单项选择题
A Channel ID mismatch occurs when （）.
A. fibers are terminated incorrectly on a node
B. the channel number in the received K1 byte is not identical to the channel number transmitted in the K2 byte
C. the channel number in the received C1 byte is not identical to the channel number transmitted in the C2 byte
D. the channel number in the received C2 byte is not identical to the channel number transmitted in the C1 byte
E. the channel number in the received K2 byte is not identical to the channel number transmitted in the K1 byte
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The ML-series Ethernet card on the ONS 15454 provides up to （）active Q-in-Q instances per card.
A.255
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C.1024
D.4096 -
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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
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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
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F.24
