A.True

B.False

A.Wear an ESD-preventive wrist strap or gloves to prevent static electricity from damaging the board.

B.CLASS 1M means low optical power, no damage to eyes or skin

C.Regularly clean the air filter to facilitate heat dissipation

D.Equipment needs safety grounding

A.TRUE

B.FALSE

A.Enhanced subrack can only be configured with UXCT+USXM or UXCT+USXH

B.XCT+SXM can be used together to provide an ODUK crossover with a total capacity of 2.56 Tbit/s.

C.XCT+SXM can support ODU0, 1, 2, and 3 levels of crossover.

D.XCT+SXM can be regarded as a whole when working. If any faulty, the two boards will be switched together.

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

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

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