A.Absorption loss

B.Reflection Loss

C.Scatter loss

D.Bending loss

A.PTN box device requires daily database backup

B.Hardware alarms should be cleared in time

C.PTN7900 requires cleaning the dust filter once a year

D.PTN cartridges are recommended to be backed up at least once a week

A.OCH

B.OTU

C.OMS

D.OTS

A.After the logical fiber connection is completed, no path search operation is required, and the OTS path and OMS path can automatically generate the

B.When the OCh service path exists, directly create the ODUk path, and the network management can automatically create the OTUk path

C.When the OCh service path exists, create the Client path directly, and the NMS can automatically create the OTUk and ODUk paths

D.When there is an OCh service path, you can first search for the OTUK path, create the ODUk service layer path, and then create the Client path

A.Users can plan their own private network VLAN ID

B.Provide a simpler L3VPN solution

C.Solve the problem of increasingly scarce public network VLAN ID resources

D.Make the user network more independent