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質問 # 26
In an optical fiber, the light is transmitted through the \_\_\_\_\_\_\_\_\_\_.
- A. Cladding
- B. Core
- C. Jacket
- D. Buffer
正解:B
質問 # 27
Multiple Response: Identify one or more choices that best complete the statement or answer the question.
Multimode transceivers use \_\_\_\_\_\_\_\_\_\_ sources depending on their requirements for coupled power and bandwidth.
- A. F-P lasers
- B. DFB lasers
- C. LED
- D. VCSEL
正解:C、D
質問 # 28
A crimp-on connector like the Cat 5e/Cat 6 connector is also called a \_\_\_\_\_\_\_\_ connector.
- A. Solderless
- B. Insulation-displacement
- C. USOC
- D. Clipper
正解:B
質問 # 29
What is the MINIMUM lighting requirement for telecommunications spaces?
- A. 200 lux (18.6 foot-candles) of lighting in the horizontal plane and 500 lux (46 foot-candles) of lighting in the vertical plane measured at 1 meter (3.28 feet) above the finished floor
- B. 500 lux (46 foot-candles) of lighting in the horizontal plane and 500 lux (46 foot-candles) of lighting in the vertical plane measured at 1 meter (3.28 feet) above the finished floor
- C. 50 lux (4.6 foot-candles) of lighting in the horizontal plane and 20 lux (1.9 foot-candles) of lighting in the vertical plane measured at 1 meter (3.28 feet) above the finished floor
- D. 500 lux (46 foot-candles) of lighting in the horizontal plane and 200 lux (18.6 foot-candles) of lighting in the vertical plane measured at 1 meter (3.28 feet) above the finished floor
正解:D
質問 # 30
10 dB corresponds to a factor of \_\_\_\_\_\_\_\_\_\_ in power.
- A. 0
- B. 1
- C. 2
- D. 3
正解:A
質問 # 31
Premise cables in LAN backbones may contain \_\_\_\_\_\_\_\_\_\_.
- A. Only singlemode fiber
- B. Both multimode and singlemode fiber
- C. Plastic optical fiber
- D. Only multimode fiber
正解:B
質問 # 32
What is a passive optical network (PON)?
- A. A point-to-point network architecture in which unpowered optical splitters are used to enable a single optical fiber strand to serve multiple end-points.
- B. A point-to-multipoint network architecture in which powered optical splitters are used to enable a single optical fiber strand to serve multiple end-points.
- C. A point-to-multipoint network architecture in which unpowered optical splitters are used to enable a single optical fiber strand to serve multiple end-points.
- D. A point-to-point network architecture in which powered optical splitters are used to enable a single optical fiber strand to serve multiple end-points.
正解:C
質問 # 33
\_\_\_\_\_\_\_\_\_\_ is the standard which forms the basis of structured cabling in the US?
- A. NEMA 63.1999
- B. EIA/TIA TR42
- C. IEEE 802.3
- D. EIA/TIA 568
正解:D
質問 # 34
Information on the safety of chemicals used in fiber optics are __________.
- A. In MSDS sheets supplied by manufacturers
- B. Required to be in every installer's tool kit
- C. Available from National Institutes of Health
- D. Rarely useful
正解:A
質問 # 35
What is a RJ-45 connector?
- A. A special high frequency connector
- B. The connector used only with Cat 5e/6 jacks
- C. A trade name
- D. A modular 8 pin connector with USOC pinout
正解:D
質問 # 36
Copper networks can be converted to fiber optics using \_\_\_\_\_\_\_\_\_\_.
- A. Media converters
- B. Fiber hubs
- C. Rewiring
- D. Patch panels
正解:A
質問 # 37
Category 6A cable is specified and must be tested during certification to \_\_\_ MHz.
- A. 0
- B. 1
- C. 2
- D. 3
正解:A
質問 # 38
What is the maximum length of a permanently installed UTP cabling link allowed in structured cabling standards?
- A. 90 meters
- B. Depends on the electronics running on the link
- C. 100 feet
- D. 100 meters
正解:A
質問 # 39
The principle of operation of OTDRs is similar to \_\_\_\_\_\_\_.
- A. Lenses
- B. Radar
- C. Mirrors
- D. Power meters and sources
正解:B
質問 # 40
Structured cabling standards call for a maximum length of UTP cable for data of \_\_\_\_\_\_\_\_\_\_.
- A. 100 meters
- B. 300 meters
- C. 800 meters
- D. 90 meters
正解:A
質問 # 41
The difference between the termination schemes of T568A and T568B is ______?
- A. Keying on plugs and jacks
- B. Determined by the speed of the network
- C. Reversal of pairs 2 and 3
- D. Reversal of tip and ring
正解:C
質問 # 42
Most \_\_\_\_\_\_\_\_\_ are designed to allow easy pulling.
- A. Ropes
- B. Cable trays
- C. Cables
- D. Cable boxes
正解:D
質問 # 43
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