题目内容
(请给出正确答案)
[单选题]
On ZXCTN equipment, C-POS board is to(), whereas channelized board is to().
A.map downstream service E1 signal to STM-1 signal; map downstream service FE signal to STM-1 signal
B.map downstream service FE signal to STM-1 signal; map downstream service E1 signal to STM-1 signal
C.map downstream service E1 signal to FE signal; map downstream service FE signal to STM-1 signal
D.map downstream service FE signal to STM-1 signal; map downstream service FE signal to STM-1 signal
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