... by a letter denoting the shell size (A=15 pin, B=25 pin, C=37 pin, D=50 pin, E=9 pin), followed ... photograph below, the connector on the left is a 9-pin male (DE-9M) connector plug, and the ... is a 25-pin female (DB-25F) socket. The hexagonal pillars at either end of each connector have a threaded stud ... it to the metal panel. They also have a threaded hole that receives the jackscrews on the cable shell ...