This one piece cable is used for connecting your computer’s serial port to the RJ45 console port on most Cisco equipment. This rollover console cable has an RJ45 connector on one end and a DB9 serial connector on the other end. To use the cable you will connect the RJ45 connector to your equipment and the DB9 connector to the serial port on your computer. This is the new style cable that replaces the old style “console kit” (rollover cable & adaptor). This cable is compatible with most Cisco equipment with an RJ45 style console port. If your equipment has a DB25 console port you will need the 4 piece console kit.