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19 Cards in this Set
- Front
- Back
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446. What type of tag is placed on bonding conductor used to bond cable sheilds and telecommunications equipment?
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Ground warning tag
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446. Why is the LAN cabling grounded to the TBBC?
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To provide for personnel safety, equipment protection, and noise reduction
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446. What is installed in every intermediate cross-connect room of telecommunications closet to provide grounding for LAN cabling?
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Telecommunications grounding bus bar
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446. Where is the TMGB located?
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In an accessible location within the entrance room
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446. What is the preferred compression-type end connector used for terminating the ground conductor?
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Two hole
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446. How much separation from the mounting surface is required when installing a grounding bus bar?
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2 inches
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446. What are the two catagories of fire-stop systems?
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mechanical and nonmechanical
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446. For what do nonmechanical fire-stop systems provide protection?
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Conduit and cable penetrations through concrete, and masonry, walls or floors; fiber optic cable with an innerduct through a concrete wall or floor, conduit and cable penetrations through gypsum (sheetrock) wallboards
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447. What two reasons support the certification of LAN media?
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First, it identifies and allows you to have cable problems corrected prior to accepting the LAN cables secondly, it provides a guarantee of the cable's transmission characteristics and serviceability
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447. What five tests are accomplished on twisted pairs?
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DC resistance, mutual capacitance, characteristic impedance, attenuation, and NEXT
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447. What are the two tests you are responsible for on UTP and STP media?
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Attenuation and near-end crosstalk
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447. What causes attenuation?
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Electrical characteristics of the wire transmission medium, terminations and cross-connects, and signal reflections caused by impedance mismatches
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447. Why do cable manufactureers perform NEXT tests?
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To classify the cable's performance category
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447. What can be the causes of NEXT on an installed cable?
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Poor cable termination practices or the excessive twisting and bending of the cable during installation
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447. What type of tests are used for a 10Base2 LAN distribution system?
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Characteristic impedance, attenuation, velocity of propagation, edge jitter, and DC loop resistance
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447.When verifying the length of RG-58-series coaxial cables, why do you need to know the composition of the dielectric material used to separate the center conductor from the sheild?
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To obtain the most accurate length measurement
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447. What is the maximum dB loss per kilometer on a singlemode fiber optic backbone cable installed between two buildings?
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0.5 DB
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447. What are the two causes of return loss?
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The quality of the manufactured cable and breaks in the fiber optic cables such as splices and terminations
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446. Describe the conductor used for grounding.
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No. 6 AWG copper conducter with a green outer insulation.
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