多项选择题

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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单项选择题

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

单项选择题

A. 225 ft
B. 450 ft
C. 655 ft
D. 900 ft

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