Octava Inc., specialists in HDMI distribution equipment, announced the release of a HDMI to Ethernet Extender. The HDMI Ethernet converter enables transmission of 1080P HD HDMI digital video and audio ...

Most HDMI cables you'll use in a home theater or computer setup will just transfer audio and video, but there are ones that can also transmit Ethernet.

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Some (many?) HDMI cables can also carry Ethernet over HDMI. The main use seems to be to provide internet connection to a smart TV from a cable modem box. Currently I have an ethernet-USB adaptor ...