I need a recommendation for IR extension to work with Cisco Explorer 9865HDC High Definition DVR Receiver. I tried a dual band 38-56KHz IR extension with 3.5mm jack into port #7 (IR Port), but does not work. Cox CAble supplied the DVR but will not help with recommendation of IR extension cable as they "do not support remote extenders". Surely someone has run into this problem before? My DVR is inside a closet with other AV equipment and I have no line of sight from TV viewing area.