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單項(xiàng)選擇題

With R4.0， how many total DCC-R tunnel connections can each ONS 15454 support using the TCC+ card？（）

A. 10
B. 32
C. 64
D. 84
E. 96

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單項(xiàng)選擇題

Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references？（）

A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing

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