單項(xiàng)選擇題What is the effect of turning on all available downstream carrier tones in a DMT DSL transmissionsystems?()

A.Downstream RS error correction effectiveness is reduced
B.The downstream line rate and throughput remains unchanged, but FEC efficiency is reduced
C.The upstream DSL bandwidth is reduced, since less carriers become available for upstream traffic
D.The downstream DSL bandwidth is increased


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D.None ofthe above

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4.單項(xiàng)選擇題How many content definitions does CSG allow?()

A.40
B.400
C.4000
D.40000

5.單項(xiàng)選擇題What is the function of the AJB bits on DS1 using Extended Super Frame (ESF)?()

A.It is used for signaling on-hook and off-hook status
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