單項選擇題

The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. 
What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（）

A. none
B. -600 ps/nm
C. -200 ps/nm
D. +200 ps/nm
E. +600 ps/nm


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3.多項選擇題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