Anritsu MP2110A BERTWave - Page 366

Chapter 7 Performance Test
7-44.
9. Connect the output connector of the variable optical attenuator
and the Data In connector of the 26G/53Gbaud CRU, using a
single-mode optical fiber. Refer to Figure 7.3.5-3.
10. Check that the Lock Status indicator turns green (Lock) within
40 seconds.