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If you're extending runs to serial devices, be sure you have the best cables for the job - BLACK BOX DB9 Serial Extension Cables. These cables feature molded hoods and thumbscrews that enable a snug fit when making connections, and the hoods provide protection for the pins. All nine pins are wired straight through, and the conductors are 26 AWG. Mylar shielding protects communications from EMI/RFI.