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Detroit Packing Co. RJ11 6P4C to 4 Wire RJ45 8P8C Male Plug Lead Cable Phone Cord for Landline Telephone (2m (~6 feet), One-Pack, Black)
This cable does not magically convert phoneline ADSL to ethernet. This cable uses the center 4 wires on the 8-wire ethernet cable. The leftmost and rightmost two wires are unused in this cable. RJ11 6P4C to RJ45 8P8C Conector. One end is RJ11 6P4C port, the other other end is RJ45 8P8C. This cable is for if you want to have your digital phone line signal from your modem travel over Ethernet cables. You’ll need these cables, plus

Price is $4.00
Price: $3.75