

45
Q

What area network is used for 3 buildings in 3 different countries?

A

Wide area Network

46
Q

How many bits are in a bite

A

8

47
Q

Where would you put splices

A

Splice bridge

48
Q

Over 2km questions?

A

3.5×2=7

49
Q

Where would you do the first gass test

A

Confined space opening

50
Q

What did cat 6 cable measured in

A

Mega bits per second

51
Q

What is the si unit for temperature

A

Kelvin

52
Q

Speed of light in glass

A

1.5

53
Q

What type of light is used for telecommunications

A

Non visible infrared

54
Q

400 to 750

A

Visible light

Fibre (1 decks)

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