Amazon.com: AV Access HDBaseT DisplayPort KVM Extender, Zero Latency, 4k@30Hz/1080P@120Hz DP 1.2 PoE Extender with 2 USB 2.0 Ports for Keyboard and Mouse, EDID, PoE Function, Over Single Cat5e/6/6a/7 Up to 330ft :
KVXLCDP-100 - KVX Series KVM Extender Kit over CATx - 4K, Single-Monitor, DisplayPort, USB 2.0 Hub, Serial, Audio, Local Video
DisplayPort to HDMI over Cat6 Extender Kit, 4K 60Hz, 230 ft. | Eaton
Amazon.com: Cable Matters DisplayPort to DisplayPort Extension Cable (DP to DP Extension Cable) 3 Feet : Electronics
Light-Link Display Port Cable | DisplayPort over Fiber — Sewell Direct
Globalmediapro SCT DP02U 4K DisplayPort KVM with USB/RS232 CAT5e HDBaseT Extender (Transmitter and Receiver)