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The adapter need one pairs to work it. It can't transfer rj45 ethernet to HDMI port.(no networking function)
It only can transfer HDMI singal by RJ45 cable.
RJ45 to HDMI 1.4 Extender Over Single 60m Ethernet LAN RJ45 CAT5E CAT6 For HDTV 1080P With 3D
no need extral power.
This kind of HDMI extender by CAT-5e/6 used single patch cable to extend the HDTV displays up to 30 meters fo 1080p.
it not only breaks the limitation of the HDMI cable transmission length.
It is designed to convert HDMI signal to standard TCP/IP and transmit by internet cable or Lan.
With the advantage of TCP/IP standard, it can transmit HDMI signal source from HD STB,DVD,PS3,HDMI display card etc to HD projector, DLP,LCD,LED and other audio visual equipments.
These HDMI Extenders can handle any resolution up to 1080p at up to 100 Feet.
Extenders by Lan connection,
Cable length requirement is as follows: Cat5e/cat6 30m to the max between 2 devices;
