多项选择题

Which three timing modes are supported on the ONS 15454 shelf? （）(Choose three.)

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

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单项选择题

Click the Exhibit button. A customer has several interconnected core rings (see exhibit). They want to create several irtual rings?utilizing their OC-192 backbone (nodes 1,2,3,4). What should you recommend?（）

A. PPMN with BLSR rings
B. PPMN with UPSR rings
C. 1:N protection on all core circuits
D. multi-ring interconnect with BLSR rings

单项选择题

With R4.0, how many total DCC 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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