A.AU-PTR refers to the location of the J0 byte.

B.The root cause of the AU pointer adjustment is that the clocks between the upstream and downstream stations are not synchronized.

C.Since the value of the AU-PTR pointer is placed in the last 10 bits of the two bytes H1 and H2, the valid value is 0~1023.

D.If the receiving end detects that the H1H2 byte is all "1", the local end generates an AU-AIS alarm.

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

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

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

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

A.FALSE

B.TRUE

A.FALSE

B.TRUE

A.Optical transmission section overhead

B.Optical channel overhead

C.Optical multiplex section overhead

D.Optical channel transmission unit overhead