Four jumpers on the digital card can be made to disable channels 5-8 on the AES Output. This is so that a standard 25-pin to 25-pin Pro Tools^TM cable can be used to record channels 1-4 at 192kHz. (Half of the connections on the Digidesign Digital Input are used for receiving and the other half for transmitting.) For more information, consult the relevant section of the Pro Tools^TM User Guide. As shown on the card, with the jumpers in the lower position (on the bottom two pins), outputs 5-8 are enabled. Removing the jumpers and placing them in the upper position (on the top two pins) disables outputs 5-8, as shown: