What is the difference between the Type A and Type B on the Viavi 40G Certifier MPO reference cables?
Type A or B refers to the pin alignment. On Type A, pin 1 at one end goes to pin 1 at the other and then 2 to 2 ,etc. On Type B, the connections are opposite at each end. Pin 1 goes to pin 12, 2 to 11, etc.