单项选择题

The ML-series Ethernet card on the ONS 15454 provides up to （）active Q-in-Q instances per card.

A.255
B.512
C.1024
D.4096

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单项选择题

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

单项选择题

You are provisioning a DS-1 circuit on an ONS 15454 2F-BLSR with a XC-10G card. Each VT1.5 connection must also terminate via the STS matrix. On the originating circuit node, how many STS ports are now available for VT1.5 circuits?（）

A.2
B.3
C.4
D.20
E.22
F.24

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