The 1.27mm 2x8 Cable with Female Header is used to connect SO Connection Adaptor for EM100Pro & EM100Pro-G2 or SO16W Connection Adaptor for BBF to 1.27mm 2x8 SMT male header soldered on board.
The cable is only 6.5cm long to minimize signal degradation.
The Red line on the cable indicates the location of Pin 1.