多项选择题
Click the Exhibit button. Within an ONS 15454, you are provisioning a circuit on an unprotected UPSR ring. In the exhibit, which two must you configure?（） (Choose two.)
A. revertive B. circuit type C. circuit size D. bidirectional E. protected drops F. switch on PDI-P
单项选择题 You are installing a Cisco ONS 15454 in a service provider site. A DS3 cable is to be connected to a digital cross-connect system. What is the maximum distance allowed between the two?（）
