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單項(xiàng)選擇題

For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？（）

A. 0.4 nanometers
B. 0.6 nanometers
C. 0.8 nanometers
D. 1.2 nanometers
E. 1.6 nanometers

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多項(xiàng)選擇題

Click the Exhibit button. Within an ONS 15454， you are provisioning a circuit on an unprotected SNCP ring. In the exhibit，
which two must you configure？（）

A. revertive
B. circuit size
C. circuit type
D. bidirectional
E. protected drops
F. Switch on PDI-P

多項(xiàng)選擇題

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

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

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