[Arm-netbook] HDMI v1.4 Audio Return and Ethernet channels
richard.wilbur at gmail.com
Tue Aug 1 06:21:07 BST 2017
I forgot to cite some sources:
Audio Return channel
Claims to be able to carry the signals normally routed over an S/PDIF
cable from the video signal receiver (sink) back to the video signal
Offers up to 100Mb/s bandwidth networking.
HDMI Specification Availability:
"HDMI Specification Ver.1.4b and the Compliance Test Specification
Ver.1.4b (CTS 1.4b), released on October 11, 2011, are available for
download only by Licensed HDMI Adopters." 
"The HDMI Specification Ver. 1.3a is available at no charge. To
download this version of the HDMI specification, please complete the
form that follows.
The HDMI Specification Ver. 1.4a is available to HDMI Adopters via the
Adopter extranet. Adopters can click here to log into the Adopter
Please select which HDMI Adopter agreement is appropriate for your company.
Manufacturers of End Products that will include HDMI:
Ten thousand fixed annual licensing fee plus royalty
Five thousand annual licensing fee plus $1.00 administration fee per
licensed product plus royalty"
I'd love to download the specification but they have it behind a
signed agreement + steep pay wall.
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