CM3I uses four 100-pin 0.4 mm pitch Hirose DF40 Series connectors.
It was noticed that the DF40 Series Guideline discourages the use of more than one connector in a single PCB, due to very strict mechanical alignment requirements (x=0 mm, y=0.01mm). Quote: "It is impossible to satisfy this tolerance in consideration of the board and mounting accuracy. Therefore, please avoid the use of more than one set of connector receptacle and plug on single board."
What were the design considerations of putting 4 connectors to CM3I?
Has anyone had any mechanical issues with it thus far?