Fibre Flashcards
What is the regulation for storage of chemicals?
COSHH
What do you do if you discover asbestos?
Stop work seal/lock area where possible and inform site manager
What regulation controls work carried out on highways
NRSWA
What is the hazardous laser classification
BS EN 60825
Si unit for length
Meter
Si unit for time
S- Seconds
Si unit for electric current
Ampere-a
What factor is mega
10⁶ or 1,000,000
How is the current on a dc
The current is constant
What is the equation for refraction index or index of refraction?
Refraction index=speed in vacuum
Speed of light in medium
What does frequency refer to
How often something happens
What is the equation for ohm’s law
How is amplitude measured
From crest to rest
What is attention related to
Distance so if distance is lager so is attention
What is bandwidth measured in
Mega hertz MHz
If bandwidth increases what happens
Distance decreases
If 3 db loss what % of power is lost
What is a ld (laser diode) used for
Single mode
What is a led (light emitting diode) used for
Multi mode
What are the parts of a fibre cable
The core
The cladding
What size is a multi mode core
50um or 62.5um
What is the size of a single mode core
8-10 um core
What is base band
Where 1 signal is being sent along 1 channel
What is broadband
Multiple base band signals
What does 10BASE2/5/T/F Mean
What does 10BASE2/5/T/F Mean
What is the differences between analog and digital signals
What is serial/half duplex
It is the transmission and receiving of a signal but not at the same time
Parallel/full duplex
When signals can be sent and received at the same time like on a phone call
What is dispersion
What is modal dispersion
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
What is chromatic dispersion
In single mode it is the difference in wavelength of the light
What is stepped index
What is graded index
What is graded index
What are the 3 types of testing
Visible light sources (laser)
Loss test set(light scourses and power meter)
Optical time domain reflectomiter(OTDR)
What is the formula for velocity
V=f× wavelength
What is the unit for current?
Amperes
Which is bigger si from list
Giga
What is the relationship between attenuation and distance
Directly proportional
Relationship between bandwidth and distance
Inversely proportional
Which has the highest bandwidth
Om4
What percentage of splices must be 0.3 db or below
100%
What could 10,000,000 bits per second also be known as
10mbps
What area network is used for 3 buildings in 3 different countries?
Wide area Network
How many bits are in a bite
8
Where would you put splices
Splice bridge
Over 2km questions?
3.5×2=7
Where would you do the first gass test
Confined space opening
What did cat 6 cable measured in
Mega bits per second
What is the si unit for temperature
Kelvin
Speed of light in glass
1.5
What type of light is used for telecommunications
Non visible infrared
400 to 750
Visible light
