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单选题
On an ONS 15454 node you can tunnel an ().
A

SDH circuit over a SONET network delivering it as an SDH signal

B

SDH circuit over a SONET network delivering it as a SONET signal

C

SONET circuit over an SDH network delivering it as an SDH signal

D

SONET circuit over an SDH network delivering it as a SONET signal


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