单选题What is the effect of turning on all available downstream carrier tones in a DMT DSL transmissionsystems？（）ADownstream RS error correction effectiveness is reducedBThe downstream line rate and throughput remains unchanged， but FEC efficiency is reducedCThe upstream DSL bandwidth is reduced， since less carriers become available for upstream trafficDThe downstream DSL bandwidth is increased
单选题
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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