单选题Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing? ()A DUSB line timingC loop timingD internal timingE through timing
单选题
Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing? ()
A
DUS
B
line timing
C
loop timing
D
internal timing
E
through timing
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解析:
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