Connects any serial modem with DB25 to PC DB9 serial port. Interchangeable mounting allows you to replace the thumbscrews with included stand-off screws and can be mounted on a face plate. This cable has matched impedance, PVC jacket, molded ends with thumbscrews and inner hood soldered 360 degrees to the connector for complete end to end shielding. Pin-Out: 1-8 / 2-3 / 3-2 / 4-20 / 5-7 / 6-6 / 7-4 / 8-5 / 9-22.