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单选题
What approximates the signal attenuation of a plasterboard wall？（）
A
Crowd of people
B
Office window
C
Metal door
D
Brick wall
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Given the formula： （Fiber Attenuation * Km） + （Splice Attenuation * # of Splices） + （Connector Attenuation * # of Connectors） + （Optical Fiber or OADM） + Buffer（Fiber aging）） With regard to SONET/SDH optical calculations， what will the given formula provide？（）A、 fiber lossB、 OSNR levelC、 post amplificationD、 index of reflectionE、 index of refractionF、 power post amplification budget
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By how much is a signal’s strength reduced when the signal passes through an object thatintroduces 3 dB of attenuation？（）A、1/6B、1/4C、1/3D、1/2
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单选题What is the correct relative switching priority in a BLSR ring (higher to lower)?（）A
signal fail, signal degrade, manual switchB
signal degrade, signal fail, manual switchC
protection lockout, manual switch, path AISD
forced switch, manual switch, signal degradeE
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单选题In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（）A
the signal to noise of the current optical amplifierB
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the signal to noise introduced by the optical multiplexerD
the accumulated noise to signal ratio of the optical channel
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单选题What is the phenomenon called where different wavelengths of light travel at different speeds？（）A
OSNRB
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单选题Given the formula: (Fiber Attenuation * Km) + (Splice Attenuation * # of Splices) + (Connector Attenuation * # of Connectors) + (Optical Fiber or OADM) + Buffer(Fiber aging)) With regard to SONET/SDH optical calculations, what will the given formula provide?（）A
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单选题What is one thing you should be aware of when conducting a wireless site survey？（）A
5 GHz equipment will not be able to penetrate through walls as well as 2.4 GHZ equipment.B
2.4 GHz equipment will not be able to penetrate through walls as well as 5 GHz equipment.C
Mounting antennas near metal objects will slightly amplify the signal.D
When determining coverage， you should begin measuring attenuation from the middle of the room.
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单选题By how much is a signal’s strength reduced when the signal passes through an object thatintroduces 3 dB of attenuation？（）A
1/6B
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the signal to noise of the current optical amplifierB
the signal to noise of the previous amplifier or sourceC
the signal to noise introduced by the optical multiplexerD
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fiber lossB
OSNR levelC
post amplificationD
index of reflectionE
index of refractionF
power post amplification budget
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