A.UNI, NNI

B.NNI, UNI

C.NN, NNI

D.UNI, UNI

A.The number of OTU boards or tributary boards connected in series for the whole channel error test is recommended to be no more than 13

B.To ensure the smooth passage of all channel services across the entire network, a 10-minute error prediction is required for each single channel.

C.The duration of the full channel error test is 20 hours. If the error occurs within 20 hours, it needs to be retested for 20 hours after troubleshooting.

D.When the single channel error test is performed, the remote end needs to perform hardware loopback on the tributary board client side.

A.ODUk SNCP protection

B.Customer side 1+1 protection

C.1+1 protection inside the board

D.Optical line protection

A.FALSE

B.TRUE

A.In-board 1+1 protection can be applied to chain networking and ring networking.

B.Set the OTU as the detection unit, and the electrical layer alarms such as OTUk_LOF and OTUK_LOM will also trigger the switching.

C.For OSN 1800 devices, you can use the OTU with dual-selection to protect your business.

D.The 1+1 protection on the board can protect the OTU board.