Place your serial printer or modem wherever you want to with a multipurpose, economical DB25 extension. Extend existing serial or parallel cables...to connect through a switchbox or buffer.or to connect to a modem. Remember that all 25 lines connect straight through pin-to-pin, and each cable is foil shielded for EMI/RFI protection. They are available in a variety of lengths and gender combinations. Stock lengths are available fully molded with thumbscrew connectors to provide you with a quick and easy connection each time.