Solution:

Because PCL-844 rev. 1.1 PCB has been phased out, we used Rev. 2.0 PCB for new PCL-844 production. In fact, rev. 2.0 PCB is for PCL-844H. But after modify clock source and some chips, PCL-844 with rev. 2.0 PCB has exactly the same specification of the old PCL-844 with rev. 1.1 PCB. So please ignore the PCB revision difference.