This custom plug to HDMI female and RJ-45 female plugs cable is used as an extension when connecting a codec to camera.
Cisco camera extension cable is rated 4.0 out of 5 by 1.
Rated 4 out of 5 by BWTech from Better choice than longer cable but has one flaw.I prefer the use of this splitter cable in case someone damages the cable on the camera end which allows a standard HDMI to be used as a replacement. It should have been the case with the RJ45 cable as well except the splitter uses the same pins for transmit and receive as the camera not allowing a standard straight through patch cord to be used. You'll need to make or special order a RJ45 patch cord that is straight through except for pins 3 and 6 need to be crossed. Otherwise good quality and it works.